John,
That sounds like a leaky capacitor on the KNB2 board. The first ones to
suspect are the 0.1 uf caps with 0.1 inch lead spacing. I would suggest
arbitrarily replacing all of them as the first order of business.
It is strange that both TX and RX are affected because the KNB2 is only
in the receive path - but then, strange things can happen.
73,
Don W3FPR
JohnK1JD wrote:
All
The intermittent (cold rig only) problem cited below completely
disappeared upon removal of the NB and SSB boards (replacing them with
the requisite jumpers and the capacitor). The KSB2 board was put back
first and the rig still behaved perfectly. However, when the NB board
was plugged back in the problem returned (note - the NB function is
turned off). Interesting that both RX and TX are affected. More to
follow...
73,
John K1JD
K3/100 #071
K2/100 #583
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 rig 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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