|[AMRadio] 4-400 first made when?|
cemilton at aol.com
cemilton at aol.com
Fri Mar 23 16:09:33 EST 2007
Brad and the group,
My posting said 20J................no such animal to my knowledge. My
age is allowing the thoughts of the 20V2 and the 300J to run together.
I should have said, "the transmitter was a Collins 300J and the upgrade
made it a 20V-2." Now I feel better. I'm reasonably sure we changed
some iron but thats been a long time ago. We did add a Rube Goldberg
designed homebrew solenoid arrangement that allowed use of the power
cutback switch. The station ran 1kw day, and .25kw night. The
transmitter was remotely controlled and if I remember correctly, the
R/C unit was made by RUST, Corp.. I'd suggest getting a schematic of
the 20V-2 and comparing it with the 300J to make your restoration a bit
Funny, I can still remember the Ep , Ip and I (ant) plus the antenna
resistance. 1500v, .225a, .73a and 470 ohms. (.25kw readings)
For the 1kw power setting they were 3100v, .455ma, 1.49a and 470 ohms.
I must have read those meters hundreds of times. We were always wary
of an FCC visit. And we had one or two while I was CE.
Those were the days. Brad, if you were close by I'd volunteer to
assist in bringing the old transmitter back to life. They were
excellent pieces of gear.
Gud luck es 73
From: uvc1 at verizon.net
To: amradio at mailman.qth.net
Sent: Fri, 23 Mar 2007 1:44 PM
Subject: RE: [AMRadio] 4-400 first made when?
I've not researched the 4-400, but I can say for sure we replaced the
4-125's with 4-400's when we upgraded our broadcast transmitter from
.25kw to 1kw around 1961. The transmitter was a Collins, 20J and the
upgrade made it a 20V-2.
73 de W4MIL
Chuck, and the rest of the group,
I have a Collins 300 J basket case (no iron) I am changing it to a
advice on the 4- 400 swap, does anyone have any of the transformers,
not have to be out of a Collins 20v2, just needs to be for 4-400's)
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