[BC] FM Exciters (Pic's)

[DHultsman5@aol.com]

In a message dated 2/25/06 10:18:58 A.M. Central Standard Time,  
mark3xy at gmail.com writes:

That is  one of the more polite names for it.
> Then there was the TE-1 which  mostly didn't
> work at all. (circa 1968) There were many
> names  for it, but IIRC TE-1 was only used
> in company  literature.



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I think I heard from Hardin Stratman the engineer guy on the TE-1,   That 
"TE" stood for "transmitter Exciter"  The biggest problem with the  TE-1  before 
Jack Sellmeyer did the TE-3 design and upgrade was that it  would unlock and 
move around the band with modulation.
 
One of the reason that the FM20H3 and later FM20K series had an underdrive  
relay.  They found the tuned circuit in the driver and installed a relay  that 
would pull in with drive from the TE-1.  The relay was in the  interlock 
circuitry of the plate supply.  If the TE-1 exciter went off  frequency the voltage 
at the tuned circuit would drop out the relay as the  exciter went up or down 
away from operating frequency off went the plate  voltage.  Sometimes it 
would come back on frequency and the plates would  come back on and then drift off 
again.
 
In the early models of the 20 kW. before the under drive relay, when the  
TE-1 would go off frequency the PA would heat up until the components broke  
down.  The trombone tuning section would all have to be replaced.
 
Dave Hultsman
been there