[Elecraft] Strong Signals FD

[Wilson Lamb]

Thanks, Wayne, I figured as much, clever, as usual! 
I think it was the SSB station, because the notice sppeared for only a second, if that. 
The surprising part is that tuning was disabled during the strong signal period. 
Our previous FDs (two clubs) have been QRP for years, so it couldn't happen. 
Our CW did very well,#2, but we wanted the SSB people to have more fun this time, which they did. 
We had 4xK3, 1xK3s, and one I never saw.   
I had digi hash from a nearby station.  Should have given them my updated (synth) unit, but forgot. 
Thanks, 
WL 
    

-----Original Message-----

From: Wayne <n6kr at elecraft.com>
To: Wilson <infomet at embarqmail.com>
Cc: Elecraft <elecraft at mailman.qth.net>
Date: Wednesday, 29 June 2022 7:27 PM GMT
Subject: Re: [Elecraft] Strong Signals FD

Hi Wilson, 

The K3 looks for "reverse power" coming back into the antenna jacks in receive mode. This is possible if there's a nearby transmitter, typically when the antennas are in each other's near field. On 40 m this could happen even at 100'. 

If reverse power becomes excessive, the K3 will cut off RF input to the receiver for some period of time and display the Strong Signal message. When the reverse power condition disappears, operation returns to normal. 

The solution is to separate the antennas more or reduce power. 

73, 
Wayne 
N6KR 



> On Jun 29, 2022, at 10:25 AM, Wilson Lamb via Elecraft <elecraft at mailman.qth.net> wrote: 
> 
> 
> There's always something new... 
> Our clubs went to 100W this year, after being leaders in QRP for some years, up to #2. 
> We wanted new hams and the SSB crowd to have more fun. 
> I operated CW with one of my two K3, which worked fine, as usual. 
> But I experienced something never seen before. There was a 40m SSB station not far from me, with a dipole about 45 degrees and 100 feet away. 
> I would occasionally get "Strong Signal" on my display, accompanied by very brief interruptions to my anility to change frequency. I'd start turning the knob and the VFO would take 200-500 mS (guess) to respond. 
> I also noticed the same thing re keying. Sometimes the first dit or dah would be dropped when I started sending! 
> Is this normal, common? 
> It didn't cause a problem and there was no lingering effect. 
> WL 
> 
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