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Author Topic: What AM tower is this (Paul G. Thompson or anyone?) Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 10-17-2003 04:54 PM                  The 833A & 833C also make one hell of an oscillator for a tesla coil... YIKES! >>> Phil  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 10-18-2003 01:20 AM                        Paul... ITA built a good-looking 5kW transmitter that used a pair of 4-1000 tubes to modulate a 3CX2500F3 final. It had it's hv iron in a separate box. Do you know of this transmitter... and is it anywhere around the same vintage as your 1kW???  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 10-18-2003 01:06 PM                     Jack, I never saw the ITA 5KW rig. Ours is an AM500/1000 box. It dates back to 1962. Here is a picture of the ITA: Here is a book picture picture of what I have for the 10KW transmitter. This is what I actually have in the transmitter room. Timeline for Collins: The Collins Radio Company was founded in 1932 by Arthur A. Collins* at Cedar Rapids, IA. It was famous for producing high quality transmitters for amateurs, the military and the broadcast industry. Under the Collins label also came some of the most popular consoles and cart machines used by radio stations. Dave Hultsman recalls that "Collins first sold FM transmitters from 1947-1958, but found little demand. They then sold ITA transmitters with a Collins logo for a few years, before building the 830 series in the early 1960s. The ITA tetrode transmitters were very unstable in the PA stage. Neutralization was a major problem. That is probably why Bernie [Wise] went to Juan Chibrando's grounded grid triode design at CCA." Collins reduced the neutralization problem by grounding the screen in the 830 and 831 series. In 1964, Collins moved the Broadcast Division from Cedar Rapids to Dallas, TX. Among the first products was the 820 series of AM transmitters, designed to meet new FCC regulations regarding the need to contain harmonics and spurious emissions inside the transmitter. In the mid 1970s, the 831 series was produced, the first model being a 2 kW, 831-D, to take advantage of adding vertical polarization. In 1977, Collins Radio Co. was bought by Rockwell and moved to Dallas, TX, as Rockwell-Collins. On October 1, 1980, Rockwell spun the Collins Broadcast line off to Continental Electronics. [ 10-18-2003, 07:20 PM: Message edited by: Paul G. Thompson ]  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 10-19-2003 12:42 PM                        Paul... Same series. The 5kW also had that metal door handle with the control buttons in it. Iron was in a box separate box about 1/3 the size. Aside from the cost of the 4/1000 mods, which couldn't be rebuilt , the transmitter was a decent box. I put a CRL processing package on one, and it handled it fine... plenty of headroom for aggressive processing. Oh... talk about your 4-400s glowing... those 4-1000s.... wow!  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 10-19-2003 02:58 PM                  Paul, that ITA looks really cool. Jack, I agree it's ALL about the glow! >>> Phil  |  IP: Logged Luciano Brigite Master Film Handler Posts: 277 From: Sao Paulo, SP, Brazil Registered: Jan 2002 posted 10-19-2003 03:01 PM                     That ITA transmitter looks like my fridge ( too bad the fridge doesn't have the glowing things inside) The Collins looks neat.  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 10-19-2003 07:47 PM                     Yeah, Luciano. I might come up with an old 1KW AM Transmitter and give it to Josh. He was mumbling something about making a refrigerator out of one, using the meters as temperature gauges. I thought the idea was funny as hell, but it does have some merits. It would be unique, that's for sure. It is just an issue on how his mom and dad would take to a 1,000 lb box sittin' in the garage. But his parents are great people, so they would probably go along with it...maybe. Hey, Josh...let's build a Tesla coil like Phil posted. I can get another 833. I have another one sitting at the station. Phil, do you have the specs on those things?  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 10-19-2003 08:32 PM                  Paul, I'll email you the schematic and parts list...give me a few days to pull it all together... While the "spark-gap" ones sound really cool and are "scary", the 833/811 ones run quiet. I like the spark-gap ones better! Also, I have a 0.5kW FM xmtr here in my house that I run...on and off for a show that I do. I want to carry KVXL to all of Hollywood...but... >>> Phil Corrected typo... [ 10-20-2003, 07:16 AM: Message edited by: Phil Hill ]  |  IP: Logged Luciano Brigite Master Film Handler Posts: 277 From: Sao Paulo, SP, Brazil Registered: Jan 2002 posted 10-20-2003 02:30 PM                     Aren't the Xenon ignitors suposed to be a smal lversion of a tesla coil? the ones I make seems just like that.. That's the first time I see a tesla running on tubes. Speaking of tubes ... *sigh* I'll have to go back to the beginning of everything.. I just got my hands on a copy of the RCA RC25 tube manual and while reading some of the stuff in there I realized that at least half the stuff I laid down on the paper isn't very right.. and later while looking for more info about output transformers I found out that all the darn math I use to find out core size, winding's turns and all that is only for SE transformers, and about all the (now wrong)schematics I did are for PP ( and a strange one for PP-P) .. ah Anyway... I don't know everything.. I'll never know everything..  |  IP: Logged Jason Burroughs Jedi Master Film Handler Posts: 654 From: Allen, TX Registered: Jun 99 posted 10-20-2003 02:48 PM                     The Dallas Collins facility was acutally in Richardson part of what is now called Telecom Corridor, just north of Dallas. The buildings were later sold to Alcatel in the early 90's. Alcatel has since moved out and the buildings sit mostly vacant. They had one interresting building that had two "pods" on each side, with equipment to connect to trucks that had transmission eqipment on them, for testing purposes. The building was pretty well insulated for RF. Radios inside got VERY poor reception.  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 10-20-2003 03:51 PM                     I'll see if I can find photos of the transmitter that Art Bell has installed in his station KNYE FM.  |  IP: Logged Jack Ondracek Film God Posts: 2348 From: Port Orchard, WA, USA Registered: Oct 2002 posted 10-20-2003 07:38 PM                        quote: ...from Phil.. I have a 0.5kW FM xmtr here in my house that I run...on and off for a show that I do. Ahhh.... then you'd be a pira....er.... experimental broadcaster then, eh?  |  IP: Logged Matthew Bailey Master Film Handler Posts: 461 From: Port Arthur,TX Registered: Sep 2000 posted 10-20-2003 10:00 PM                     Not really. I have a photo of a Raytheon/Penta Labs PL-254w transmitter tube.. It has four pins on the bottom, one connection at one side, & another at the top.  |  IP: Logged William Hooper Phenomenal Film Handler Posts: 1879 From: Mobile, AL USA Registered: Jun 99 posted 10-21-2003 12:35 AM                        Is that the tube the judge said that they could pull out of that lady in Florida?  |  IP: Logged Sam Hunter Jedi Master Film Handler Posts: 779 From: West Monroe, LA, USA Registered: Jan 2002 posted 10-21-2003 12:36 PM                     What was that am radio station somewhere right across the border in Mexico that had was so big they had to clean the carbon off the pa tubes or something. Damn its been a long time ago since I heard about that and don't recall all of the story. It was 100000 watts if I remember right. I just don't remember.  |  IP: Logged

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