From: Stephan Sever 
Subject: [drakelist] R-4 Noise Blanker


Stephan Sever  made an utterence to the drakelist gang
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This is my first posting to the drake list, hope I get
it right! I am having a problem with an R-4 receiver
in the noise blanker. The receiver has had a full
alignment done, and is working very well except when
the noise blanker is turned on. Signal strength is
reduced considerably and the incoming signals are very
distorted, the same effect as if the blanker threshold
was up too far. By doing some signal tracing with a
scope it seems the NB is working but is being
overdriven (for lack of a better term). All
resistances check good, but upon doing a voltage check
I had about +3V on pin 1 of V3 (12be6) instead of -11V
as the manual called for. I found C62 
(12 pf) was open, but after changing it the voltage is
now at -.7V or so, not -11V. Still doesnt seem like
enough negative bias on V3 and the noise blanker still
isn't functioning properly. If anyone has any
suggestions or have had this problem before I would be
happy to hear from you. Many thanks and 73
                           Stephan Sever II  KG9BV


	
		
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