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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[donovanf]

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Unfortunately their performance data is unpublished.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: [hidden email]
To: "Elecraft Reflector" <[hidden email]>
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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[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, [hidden email] 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 Unfortunately their performance data is unpublished.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: [hidden email]
> To: "Elecraft Reflector" <[hidden email]>
> 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
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft 
> Help: http://mailman.qth.net/mmfaq.htm 
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net 
> Please help support this email list: http://www.qsl.net/donate.html 
> Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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