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 Post subject: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 1:48 pm 
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Posts: 53
HELLO GANG!

I JUST ACQUIRED A EX AM STATION BC XMTR. CAN SOMEONE TELL ME THE DIFFRERENCE BETWEEN THE DIFFERENT VERSION OF THIS 1 KW TRANSMITTER?

I'VE BEEN LOOKING ON THE NET FOR THE MANUAL AND I'VE FOUND THE 1R1 AND 1R3 VERSION ALTHOUGH IT SEEMS THAT THE 1R2 IS A POPULAR VERSION AMONGST AMERS.

AL (VE2VMS)


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 2:09 pm 
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Location: Liberty, Missorui
Congratulations AL, Good on Ya for saving another piece of big ole Iron. Sorry, no help on the documentation here, but I hope the refurb project is enjoyable, keep us posted please.

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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 2:14 pm 
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Tks!


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 2:41 pm 
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Location: Hidden Valley, AZ
A visit to the forum @ www.amfone.net with your inquiry will most likely get more info.

DDG

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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 4:16 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 19640
Location: Utica, NY 13502 (USA)
Much of my 40+ years as a broadcast engineer was spent, among other things, operating and maintaining a 1R1 and a 1R2 at WTLB(AM), 1310 in Utica, NY. licensed as "alternate main" transmitters. The 1R1 was in use when I was hired in 1968. The 1R2 was purchased new and installed in a new building on the same property. Then the 1R1 was moved to sit beside the 1R2. The station operated 24 hours a day alternating between using one transmitter for 1000 watts day power and the other for 500 watts night power for a month. For the next month, their jobs were reversed, and so on. I must say that these transmitters, properly maintained, proved extremely reliable and provided great sound for this heavily modulated, high-speed, top-40 operation. In 1980, the 1R1 was replaced by a Continental 5kw "Power Rock" when the station had a power upgrade and the 1R2 was kept as an auxiliary transmitter. Both are still in use today.

The only differences I saw between the 1R1 and 1R2 were cabinet color and the fact that the 1R1 had a switching and relay arrangement that re-tuned the transmitter for use in the Conelrad emergency alerting system. The crystal switches were labeled Crystal 1, Crystal 2, and CONELRAD on the 1R1. Switching to Conelrad activated the proper crystal and switched in additional coils to re-tune the driver and PA circuits for the new frequency. Instead of Conelrad, the 1R2 was simply labeled Crystal 3.

I've never seen a 1R3 but, looking at pictures and an on-line manual, it seems that the only difference between it and a 1R2 is the power tubes' observation window in the door is rectangular in the 1R3 while the 1R2's has rounded corners. Also, it seems the 1R3 had a solid-state exciter option.

Here I am back in 1969 dutifully taking transmitter readings which were then required to be logged every half hour. Those were the days.

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Dave


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 4:26 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Morris Plains, N.J. 07950
Dave, love the snazzy sports jacket!


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 7:19 pm 
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Dear Dave,

Thanks a lot to have taken time to write this reply. It is not only very helpful but also very interesting.

I drove 1200 miles in two days to go get this transmitter. It is a bit of a crazy thing but I thouht it had to be done to save it. Actually, it the second saving. The previous owner got it from the AM station closing few years ago ( http://en.m.wikipedia.org/wiki/CJTT-FM )but never put it back on the air. So, it should be in a fairly good state as the station went off the air to switch to FM the next day. Only problem is that the previous owner, in order to move it, dissassembled the different parts. Since then (or then?) the paper tag on the wire harness are gone. Should be some fun to retrace and replug...

73, Al


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 9:29 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3033
Location: Seattle WA US
Found your manual here: http://m.blog.daum.net/myeonghwan6108/6
Weird site, had to download each page as a jpg.....
73,
Chuck

<edit: sorry, its a low resolution scan, not worth your bother...>


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Apr Thu 02, 2015 10:46 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1173
Location: forked river , n.j. , usa
xerox copies of rca manuals available here http://infoage.org/library/


Last edited by steve rosenfeld on Feb Fri 02, 2018 3:55 am, edited 1 time in total.

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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Feb Fri 02, 2018 2:13 am 
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Well aometime has passed but I’m glad to say that the project is going well. Still, I have not find a copy or original manual for the 1R2 version. Here some pics of the ongoing project. Sorry, they are too large. Will post them soon!


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 Post subject: Re: RCA BROADCAST TRANSMITER BTA 1R2 VS 1R1 AND 1R3
PostPosted: Feb Fri 02, 2018 3:24 pm 
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Joined: Jan Mon 28, 2013 9:35 pm
Posts: 991
Location: Santa Rosa, CA
Al,
You lucky dog! I've been looking for an old AM BC transmitter
for a very long time. Preferably an RCA like one of the lower power BTA series.
Finally gave up the quest. Yours is a work of art! Enjoy.
Steve W6SSP

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