[R-390] R390 not A calibrator issue

[Jacques Fortin]

Hi John,

Your sentence: I get a strong, reasonable looking 100 kHz sine wave out on
the scope....
Made me tilt...
Where and how (what type of probe) did you measure this 100kHz sine wave ??
Normally, the output of the calibrator SHOULD NOT be a sine wave: it is
usually a weird, peaky waveform, on purpose.
Because that waveform have to contain all the even and odds harmonics up to
the 300th, at least.
More the waveform looks like a "perfect" sine wave, less harmonics it
contain.
The receiver problem can be also the C226 that is open, or been removed by
someone...
Not sure you will escape a trip inside the RF deck for long...
BTW, which manual are you using ? The TM 11-5820-357-35 ??
You can see in the first pages that there is a lot of changes needed to
bring the RF deck up to the MOD 4 status.

73, Jacques, VE2JFE