Date   
Propagation Charts for March #elmer

Dennis - WU6X
 

Attached is the latest propagation prediction charts for March, downloaded from ARRL: http://www.arrl.org/propagation

These are handy for estimating the time/frequency for the best chance of communicating from where you are to somewhere else on the globe. I've found them useful at times and, in any case, a good subject of conversation when you paper the wall with them?
73,
Dennis - WU6X

Re: NVIS Propagation #antennas #elmer #emcomm

Orion, AI6JB
 

Thank you Dennis, Jef, et al., for sharing NVIS!

 

73

Orion Endres, AI6JB

1201 Wood Oak Court, Roseville, CA 95747-7383

(916) 788-8251 H \\ (916) 534-8251 C

 

What the heck does “73” mean?  73 is morse code short hand for “Best Regards” used by Ham radio operators.  It’s origin goes all the way back to the landline telegraph days.

 

 

From: sfarc@w6ek.groups.io <sfarc@w6ek.groups.io> On Behalf Of Jef - N5JEF
Sent: Tuesday, March 03, 2020 09:57
To: sfarc@w6ek.groups.io; Dennis Gregory (WU6X) <wu6x@...>
Subject: Re: [from W6EK Groups.io] NVIS Propagation

 

A couple more attachments for anyone interested.  These provide a more rigorous discussion of NVIS in general, and antenna height in particular.  Short story on antenna height:  A horizontal antenna between 1/8 and 1/4 wave above ground will do well for NVIS.  1/4 wave is best for transmit, 1/8 wave is slightly better for receive.  Anything lower will certainly sound quieter, but you will lose both ERP and S/N.  Worth noting that 1/4 wave at 40 meters is roughly 1/8 wave at 80 meters, so an antenna about 25-30 feet above ground is an excellent solution for both bands.

 

- Jef

 

On Tue, Mar 3, 2020 at 8:41 AM Dennis - WU6X <wu6x@...> wrote:

I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

Re: NVIS Propagation #antennas #elmer #emcomm

Gary - KC3PO
 

I absolutely agree that #NVIS is and should be a topic of its own. I got my first ham ticket in 0-land... Colorado... and we did a lot of NVIS out there due to the challenges with terrain. Our ARES group had a mobile 2m repeater in a trailer, but we were often stymied re: getting it into a decent position in many of the remote areas we operated.

- Gary

On Tue, Mar 3, 2020 at 10:23 AM Jef - N5JEF <jef@...> wrote:
Dennis -

I am pleased but surprised by your email and your interest in NVIS at this time. Two years ago, on February 21, 2018, I had requested and argued that #NVIS be one of our group keywords and was denied on the basis of it being "just an antenna technique".

As you might know, my primary interest in ham radio is NVIS because it can provide robust, reliable, regional communications without relying on external infrastructure. 

Attached is a presentation that I prepared and have given as an introduction and overview of NVIS.

- Jef  N5JEF

On Tue, Mar 3, 2020 at 8:41 AM Dennis - WU6X <wu6x@...> wrote:
I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

Re: NVIS Propagation #antennas #elmer #emcomm

Gerry - WA6E
 

What is a BTN antenna?


On 3/3/2020 8:41 AM, Dennis - WU6X wrote:
I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

Re: NVIS Propagation #antennas #elmer #emcomm

Jef - N5JEF
 

A couple more attachments for anyone interested.  These provide a more rigorous discussion of NVIS in general, and antenna height in particular.  Short story on antenna height:  A horizontal antenna between 1/8 and 1/4 wave above ground will do well for NVIS.  1/4 wave is best for transmit, 1/8 wave is slightly better for receive.  Anything lower will certainly sound quieter, but you will lose both ERP and S/N.  Worth noting that 1/4 wave at 40 meters is roughly 1/8 wave at 80 meters, so an antenna about 25-30 feet above ground is an excellent solution for both bands.

- Jef

On Tue, Mar 3, 2020 at 8:41 AM Dennis - WU6X <wu6x@...> wrote:
I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

Re: NVIS Propagation #antennas #elmer #emcomm

Jef - N5JEF
 

Dennis -

I am pleased but surprised by your email and your interest in NVIS at this time. Two years ago, on February 21, 2018, I had requested and argued that #NVIS be one of our group keywords and was denied on the basis of it being "just an antenna technique".

As you might know, my primary interest in ham radio is NVIS because it can provide robust, reliable, regional communications without relying on external infrastructure. 

Attached is a presentation that I prepared and have given as an introduction and overview of NVIS.

- Jef  N5JEF


On Tue, Mar 3, 2020 at 8:41 AM Dennis - WU6X <wu6x@...> wrote:
I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

NVIS Propagation #antennas #elmer #emcomm

Dennis - WU6X
 

I haven't paid much attention to NVIS propagation in the past, but now with the BTN antenna I have up, just 6 feet off the ground, I found a few things to be very interesting, and confirmed by this blurb from Idaho ARES:

NVIS propagation is used to fill in between the distance that is normally covered by ground wave and the first hop for low angle of radiation long distance communication. This typically falls between 50 miles and 600 miles.

NVIS is often compared to pointing a shower head straight up at the ceiling and having the water droplets fall everywhere. Counter to most HF antenna installations, NVIS requires a high angle of radiation. This is achieved by installing the antenna at a low height, usually no higher than 1/8 wavelength. Lower antenna heights result in only a slight reduction in received signals and it is not atypical for a portable installation to have the antenna installed just a few feet above the ground.

NVIS does not require a high transmit power level. Power levels of 25 watts are quite effective in maintaining good quality HF communications.

NVIS requires using a frequency that is below the Critical Frequency, the highest frequency at which NVIS communications can operate at, but above the frequency at which the D-Layer absorption results in excessive attenuation, or the Lowest Usable Frequency (LUF). NVIS communications is not possible below the LUF or above the Critical Frequency. Use of frequencies below the LUF or above the Critical Frequency will result in a loss of NVIS communications.

For all practical purposes, NVIS communications at Idaho latitudes rarely are usable at frequencies above 13 MHz as the Critical Frequency rarely climbs above this level.

NVIS HF Propagation is in daily use by United States Military Forces and government emergency agencies at all levels of government on a daily basis. The reason is that it works very reliably.

I'm finding much of this to be very true and very interesting. There are some good points to note and remember as pointed out in this note.

Dennis - WU6X

W6SFM CW Beginners Course Starts April 8th #elmer #morsecode

SFMARC W6SFM
 

Hello Club members. The W6SFM encourages everyone to become an active CW operator for both Emergency communications when all else fails, and just for the fun of it. With that said;

The SFM ARC would like to announce that we will once again be running our 10 week CW for beginners course.  This course will be 10 weeks long held once a week for 2 hours (7PM until 9PM-ish) each Wednesday evening in Carmichael.  If you, your club members, or someone you know are interested in taking our CW class we encourage you to sign up NOW.  This class is made available to EVERYONE that wants to take it.  They do NOT need to be a licensed operator to join our class.  We have locked a start date for the class, we will begin Wednesday evening April 8th (Ending June. 10th) Just in time for ARRL Field Day!

Everyone can benefit from this course! For those with no Morse Code knowledge this is an excellent course where you or your friends will be taught the complete International Morse Code alphabet, numbers, pro-signs, how to adjust and send on a Morse Code straight key and more interesting general information than one brain can store!  The goal of our course is to have all students up to speed around week 6, and on the air! This is also a great opportunity for those of you who may have already taken our course before.  This class offers a chance for returning students to brush up on their code, increase their speed, build on-air confidence and get a better understanding of the 'pro-signs' that CW radio ops use on-air.

The CW class is $50 for new members, and only $20 for returning members who bring their previously supplied Morse Key and Oscillator.  As always, as a new student you will receive a FREE Morse Code straight key and a Code Oscillator to keep at the completion of the course. These items are worth more than $50 by themselves.

Now for the important part... This is a FIRST COME FIRST SERVE COURSE! We will Limit the amount of students who are able to take this course. Therefore it is very important that you make your payment AS SOON AS POSSIBLE to secure your seat in this class.  We do not take walk-ins at the door.
To make payment by check you must FIRST send an email to admin@... to indicate that you are interested and you are going to make your payment. We will hold your seat for 7 days from your email while we await your payment to come:

If you prefer, and we do, you may also pay via PayPal, Debit or Credit Card. PayPal and CC payments will be charged an extra $2.00 for credit card processing fees. If you would like to make your payment this way please click on the following link to be brought to our on-line store to make your reservations:

https://w6sfm.com/product/2211/

If you have ANY questions please do not hesitate to email us back at your convenience. Thank you and we hope to see you and your members at our next class!  73,

Michael
N6MQL
SFM ARC Club President

Feb 14 Board Mtg Minutes correction

Michele - WH7QC
 

H all!
I need to make a correction from the recent Board Mtg minutes per Mike Perry's volunteer list:
Matt Pauley KK6YMU should be: MATT PAULY KK6YMJ. I apologize for the error. 

73
Michele
WH7QC
SFARC Secretary

Re: Call For Volunteers - MS Walk Folsom - Sunday, April 26

Joe - KN6FH
 

count me in Michael


On Feb 28, 2020, at 7:50 AM, Michael - KK6GLP <mrprry2@...> wrote:

Hello,

The next Club community volunteer event is less than two months away - MS Walk in Folsom - April 26!

This event lasts less than three hours. Net Control is at historic downtown Folsom, with three radio stations at rest stops on the route. An HT with a good antenna is sufficient to communicate with Net Control. This is a great opportunity for new hams to test their radio skills with their HTs.

Our job will be to relay communications between event control and the field stations, as well as any incidents from the field to event control.

Please let me know if you are interested in joining us for the event. I will provide instructions on signing up.

73

Mike Perry KK6GLP
Volunteer Events Coordinator, SFARC

<IMG_1844.jpg>
<IMG_1837.jpg>

Event: CERA Crazy Miner Enduro - Saturday, 3 October 2020 #cal-invite

sfarc@w6ek.groups.io Calendar <sfarc@...>
 

CERA Crazy Miner Enduro

When:
Saturday, 3 October 2020
7:00am to 3:00pm
(UTC-07:00) America/Los Angeles

Where:
Eldorado National Forest east of Georgetown

Organizer: mrprry2@...

Description:
Volunteer Event - CERA Crazy Miner Enduro communications team. A fun annual event providing communications for a motorcycle enduro event held near Georgetown, CA in the Eldorado Forest.  A great opportunity to use your VHF/UHF go kit or to hone or learn portable operation skills alongside experienced station operators. Some of the crew camp overnight and bring along their HF gear. Positions fill-up early. RSVP Today! 

Re: Cooties and Chicken Little

Jef - N5JEF
 

Jim -

Thank you very much for speaking up on behalf of science, reason, and best practices--as we currently know them.  That's nice to see in these times of extreme hype and popular echo chambers.

- Jef

On Sat, Feb 29, 2020 at 2:32 PM Michael - KK6GLP <mrprry2@...> wrote:
Things have been worse here. The Sacramento Union of November 11, 1918 has many articles about people in the Sacramento area dying of Spanish influenza and being arrested for not wearing face masks -- in addition to news of events in Europe that day.


Mike Perry KK6GLP

On Sat, Feb 29, 2020 at 1:04 PM Jim - N6MED <n6medjim@...> wrote:
I realize this post doesn't have anything to do directly with ham radio. But, I hope it will be tolerated in the spirit in which I have keyboarded it.
Some thoughts and 2-cents prompted by a conversation on the repeater re Covid-19 aka coronavirus, virulence, Corona beer, lime disease, and zombie apocalypse. Full disclosure, I am not either an epidemiologist or virologist. I worked as a cardiac telemetry-medical registered nurse on an acute care unit in a local hospital. Among my patients at times were those who required isolation in negative pressure rooms because of the possibility they had a disease that could be transmitted through the air. I have been trained in the use of the appropriate personal protection equipment ("PPE") to prevent getting exposed and infected with nasty cooties.

There is a lot of info floating around, both good and bad re Covid-19 related to how virulent it is, how it can be transmitted, etc. I am a strong proponent of listening to scientists in the know and to one researching information and data from reliable sources. (But for MDs in the media speaking the straight skinny, that excludes the hype on Fox, CNN, and whoever else is driven by a political agenda and selling the most commercials.) I offer just a tiny number of some related to Covid-19 below.
Some facts as they are know today and subject to change as more is learned about this "novel" (new) pathogen. (Covid-19 was initially called the "Novel Coronavirus" because "novel" means it has not been seen previously.)

1. Currently this cootie is transmitted via contact, droplet, or aerosol (limited airborne).
"Contact" means touching a contaminated inanimate object (think doorknob, door "panic bar" handle, money, etc.) that an infected individual has touched.
"Droplet" means that cloud of droplets one releases from sneezing. Also, the big droplets from coughing. Droplets do not remain in the air for very long. I think of an aerosol spray such as from an air freshener.

"Aerosol/airborne" means very fine droplets that are caught in the wind and linger for awhile. (Right now this pathogen is NOT know to be transmitted in the normal airborne sense like TB, mumps, or Legionnaires Disease. Refer to the Feb 16 Thailand Medical News link below.)

2. Germ masks, for lack of a better term, are intended for protection against droplets and are effective for that purpose. The masks commonly worn by Chinese on the street and folks in other countries are frequently worn improperly.
N95 masks (so called because they filter 95% of hazardous particle, including most cooties. Their are also N-100 masks that are more effective, filtering 100% of cooties. (I am not considering respirators in this discussion.)
>> Search YouTube for instructions intended for clinicians for donning masks. <<

3. Alcohol-based hand sanitizer: generally good to clean hands after potential exposure to cooties. HOWEVER: mucus containing flu or other viral agents inhibits the efficacy of hand sanitizer. So, conjure up the image of someone just coughing or sneezing into their hand and grabbing a doorknob. Maximum EEEEWWWW! factor.
Best: through hand washing with soap and water. Ref: https://www.youtube.com/watch?v=3PmVJQUCm4E

4. Virulence: Covid-19 has been known to maintain its virulence for upwards of 9 days, but also as little as a few hours. I read a post from a Chicken Little re the 9 day virulent latency of the cootie. Covid-19 CAN last for that long. HOWEVER and BUT, it is all affected by environmental conditions. Expose the cootie to warm or hot dry air and exposure to the sun (i.e., ultraviolet), and it probably won't last long.

5. Currently the lethality of Covid-19 is around 2% though upwards of 4% has been reported in China. By contract, the flu has a 0.1% mortality. Also, by contrast, the flu has killed more to date than Covid-19 simply because of the pure numbers of those infected.
.
5. Prevention is a matter of Situational Awareness and prudence: avoid crowds, consider surfaces exposed to contact by the general public to be contaminated (almost certainly by the norovirus or flu!). After contacting such surfaces, keep your hands away from your face. Frequent hand washing (ordinary hand or face soap is just fine) is the order of the day.
Though the number infected in the US is still very low, because one who is infected is contagious (incubation period of a couple of weeks) even before symptoms appear. From what I have been able to find, at risk-groups are not limited to the elderly, the very young. I would hazard a guess that those who are immunocompromised (have weakened immune systems) are at higher risk than the general population. Ref: https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200228-sitrep-39-covid-19.pdf

CDC
https://www.cdc.gov/coronavirus/2019-ncov/index.html

https://eportal.mountsinai.ca/Microbiology/faq/transmission.shtml

http://ata-medical.com/2017/04/03/what-is-airborne-transmission/

Feb 16
https://www.thailandmedical.news/news/breaking-news-world-health-organization%E2%80%99s-chief-says-coronavirus-is-airborne-but-many-concealing-this-including-media-from-us,-china-and-europe

Feb 20
https://www.thailandmedical.news/news/china-officially-announces-that-the-coronavirus-can-be-airborne-and-can-be-conditionally-spread-via-aerosol-transmission-

https://www.straitstimes.com/asia/se-asia/coronavirus-can-transmit-via-aerosol-chinese-health-authorities?cx_testId=20&cx_testVariant=cx_1&cx_artPos=0#cxrecs_s
Discovery: HIV-like mutation in the new coronavirus may explain why it’s more contagious than the Sars coronavirus. (Author: science writer for the South China Morning Post)

https://www.inkstonenews.com/health/hiv-mutation-makes-covid-19-more-infectious-sars-scientists-say/article/3052617

Feb 28: COVID-19 a Reminder of the Challenge of Emerging Infectious Diseases
https://www.nih.gov/news-events/news-releases/covid-19-reminder-challenge-emerging-infectious-diseases

Re: Cooties and Chicken Little

Michael - N6MRP
 

Things have been worse here. The Sacramento Union of November 11, 1918 has many articles about people in the Sacramento area dying of Spanish influenza and being arrested for not wearing face masks -- in addition to news of events in Europe that day.


Mike Perry KK6GLP

On Sat, Feb 29, 2020 at 1:04 PM Jim - N6MED <n6medjim@...> wrote:
I realize this post doesn't have anything to do directly with ham radio. But, I hope it will be tolerated in the spirit in which I have keyboarded it.
Some thoughts and 2-cents prompted by a conversation on the repeater re Covid-19 aka coronavirus, virulence, Corona beer, lime disease, and zombie apocalypse. Full disclosure, I am not either an epidemiologist or virologist. I worked as a cardiac telemetry-medical registered nurse on an acute care unit in a local hospital. Among my patients at times were those who required isolation in negative pressure rooms because of the possibility they had a disease that could be transmitted through the air. I have been trained in the use of the appropriate personal protection equipment ("PPE") to prevent getting exposed and infected with nasty cooties.

There is a lot of info floating around, both good and bad re Covid-19 related to how virulent it is, how it can be transmitted, etc. I am a strong proponent of listening to scientists in the know and to one researching information and data from reliable sources. (But for MDs in the media speaking the straight skinny, that excludes the hype on Fox, CNN, and whoever else is driven by a political agenda and selling the most commercials.) I offer just a tiny number of some related to Covid-19 below.
Some facts as they are know today and subject to change as more is learned about this "novel" (new) pathogen. (Covid-19 was initially called the "Novel Coronavirus" because "novel" means it has not been seen previously.)

1. Currently this cootie is transmitted via contact, droplet, or aerosol (limited airborne).
"Contact" means touching a contaminated inanimate object (think doorknob, door "panic bar" handle, money, etc.) that an infected individual has touched.
"Droplet" means that cloud of droplets one releases from sneezing. Also, the big droplets from coughing. Droplets do not remain in the air for very long. I think of an aerosol spray such as from an air freshener.

"Aerosol/airborne" means very fine droplets that are caught in the wind and linger for awhile. (Right now this pathogen is NOT know to be transmitted in the normal airborne sense like TB, mumps, or Legionnaires Disease. Refer to the Feb 16 Thailand Medical News link below.)

2. Germ masks, for lack of a better term, are intended for protection against droplets and are effective for that purpose. The masks commonly worn by Chinese on the street and folks in other countries are frequently worn improperly.
N95 masks (so called because they filter 95% of hazardous particle, including most cooties. Their are also N-100 masks that are more effective, filtering 100% of cooties. (I am not considering respirators in this discussion.)
>> Search YouTube for instructions intended for clinicians for donning masks. <<

3. Alcohol-based hand sanitizer: generally good to clean hands after potential exposure to cooties. HOWEVER: mucus containing flu or other viral agents inhibits the efficacy of hand sanitizer. So, conjure up the image of someone just coughing or sneezing into their hand and grabbing a doorknob. Maximum EEEEWWWW! factor.
Best: through hand washing with soap and water. Ref: https://www.youtube.com/watch?v=3PmVJQUCm4E

4. Virulence: Covid-19 has been known to maintain its virulence for upwards of 9 days, but also as little as a few hours. I read a post from a Chicken Little re the 9 day virulent latency of the cootie. Covid-19 CAN last for that long. HOWEVER and BUT, it is all affected by environmental conditions. Expose the cootie to warm or hot dry air and exposure to the sun (i.e., ultraviolet), and it probably won't last long.

5. Currently the lethality of Covid-19 is around 2% though upwards of 4% has been reported in China. By contract, the flu has a 0.1% mortality. Also, by contrast, the flu has killed more to date than Covid-19 simply because of the pure numbers of those infected.
.
5. Prevention is a matter of Situational Awareness and prudence: avoid crowds, consider surfaces exposed to contact by the general public to be contaminated (almost certainly by the norovirus or flu!). After contacting such surfaces, keep your hands away from your face. Frequent hand washing (ordinary hand or face soap is just fine) is the order of the day.
Though the number infected in the US is still very low, because one who is infected is contagious (incubation period of a couple of weeks) even before symptoms appear. From what I have been able to find, at risk-groups are not limited to the elderly, the very young. I would hazard a guess that those who are immunocompromised (have weakened immune systems) are at higher risk than the general population. Ref: https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200228-sitrep-39-covid-19.pdf

CDC
https://www.cdc.gov/coronavirus/2019-ncov/index.html

https://eportal.mountsinai.ca/Microbiology/faq/transmission.shtml

http://ata-medical.com/2017/04/03/what-is-airborne-transmission/

Feb 16
https://www.thailandmedical.news/news/breaking-news-world-health-organization%E2%80%99s-chief-says-coronavirus-is-airborne-but-many-concealing-this-including-media-from-us,-china-and-europe

Feb 20
https://www.thailandmedical.news/news/china-officially-announces-that-the-coronavirus-can-be-airborne-and-can-be-conditionally-spread-via-aerosol-transmission-

https://www.straitstimes.com/asia/se-asia/coronavirus-can-transmit-via-aerosol-chinese-health-authorities?cx_testId=20&cx_testVariant=cx_1&cx_artPos=0#cxrecs_s
Discovery: HIV-like mutation in the new coronavirus may explain why it’s more contagious than the Sars coronavirus. (Author: science writer for the South China Morning Post)

https://www.inkstonenews.com/health/hiv-mutation-makes-covid-19-more-infectious-sars-scientists-say/article/3052617

Feb 28: COVID-19 a Reminder of the Challenge of Emerging Infectious Diseases
https://www.nih.gov/news-events/news-releases/covid-19-reminder-challenge-emerging-infectious-diseases

Re: Coronavirus info

Jim - N6MED
 

I'm going to guess that Covid-19 mortality is going to wiggle as more folks become infected. I read that it has been reported inside China as high as 4%.
It is likely keeping the epidemiology sleuths hard at work. Stay tuned! More news at 11...

Re: Cooties and Chicken Little

Jeff - KM6RGO
 

You comments are inline with what the physicians I work with are recommending for our cancer patients.  Obviously things can change, but, this is very helpful.  The attached resources also look good.
Thank you for your two cents!

Jeff, KM6RGO


On Sat, Feb 29, 2020 at 1:04 PM Jim - N6MED <n6medjim@...> wrote:
I realize this post doesn't have anything to do directly with ham radio. But, I hope it will be tolerated in the spirit in which I have keyboarded it.
Some thoughts and 2-cents prompted by a conversation on the repeater re Covid-19 aka coronavirus, virulence, Corona beer, lime disease, and zombie apocalypse. Full disclosure, I am not either an epidemiologist or virologist. I worked as a cardiac telemetry-medical registered nurse on an acute care unit in a local hospital. Among my patients at times were those who required isolation in negative pressure rooms because of the possibility they had a disease that could be transmitted through the air. I have been trained in the use of the appropriate personal protection equipment ("PPE") to prevent getting exposed and infected with nasty cooties.

There is a lot of info floating around, both good and bad re Covid-19 related to how virulent it is, how it can be transmitted, etc. I am a strong proponent of listening to scientists in the know and to one researching information and data from reliable sources. (But for MDs in the media speaking the straight skinny, that excludes the hype on Fox, CNN, and whoever else is driven by a political agenda and selling the most commercials.) I offer just a tiny number of some related to Covid-19 below.
Some facts as they are know today and subject to change as more is learned about this "novel" (new) pathogen. (Covid-19 was initially called the "Novel Coronavirus" because "novel" means it has not been seen previously.)

1. Currently this cootie is transmitted via contact, droplet, or aerosol (limited airborne).
"Contact" means touching a contaminated inanimate object (think doorknob, door "panic bar" handle, money, etc.) that an infected individual has touched.
"Droplet" means that cloud of droplets one releases from sneezing. Also, the big droplets from coughing. Droplets do not remain in the air for very long. I think of an aerosol spray such as from an air freshener.

"Aerosol/airborne" means very fine droplets that are caught in the wind and linger for awhile. (Right now this pathogen is NOT know to be transmitted in the normal airborne sense like TB, mumps, or Legionnaires Disease. Refer to the Feb 16 Thailand Medical News link below.)

2. Germ masks, for lack of a better term, are intended for protection against droplets and are effective for that purpose. The masks commonly worn by Chinese on the street and folks in other countries are frequently worn improperly.
N95 masks (so called because they filter 95% of hazardous particle, including most cooties. Their are also N-100 masks that are more effective, filtering 100% of cooties. (I am not considering respirators in this discussion.)
>> Search YouTube for instructions intended for clinicians for donning masks. <<

3. Alcohol-based hand sanitizer: generally good to clean hands after potential exposure to cooties. HOWEVER: mucus containing flu or other viral agents inhibits the efficacy of hand sanitizer. So, conjure up the image of someone just coughing or sneezing into their hand and grabbing a doorknob. Maximum EEEEWWWW! factor.
Best: through hand washing with soap and water. Ref: https://www.youtube.com/watch?v=3PmVJQUCm4E

4. Virulence: Covid-19 has been known to maintain its virulence for upwards of 9 days, but also as little as a few hours. I read a post from a Chicken Little re the 9 day virulent latency of the cootie. Covid-19 CAN last for that long. HOWEVER and BUT, it is all affected by environmental conditions. Expose the cootie to warm or hot dry air and exposure to the sun (i.e., ultraviolet), and it probably won't last long.

5. Currently the lethality of Covid-19 is around 2% though upwards of 4% has been reported in China. By contract, the flu has a 0.1% mortality. Also, by contrast, the flu has killed more to date than Covid-19 simply because of the pure numbers of those infected.
.
5. Prevention is a matter of Situational Awareness and prudence: avoid crowds, consider surfaces exposed to contact by the general public to be contaminated (almost certainly by the norovirus or flu!). After contacting such surfaces, keep your hands away from your face. Frequent hand washing (ordinary hand or face soap is just fine) is the order of the day.
Though the number infected in the US is still very low, because one who is infected is contagious (incubation period of a couple of weeks) even before symptoms appear. From what I have been able to find, at risk-groups are not limited to the elderly, the very young. I would hazard a guess that those who are immunocompromised (have weakened immune systems) are at higher risk than the general population. Ref: https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200228-sitrep-39-covid-19.pdf

CDC
https://www.cdc.gov/coronavirus/2019-ncov/index.html

https://eportal.mountsinai.ca/Microbiology/faq/transmission.shtml

http://ata-medical.com/2017/04/03/what-is-airborne-transmission/

Feb 16
https://www.thailandmedical.news/news/breaking-news-world-health-organization%E2%80%99s-chief-says-coronavirus-is-airborne-but-many-concealing-this-including-media-from-us,-china-and-europe

Feb 20
https://www.thailandmedical.news/news/china-officially-announces-that-the-coronavirus-can-be-airborne-and-can-be-conditionally-spread-via-aerosol-transmission-

https://www.straitstimes.com/asia/se-asia/coronavirus-can-transmit-via-aerosol-chinese-health-authorities?cx_testId=20&cx_testVariant=cx_1&cx_artPos=0#cxrecs_s
Discovery: HIV-like mutation in the new coronavirus may explain why it’s more contagious than the Sars coronavirus. (Author: science writer for the South China Morning Post)

https://www.inkstonenews.com/health/hiv-mutation-makes-covid-19-more-infectious-sars-scientists-say/article/3052617

Feb 28: COVID-19 a Reminder of the Challenge of Emerging Infectious Diseases
https://www.nih.gov/news-events/news-releases/covid-19-reminder-challenge-emerging-infectious-diseases

Cooties and Chicken Little

Jim - N6MED
 

I realize this post doesn't have anything to do directly with ham radio. But, I hope it will be tolerated in the spirit in which I have keyboarded it.
Some thoughts and 2-cents prompted by a conversation on the repeater re Covid-19 aka coronavirus, virulence, Corona beer, lime disease, and zombie apocalypse. Full disclosure, I am not either an epidemiologist or virologist. I worked as a cardiac telemetry-medical registered nurse on an acute care unit in a local hospital. Among my patients at times were those who required isolation in negative pressure rooms because of the possibility they had a disease that could be transmitted through the air. I have been trained in the use of the appropriate personal protection equipment ("PPE") to prevent getting exposed and infected with nasty cooties.

There is a lot of info floating around, both good and bad re Covid-19 related to how virulent it is, how it can be transmitted, etc. I am a strong proponent of listening to scientists in the know and to one researching information and data from reliable sources. (But for MDs in the media speaking the straight skinny, that excludes the hype on Fox, CNN, and whoever else is driven by a political agenda and selling the most commercials.) I offer just a tiny number of some related to Covid-19 below.
Some facts as they are know today and subject to change as more is learned about this "novel" (new) pathogen. (Covid-19 was initially called the "Novel Coronavirus" because "novel" means it has not been seen previously.)

1. Currently this cootie is transmitted via contact, droplet, or aerosol (limited airborne).
"Contact" means touching a contaminated inanimate object (think doorknob, door "panic bar" handle, money, etc.) that an infected individual has touched.
"Droplet" means that cloud of droplets one releases from sneezing. Also, the big droplets from coughing. Droplets do not remain in the air for very long. I think of an aerosol spray such as from an air freshener.

"Aerosol/airborne" means very fine droplets that are caught in the wind and linger for awhile. (Right now this pathogen is NOT know to be transmitted in the normal airborne sense like TB, mumps, or Legionnaires Disease. Refer to the Feb 16 Thailand Medical News link below.)

2. Germ masks, for lack of a better term, are intended for protection against droplets and are effective for that purpose. The masks commonly worn by Chinese on the street and folks in other countries are frequently worn improperly.
N95 masks (so called because they filter 95% of hazardous particle, including most cooties. Their are also N-100 masks that are more effective, filtering 100% of cooties. (I am not considering respirators in this discussion.)
>> Search YouTube for instructions intended for clinicians for donning masks. <<

3. Alcohol-based hand sanitizer: generally good to clean hands after potential exposure to cooties. HOWEVER: mucus containing flu or other viral agents inhibits the efficacy of hand sanitizer. So, conjure up the image of someone just coughing or sneezing into their hand and grabbing a doorknob. Maximum EEEEWWWW! factor.
Best: through hand washing with soap and water. Ref: https://www.youtube.com/watch?v=3PmVJQUCm4E

4. Virulence: Covid-19 has been known to maintain its virulence for upwards of 9 days, but also as little as a few hours. I read a post from a Chicken Little re the 9 day virulent latency of the cootie. Covid-19 CAN last for that long. HOWEVER and BUT, it is all affected by environmental conditions. Expose the cootie to warm or hot dry air and exposure to the sun (i.e., ultraviolet), and it probably won't last long.

5. Currently the lethality of Covid-19 is around 2% though upwards of 4% has been reported in China. By contract, the flu has a 0.1% mortality. Also, by contrast, the flu has killed more to date than Covid-19 simply because of the pure numbers of those infected.
.
5. Prevention is a matter of Situational Awareness and prudence: avoid crowds, consider surfaces exposed to contact by the general public to be contaminated (almost certainly by the norovirus or flu!). After contacting such surfaces, keep your hands away from your face. Frequent hand washing (ordinary hand or face soap is just fine) is the order of the day.
Though the number infected in the US is still very low, because one who is infected is contagious (incubation period of a couple of weeks) even before symptoms appear. From what I have been able to find, at risk-groups are not limited to the elderly, the very young. I would hazard a guess that those who are immunocompromised (have weakened immune systems) are at higher risk than the general population. Ref: https://www.who.int/docs/default-source/coronaviruse/situation-reports/20200228-sitrep-39-covid-19.pdf

CDC
https://www.cdc.gov/coronavirus/2019-ncov/index.html

https://eportal.mountsinai.ca/Microbiology/faq/transmission.shtml

http://ata-medical.com/2017/04/03/what-is-airborne-transmission/

Feb 16
https://www.thailandmedical.news/news/breaking-news-world-health-organization%E2%80%99s-chief-says-coronavirus-is-airborne-but-many-concealing-this-including-media-from-us,-china-and-europe

Feb 20
https://www.thailandmedical.news/news/china-officially-announces-that-the-coronavirus-can-be-airborne-and-can-be-conditionally-spread-via-aerosol-transmission-

https://www.straitstimes.com/asia/se-asia/coronavirus-can-transmit-via-aerosol-chinese-health-authorities?cx_testId=20&cx_testVariant=cx_1&cx_artPos=0#cxrecs_s
Discovery: HIV-like mutation in the new coronavirus may explain why it’s more contagious than the Sars coronavirus. (Author: science writer for the South China Morning Post)

https://www.inkstonenews.com/health/hiv-mutation-makes-covid-19-more-infectious-sars-scientists-say/article/3052617

Feb 28: COVID-19 a Reminder of the Challenge of Emerging Infectious Diseases
https://www.nih.gov/news-events/news-releases/covid-19-reminder-challenge-emerging-infectious-diseases

Some recent numbers...

carl.wf6j@gmail.com
 
Edited

Coronavirus dat by country… don’t let the news fool you!

Re: Call For Volunteers - MS Walk Folsom - Sunday, April 26

Greg D
 

Already on my calendar.  Let me know how I can help.

Greg  KO6TH


Michael - KK6GLP wrote:

Hello,

The next Club community volunteer event is less than two months away - MS Walk in Folsom - April 26!

This event lasts less than three hours. Net Control is at historic downtown Folsom, with three radio stations at rest stops on the route. An HT with a good antenna is sufficient to communicate with Net Control. This is a great opportunity for new hams to test their radio skills with their HTs.

Our job will be to relay communications between event control and the field stations, as well as any incidents from the field to event control.

Please let me know if you are interested in joining us for the event. I will provide instructions on signing up.

73

Mike Perry KK6GLP
Volunteer Events Coordinator, SFARC


Re: Call For Volunteers - MS Walk Folsom - Sunday, April 26

Brian Gohl - AI6US
 

Mike,

Several of Chris's, KN6CCC McClatchy HS students will be looking for volunteer communication opportunities (required for class) and amateur radio Elmering. It would be a wonderful opportunity to get them involved!

Best Regards! 
Brian Gohl - AI6US 
(916) 770-7751 cell


-------- Original message --------
From: Michael - KK6GLP <mrprry2@...>
Date: 2/28/20 10:15 AM (GMT-08:00)
To: sfarc@w6ek.groups.io, Jeff Morgan KM6RGO <jamontrail@...>
Subject: Re: [from W6EK Groups.io] Call For Volunteers - MS Walk Folsom - Sunday, April 26

Thanks Jeff! I put you on the list.

To volunteer with MS Walk, go to their web page, click on link, go to the Ham Radio Volunteers, etc. etc... There is a waiver form to sign.  https://secure.nationalmssociety.org/site/TR?fr_id=31018&pg=informational&sid=13251

One month prior, when we should have all our volunteers, I will send instructions.

73

Mike KK6GLP

On Fri, Feb 28, 2020 at 9:58 AM Jeff - KM6RGO <jamontrail@...> wrote:
Mike,

I’d like to volunteer.  I can commit to April 26.  

Thanks!

Jeff, KM6RGO
916-849-0736

On Feb 28, 2020, at 8:01 AM, Dennis - WU6X <wu6x@...> wrote:

 I will be on vacation unfortunately 

Dennis
530-305-0180
iPhone Mobile

On Feb 28, 2020, at 7:50 AM, Michael - KK6GLP <mrprry2@...> wrote:

Hello,

The next Club community volunteer event is less than two months away - MS Walk in Folsom - April 26!

This event lasts less than three hours. Net Control is at historic downtown Folsom, with three radio stations at rest stops on the route. An HT with a good antenna is sufficient to communicate with Net Control. This is a great opportunity for new hams to test their radio skills with their HTs.

Our job will be to relay communications between event control and the field stations, as well as any incidents from the field to event control.

Please let me know if you are interested in joining us for the event. I will provide instructions on signing up.

73

Mike Perry KK6GLP
Volunteer Events Coordinator, SFARC

<IMG_1844.jpg>
<IMG_1837.jpg>

--
Dennis - WU6X


--
Brian- AI6US

Re: Call For Volunteers - MS Walk Folsom - Sunday, April 26

Michael - N6MRP
 

Thanks Jeff! I put you on the list.

To volunteer with MS Walk, go to their web page, click on link, go to the Ham Radio Volunteers, etc. etc... There is a waiver form to sign.  https://secure.nationalmssociety.org/site/TR?fr_id=31018&pg=informational&sid=13251

One month prior, when we should have all our volunteers, I will send instructions.

73

Mike KK6GLP

On Fri, Feb 28, 2020 at 9:58 AM Jeff - KM6RGO <jamontrail@...> wrote:
Mike,

I’d like to volunteer.  I can commit to April 26.  

Thanks!

Jeff, KM6RGO
916-849-0736

On Feb 28, 2020, at 8:01 AM, Dennis - WU6X <wu6x@...> wrote:

 I will be on vacation unfortunately 

Dennis
530-305-0180
iPhone Mobile

On Feb 28, 2020, at 7:50 AM, Michael - KK6GLP <mrprry2@...> wrote:

Hello,

The next Club community volunteer event is less than two months away - MS Walk in Folsom - April 26!

This event lasts less than three hours. Net Control is at historic downtown Folsom, with three radio stations at rest stops on the route. An HT with a good antenna is sufficient to communicate with Net Control. This is a great opportunity for new hams to test their radio skills with their HTs.

Our job will be to relay communications between event control and the field stations, as well as any incidents from the field to event control.

Please let me know if you are interested in joining us for the event. I will provide instructions on signing up.

73

Mike Perry KK6GLP
Volunteer Events Coordinator, SFARC

<IMG_1844.jpg>
<IMG_1837.jpg>

--
Dennis - WU6X