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?
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