[Hallicrafters] FW: SX-101A

[Langston, Mike]

Mine was working just fine. It had been a couple of months since I last
used it so I fired it up over the Memorial weekend. Now it has this
"problem". 

It's going to be hard to describe. It is like a steady pulsing
interruption to the signal, barely discernable on SSB except with very
slow talkers. But with a steady carrier or by turning on the calibrator
it is very noticeable. The interruption is very short (much shorter than
a "dit") and the rate is about 3-4 per second. 

The sensitivity, selectivity, AVC, calibrator, and noise limiter are all
normal.

I've heard the term "motor-boating" used before but I'm not sure what
circuit is susceptible to it or what it sounds like. The reason I
mention it is that with a steady carrier, it sounds like an outboard
motor idling. There is no noticeable effect on s-meter action.

I'm looking for suggestions before I jerk it out of the case to begin
troubleshooting.

Thanks for any help.

Mike KL7CD
Dallas-Ft. Worth