K1 power out on 20m ... SUCCESS !

[David L DuPuy]

Don,

you pinpointed the problem exactly!  In the buffer stage, I'm afraid I
installed the wrong device for Q14 (really careless, to say the least).  I
pulled out the ZVN4424A, and replaced it with a new 2N4124, and I now have
power output on 20m.

However, I do still have a problem on 20m.  I did not have a clean sound on
the sidetone (sounded like heavy key clicks) on 40m before replacing Q14
today.  After replacing Q14 I now have a nasty sort of two-tone, worse
towards 5 watts out.  Sounds like an overload, or maybe RF getting in
somewhere.  I have the STL set way down to 1 or 2, and that controls the
volume, but the sidetone is still pretty awful.  In addition, I'm getting a
loud sidetone when I activate the TUNE function on 20m (not true on 40m).
Any ideas on this new problem?  Many, many thanks for your help.  David
AC4BN
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[Don Wilhelm-4]

David,

Certainly do have a strong suggestion - check to see what transistor you
used at Q4.  That is where the ZVN4424 should be located. Whatever you
installed at Q4 may be allowing the transmit energy to get into the
receiver - Q4 is in the T/R switch area.

73,
Don W3FPR

On 3/20/2013 5:21 PM, David L DuPuy wrote:

> Don,
>
> you pinpointed the problem exactly!  In the buffer stage, I'm afraid I
> installed the wrong device for Q14 (really careless, to say the least).  I
> pulled out the ZVN4424A, and replaced it with a new 2N4124, and I now have
> power output on 20m.
>
> However, I do still have a problem on 20m.  I did not have a clean sound on
> the sidetone (sounded like heavy key clicks) on 40m before replacing Q14
> today.  After replacing Q14 I now have a nasty sort of two-tone, worse
> towards 5 watts out.  Sounds like an overload, or maybe RF getting in
> somewhere.  I have the STL set way down to 1 or 2, and that controls the
> volume, but the sidetone is still pretty awful.  In addition, I'm getting a
> loud sidetone when I activate the TUNE function on 20m (not true on 40m).
> Any ideas on this new problem?  Many, many thanks for your help.  David
> AC4BN
> ______________________________________________________________
> 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
>

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