Re: Field Day and FT8 #fieldday #digital

Orion, AI6JB



That works, except if you return to calling CQ.  Now you are on the S&P’s frequency.  You are potentially going to interfere with them. 


Remember, the S&P station is searching for ANY station and is NOT limiting themselves to the even or odd cycle.  Therefore, if you TX on their TX frequency and they choose to respond to a station that uses the other cycle time, you will be interfering with them.


I think the advise still stands, lock your transmit frequency whether or not you are Running or S&P.



Orion Endres, AI6JB

1201 Wood Oak Court, Roseville, CA 95747-7383

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


P.S.  For those who do not know the terms Running and S&P: “Running” means calling CQ, and “S&P” means Search and Pounce.



From: Greg D <ko6th.greg@...>
Sent: Thursday, June 25, 2020 14:04
To:; ojendres@...
Subject: Re: [from W6EK] Field Day and FT8


Hi Orion,

Now, that makes a lot of sense.  Adding, since this is SSB, not FM, the capture effect which traditional AFSK packet radio depends on, doesn't apply.  What I don't know is how well JT's algorithms handle multiple colliding signals. 

So, if you're hunting and pouncing, check the box to stay put.  If you're calling CQ, then by your logic you should uncheck the box so that when the person responds, your Tx will move to their frequency, which is presumably a nice quiet spot for them, so they'd be more likely to hear you?

Greg  KO6TH

Orion, AI6JB wrote:

Carl & Gerry,


I am very confused as well, so a spent some time drawing bubbles and lines to figure this out.  Does this make sense …


Gerry if you call CQ and I am the only other person in the world, we can both TX and RX on the same frequency.  That works because for the first 15 sec you are TX’ing and the next 15 sec I am TX’ing.


The problem comes when you call CQ and Carl, with his mega station, also responds.  Since we are both on the same frequency he will either over-power me or we will interfere with each other and you would decode nothing or I will over-power him.


Now, if we all transmit on different frequencies, Carl transmits on a frequency other than yours, and I transmit on a frequency other his and yours, you will be able to see both of us.  Your band activity window will change color showing both of us responding.  You will be able to pick the better of us two, Carl, by double clicking on his call.  Your RX Frequency window will then lock on to Carl’s TX frequency the exchange will continue.  I will see you chose him on the next cycle in my band activity window which is a hint to move on.


If you had picked me instead, my RX Frequency window is locked on to your TX frequency and the software will automatically give the response immediately on the next cycle.


In a nutshell, if we all TX and RX on the same frequency, it will be slug fest to get your attention.  The stronger station will prevail or no one will win.  Does that make sense?



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: <> On Behalf Of Carl - N6CKV
Sent: Thursday, June 25, 2020 13:00
To: Gerry Brentnall <gjbrent@...>;
Subject: Re: [from W6EK] Field Day and FT8



From the help file
Check the box Hold Tx Freq to ensure that the specified Tx frequency is not changed automatically when you double-click on decoded text or a signal in the waterfall.

I am not sure but I think it keeps you from "grabbing" the other station's frequency if you chose to tx your own CQ



Join to automatically receive all group messages.