[Hallicrafters] FW: SX-101A

[roy.morgan at nist.gov]

Quoting "Langston, Mike" <MLangston at HCPRICECO.com>:

> (The SX-101)has this "problem". ... like a steady pulsing
> interruption to the signal, ...with a steady carrier or by turning on the
calibrator it is very noticeable. The interruption is very short

Mike,

Take the antenna off and run the calibrator to see if it isn't some noise pulses
coming from outside the radio.

If it's inside the radio, see if it happens with agc OFF. If not, it may be some
cap in the AGC system shorting out in a periodic way.

Put the radio on a variac and see if the effect is less or goes away on lower
line voltage.  If so, suspect some cap, possibly a bypass cap or silver mica.

Roy


Roy Morgan
13033 Downey Mill Road
Lovettsville VA 20180