[Boatanchors] NC 173 BFO

[Morris Dillingham]

How about the injection?  I don't know about the NC173 but some old rigs
used a gimmick to inject the BFO.  It would be short wires loosely wrapped
or even just in close proximity as a gimmick capacitor.  The BFO could be
oscillating but not getting to where it does good.

         73 de KI4IUA 
         Morris   


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Troglodite at aol.com
Sent: Tuesday, June 28, 2005 12:20 PM
To: w6om at cox.net; boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] NC 173 BFO

Ron,
 
There are a couple of possibilities. Assuming you have already checked the  
coil and it is good, I would look very carefully at the capacitors you have

replaced around the BFO circuit, and make sure they are all in the right
place.  
Second thing to check is the value of the resonating capacitor across the 
coil,  if you have replaced it. Sometimes reading the values on those old
Black  
Beauties or Mica caps is a challenge. It could be that the BFO is
oscillating 
-  but way off frequency. Check it with a scope or grid dip oscillator in
the  
wavemeter mode. Good luck.
 
Doug Moore
 
In a message dated 6/27/05 7:47:51 PM Central Daylight Time, w6om at cox.net  
writes:

>Restoring a NC 173, re-capped it, replaced the usual items and  tubes but 
cannot get the >BFO to work.  Looked at the schematic until I  am cross
eyed, so 
perhaps I am missing >something. Anyone have a similar  experiance or 
suggestion of where to dive in?
 
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