[ARC5] "Curing Chirp in Command Transmitters"

[J Mcvey via ARC5]

Well, when in doubt refer back to the original design parameters. I looked up the 1626 datasheet and I think it answers some of the questions of the Why and how of the MO circuit. 
http://www.r-type.org/pdfs/1626.pdf

So, from what I gleaned from the notes, the circuit was designed to use a fixed DC bias otained from the LV line. I believe that applying AC to the filliments  will affect the MO circuit deleteriously .
a) 60HZ modulation
b) loss of stability due to lack of, or improper bias
c) possible damage shortening the useable life?




On Monday, October 6, 2014 5:07 PM, mac via ARC5 <arc5 at mailman.qth.net> wrote:
 



WAY back in the 1940s when I was a grade school kid my Elmer (WW2 vet  
who ran the local radio repair shop and did general electrical  
contracting in the town) gave me an SCR-274N transmitter with some  
extra stuff in it. Said he got it from Army MARS and that he had  
modified it to get rid of the "chirp" in it.  I remember asking  
something like "what's chirp?" and not understanding much of the  
answer.  Don't know whether or not his modification(s) worked either.  
Anyway though, find it interesting that the problem is still around  
and the discussion is still going on  almost 70 years later.

Dennis D.  W7QHO
Glendale, CA







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