[BC] CCA still Low modulation CHanges made

[Lewis Munn]

Bob,
   
  Correct me if I am wrong.
   
  You can determine if it is shorted, or open, or "about right" with an ohmmeter.
   
  My concern was that if the plate current is normal for a "typical" 1KW transmitter...i.e. about 500 mA, 900 ohms would be dissipating about 225 watts in the choke,. which would be enormous.  And earlier, if the choke is nearly shorted, it would be feeding the audio to ground and overloading the modulator tubes, hence the plate material being evaporated to the envelope in the one modulator.
   
  I agree that a more ideal way would be use of an inductance bridge for value and Q, and resistance checks both of the winding and to the core and mounting for making sure of no obvious "other" paths.  Possibly even a HiPot check
   
  Sticks in my mind the usual modulation chokes I have looked at quick and dirty had 20-50 ohms of resistance.  But, like you, long time ago.
   
  Thanks for calling quick and dirty troublehooting to account vs precise analysis!
   
  Looey Munn
  Roundup, MT
   
  
Bob Groome <bobgroome at yahoo.com> wrote:
  Just in case.....

You don't measure a modulation reactor's value with an ohm meter.

			
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