[drakelist] DRAKE R-4C (4-NB Noise Blanker)

[STEVE SCOGGINS]

STEVE SCOGGINS <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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I have a Drake R-4C receiver with the 4-NB noise
blanker that is not working.

I have the 4-NB manual with schematic from the bama
website.

There is no receiver audio when switched to NB
position.  Using a scope I can see that the 7.935 Mhz
oscillator in the NB is oscillating. Perhaps the FETs
are blown in the NB. 

Does any one have a parts layout and theory of
operation for this NB. This type of info. would be
useful for troubleshooting.

73 Steve KE7RR




      
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