[Milsurplus] FW: [ARC5] Carbon mic pops

[hwhall at compuserve.com]

>“keep alive” current thru the T-4 primary

I did try that one time but I forget the resistance I chose & only tried the one value. The difference didn't impress me but perhaps I should consider trying a range of values & see what happens.
 

 Wayne
WB4OGM

 

-----Original Message-----
From: Hubert Miller <Kargo_cult at msn.com>
To: milsurplus <milsurplus at mailman.qth.net>
Sent: Wed, Nov 30, 2016 10:42 pm
Subject: Re: [Milsurplus] FW:  [ARC5] Carbon mic pops




If it was mine, i’d go with first, a cap as i said, at the mic end of the primary of T-4.
Another thing that occurred to me, that might be as or more effective, is to put a
resistor across the mic to ground, in the range of 1/3 to 1:1 the resistance of the
carbon mic. That way there would be a “keep alive” current thru the T-4 primary
at all times, and any current spike would be diminished.
 
It always kind of blows my mind when i find some detail the designers screwed up
on, but that DID happen. I’m sure all of you have seen commercial radio equipment
with something that makes you think, “Now HOW did they overlook THAT ?? “
 
That RF-triggered CW osc in the Bendix RDF receiver, mentioned here recently,
is one example. Probably the first time the plane flew through a storm of static
and the radio op tried to copy CW, he shouted out, “What the hell is this??”
-Hue  


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