[BC] RE: WMOXThump

[Charles Wooten NF4A]

"Ping" ....some of you may remember the Browning "Twins" in the old tube
type CB days....separate receiver and transmitter matched set. "The CBer's
S-Line".... When you pressed the PTT, you got momentary feedback from the
receiver's speaker into the transmitter's microphone before the receiver
muted, which sounded like a ping....just a little "ping trivia"

Charlie Wooten
Clear Channel Radio 

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Howell, Matt
Sent: Tuesday, October 11, 2005 6:24 PM
To: broadcast at radiolists.net
Subject: Re: [BC] RE: WMOXThump

My BE 5kw solid state makes a cool "bing" on the air at power up. Makes
momentary power glitches fun!




Matt Howell
Director of Engineering
Clear Channel Sarasota
941.552.4818 vox
941.552.4918 fax
Matthowell at clearchannel.com
----------------------
Sent from my BlackBerry Wireless Handheld thingy

-----Original Message-----
From: broadcast-bounces at radiolists.net <broadcast-bounces at radiolists.net>
To: broadcast at radiolists.net <broadcast at radiolists.net>
Sent: Tue Oct 11 18:10:17 2005
Subject: [BC] RE: WMOXThump

Dave,
You are correct, the thyratron supply was one of the only designs I found
that gave that "thump" at carrier on. The old RCA board that was there was
all tube type and was never turned off.
  GE made a similar supply but I don't know of any of those that made it
into the MW band.
The thyratron supply was a rather short lived incarnation of three phase
rectification as I suppose that after a few rounds of trouble-shooting and
improvements in the mercury vapor rectifiers for inverse standoff that
"design" drifted into oblivion.
Willie, the "thump" did not originate in the audio chain, as many times I
brought it up with the audio patched out. And it was far more prevalent on
low voltage as the transmitter was configured as 1-10kw. On low power the
thyratrons triggering time was staggered somewhat as a switching supply is
now.



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