[Elecraft] K3S HI SIGNAL

[Wayne Burdick]

The internal band-pass filters are very narrowbanded and very high Q. I believe John was referring to external band-pass filters of the type used in multi-transmitter stations that may be operating at high power into antennas in each other’s near-fields. 

The K3S and K3 can survive a lot of abuse of this type; it includes built-in signal detection and shut-down of various RX stages. But pumping many watts into the front end (due to tight antenna coupling) is never a good idea.

73,
Wayne
N6KR



> On Jun 24, 2018, at 4:10 PM, donovanf at starpower.net wrote:
> 
> The K3 and K3S have built in transmit and receive bandpass filters. 
> Unfortunately their performance data is unpublished. 
> 
> 
> 
> http://elecraft.com/manual/K3_Schematics_Jun_2010.pdf 
> See the third page 
> 
> 
> 
> David hasn't shared what the specific circumstances may have 
> caused the HI SIGNAL response. That may give a clue as to 
> the nature of the fault. 
> 
> 
> 73 
> Frank 
> W3LPL 
> 
> 
> 
> 
> ----- Original Message -----
> 
> From: john at kk9a.com 
> To: "Elecraft Reflector" <elecraft at mailman.qth.net> 
> Sent: Sunday, June 24, 2018 3:53:13 PM 
> Subject: [Elecraft] K3S HI SIGNAL 
> 
> Did you use bandpass filters? 
> 
> John KK9A 
> 
> aj4tf wrote: 
> 
> K3S 10669 suddenly stopped receiving during Field day and displayed HI 
> SIGNAL, even with nothing connected to the antenna. Performed an EE INIT 
> without any effect. Sluggish response to the front panel controls. Any 
> advice? 
> David AJ4TF 
> 
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