Thread: Plessey PR155
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Old July 5th 05, 07:49 PM
Andrew Holme
 
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Uncle Peter wrote:
Does adding a good ground to the chassis
eliminate the hum, or lessen it? Are the mains lines
bypassed to the chassis in the radio?


The mains lines are bypassed to the chassis - right behind the power inlet
socket. I probed around this area, after seeing Scott's second post, but
all seemed to be in order.

It is not unusual for the mains to become part of the antenna
counterpoise, which under some circumstances can impose
a AC line frequency modulation on the received carrier.


The phase modulation is on the local oscillator - never mind received
carriers.

Thanks,
Andrew.