[Elecraft] K2 RX/TX Problem

[Don Wilhelm]

John,

A broadband 'hash' sound on both transmit and receive may be the result 
of magnetic coupling to the VFO.

As a test, I suggest that you physically isolate the K2 from anything 
that might contain a transformer (and that includes some lamps).  If the 
problem reduces or disappears, then you have 2 options - 1) re-arrange 
your operating position so the K2 is at least 2 feet away from anything 
containing an AC transformer or 2) add the VCO shield kit.

If isolating the K2 does not cure the problem, then you will have to do 
some de-bugging.  The most likely areas for the source of a problem of 
that nature is the VFO and the BFO, and the most likely cause of a 
problem that responds to heat and time is a bad solder connection.

73,
Don W3FPR

JohnK1JD wrote:
> Trusty K2/100 SN#583 has a problem which is the first significant issue since building the basic K2 in Oct of 1999. The has been mostly unused (neglected?) since the K3 arrived last November, but decided to fire it up the other day and discovered that both RX and TX exhibit a broadband 'hash' sound instead of distinct CW when first turned on, both on signals received and on its transmitted signal. This problem lessens as the radio warms up and eventually disappears completely. I have used it quite a bit this weekend and it's been fine - until I turn it off for a few hours.
>
> The frequencies for the VCO and BFO seem OK as do the voltages. Cal PLL was performed and completed without any errors.
>
> Has anyone experienced this intermittent problem before?
>   
>