[Elecraft] K2 Poor sensitivity

[Brian Denley]

Nice work Paul.

Brian 
KB1VBF
Sent from my iPad

> On Sep 30, 2016, at 10:41 AM, Radiobeamer <paul.g4kzy at gmail.com> wrote:
> 
> Hi All,
> 
> Firstly, thanks for all of your help.  I checked the RFCs on the SSB board
> as per Steve's suggestion and they were OK, although my problem was quite
> similar (see below).  Also, thanks to Frank for your suggestion.  As I'm in
> the UK it is quite cost prohibitive to send the radio to Don.  Also, being
> able to fault-find, align and repair the K2 is part of its attraction.
> 
> Secondly, I managed to find the fault!.  I noticed that the sensitivity on
> the transverter input was better than on the antenna input.  Probing about
> on the TR switch led me to the conclusion that RFC3 was not connected
> properly, leading to excessive loss in D4.  Problems with poor soldering on
> enamelled wire are well known!  After re-making the joints of RFC3 I can
> hear signals down to -130dBm on all bands (with the preamp on).
> 
> I've still not measured the sensitivity accurately but it does seem to work
> properly now.  I'll re-align everything now for 100% performance.
> 
> Thanks again for a helpful and friendly group.
> 
> 73,
> 
> Paul
> G4KZY
> 
> 
> 
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