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List:       elecraft
Subject:    Re: [Elecraft] Strong Signals FD
From:       Wilson Lamb via Elecraft <elecraft () mailman ! qth ! net>
Date:       2022-06-29 20:46:07
Message-ID: 387321115.286577659.1656535567897.JavaMail.zimbra () embarqmail ! com
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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@elecraft.com>
To: Wilson <infomet@embarqmail.com>
Cc: Elecraft <elecraft@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@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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