[Elecraft] K2 RX/TX Problem has been localized

[JohnK1JD]

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?