[Elecraft] K2 Audio Level using filters

[Earl Richardet]

Hi Don,

Just wanted to let you know that I fixed the problem.  I re-soldered all the
switching diodes and also found a very small piece of clipping sticking to
the back side of the board.  Don't know if it was the clipping or the
re-soldering but working perfectly now.  Thanks for all the help.

Earl VE7Qj

-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
Sent: Monday, April 16, 2012 10:18 PM
To: Earl Richardet
Cc: Elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 Audio Level using filters

Earl,

It does sound like you have a problem with the filter switching diode matrix
on the KSB2 board.  If your signal level is decreased from the level
obtained when the KSB2 is bypassed ( jumper between pins 1 and 3 of both J9
and J10). then you have a problem with the KSB2 board.  Make certainly all
the diodes are correctly oriented, and re-flow the soldering in the OP1
filter end of the board.

If you are relying on the BFO frequency settings listed in the KSB2 manual,
be advised that there "is a better way" -- go to my webpage www.w3fpr.com
article on K2 Dial Calibration and go to "page 3" which deals with the
filter settings.  Use Spectrogram to give you a visual indication of the
filter placement.  Note that recent K2s will have wide filter widths that
are much wider than indicated i\on the K2 display  -- use Spectrogram to
indicate the actual filter width.

Spectrogram version 5.17 and Spectrogram version 16 may be downloaded from
my website,  Both have been seving my needs for a long time and should be
free of problems (there have been reports of bad downloads of version 16).

73,
Don W3FPR



On 4/16/2012 10:28 PM, Earl Richardet wrote:
> Hello to the Reflector,
>
>
>
> I've recently completed building my Elecraft K2 transceiver and I have 
> one problem that I would like to resolve.  Up to the point where I 
> installed the SSB kit into the radio, the audio level on each of the 
> filter selections was strong and working fine.  After I installed the 
> SSB kit, the audio level on the CQ filters dropped off significantly.  
> The OP1 SSB filters are working great and have strong audio output, 
> but as soon as I select FL3 or FL4 the audio drops way off.  Otherwise 
> the SSB board is working fine and I great audio reports from other
stations on my transmit audio.
>
>
>
> At this point I have confirmed all the components on the SSB, no bridges
or
> splatter that I can see.  Everything appears to be ok.   Don't know where
to
> start troubleshooting this issue.
>
>
>
> Appreciate any suggestions on troubleshooting or if anyone has 
> experienced this themselves and of course what you did  to resolve.
>
>
>
> Thanks and Regards,
>
>
>
> Earl VE7QJ
>
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