DeVerm;350323 Wrote: > like AM modulation transformers where the primary winding carries the > full power supply to the modulated stage? In a past life I was a broadcast engineer. All of the older AM broadcast transmitters I remember, most were Collins, did NOT pass the DC current to the final RF stage through the modulation transformer; there was a blocking cap in series with the secondary. The DC was passed through a separate choke (or, as it was called, "modulation reactor", which blocked the audio from being shorted to ground by the filter caps in the power supply.
I had the most years of experience with a Collins 21A 5KW transmitter at WBAA radio. The modulation transformer (a Thordarson "True Fidelity" model) and modulation reactor were so big and heavy that they sat, along with the 3 power transformers of the 3 phase 8.8KV plate supply, in a small room with interlocked doors behind the transmitter cabinets. -- Timothy Stockman ------------------------------------------------------------------------ Timothy Stockman's Profile: http://forums.slimdevices.com/member.php?userid=8867 View this thread: http://forums.slimdevices.com/showthread.php?t=53345 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
