Search found 16 matches

by n9lhm
Wed Jan 02, 2013 2:09 pm
Forum: From the Trenches
Topic: Trade ya War Stories, Fossil
Replies: 50
Views: 13000

Re: Trade ya War Stories, Fossil

I had a lot better luck with the 20's then you did. Took care of a 5E and two 20Es at different stations. Never had a cavity problem with them. They were great units. What was so difficult about tuning them? You could do a tube change in five minutes, carrier off to carrier back on, and tune them up...
by n9lhm
Fri Mar 02, 2012 3:07 pm
Forum: From the Trenches
Topic: Trade ya War Stories, Fossil
Replies: 50
Views: 13000

Re: Trade ya War Stories, Fossil

Now my turn. Huh? Re-word this. Every time the lights flickered the transmitter would go BANG. The recliner was sitting in front of the transmitter. Tower guy asleep in recliner. Power up there was real bouncy back then. Many miles of 4400 volt line. Now ugraded to 34.5 kv. Back when there were tra...
by n9lhm
Thu Mar 01, 2012 4:00 pm
Forum: From the Trenches
Topic: Trade ya War Stories, Fossil
Replies: 50
Views: 13000

Re: Trade ya War Stories, Fossil

Probably not, they were inside the API panel meter(s) on the front panel. I took care of several of those transmitters, both FM and TV, and never had an ambient light issue like that.

Now on Harris transmitters with arc detectors, I did :)
by n9lhm
Thu Mar 01, 2012 10:39 am
Forum: From the Trenches
Topic: Trade ya War Stories, Fossil
Replies: 50
Views: 13000

Re: Trade ya War Stories, Fossil

"On the BTF there's an open spark gap on the choke's terminals. Gives any extra energy from power surges someplace to go other than the rectifiers or the PA ."

Yeah, well, I know that, but why does a "light flickering from a recliner" set it off? :)
by n9lhm
Wed Feb 29, 2012 3:57 pm
Forum: From the Trenches
Topic: Trade ya War Stories, Fossil
Replies: 50
Views: 13000

Re: Trade ya War Stories, Fossil

"Every time the light flickered it went BANG across the PS choke." Huh? Back in the REALLY old days (RCA TTU-12) before OSHA, the factory recommended procedure to check the thyratrons was to wrap a piece of #30 wire around the end of the God Rod and, with the HV on, take it and touch the HV connecto...
by n9lhm
Fri Feb 17, 2012 1:16 pm
Forum: From the Trenches
Topic: Telephone abuse
Replies: 4
Views: 2218

Re: Telephone abuse

<sigh> That's what the handset cords look like at my house after my wife gets off the phone............ :D
by n9lhm
Wed Sep 21, 2011 2:26 pm
Forum: From the Trenches
Topic: The high leg
Replies: 14
Views: 3291

Re: The high leg

I absolutely HATE high leg delta three-phase service. It is an accident looking for a place to happen. It should have never been allowed, IMHO. Brian
by n9lhm
Wed May 04, 2011 11:10 am
Forum: FM Radio
Topic: Harris 25K
Replies: 23
Views: 3096

Re: Harris 25K

I worked on one once that someone else had been into..... that had lost several screen blockers. Replaced it once more and checked the safety gap and found it a lot wider than spec. Reset it and have not heard about it happening again. Might want to look at it. I can't remember what the gap spec was...
by n9lhm
Fri Apr 01, 2011 9:33 am
Forum: FM Radio
Topic: Any RCA BTF-20E1 experts in the house?
Replies: 5
Views: 1372

Re: Any RCA BTF-20E1 experts in the house?

Most of the LV breaker trips I saw in 20E's were when tubes were getting tired and the screen supply was being run higher than normal to get more out of them. Maybe that's what was happening, and someone suspected the caps were bad.
by n9lhm
Fri Apr 01, 2011 6:00 am
Forum: FM Radio
Topic: Any RCA BTF-20E1 experts in the house?
Replies: 5
Views: 1372

Re: Any RCA BTF-20E1 experts in the house?

Yeah, I remember "de-pcb-ing" the whole transmitter site I was working at in the late '80's (WSBT AM-FM-TV). I never did hear what the total tab was but it was a lot :). Maybe the inrush on those caps was enough to trip the low voltage breaker. That wouldn't show up with an ohmmeter test. Maybe try ...
by n9lhm
Wed Mar 30, 2011 1:53 pm
Forum: FM Radio
Topic: Any RCA BTF-20E1 experts in the house?
Replies: 5
Views: 1372

Re: Any RCA BTF-20E1 experts in the house?

Are they defective? Its a three phase supply if I remember right, so it could run without them without too much AM noise, but definitely not optimum. I used to take care of a number of E line FMs -- you can call me at WNIT at 574-675-9648 x315 if you want to talk further, or e-mail n9lhm at yahoo do...
by n9lhm
Fri Nov 19, 2010 10:48 am
Forum: AM Radio
Topic: Nautel Ampfet 50
Replies: 8
Views: 1480

Re: Nautel Ampfet 50

Deep Thought wrote:Thanks Jeff. Looks like I'll be trying to get him to buy a J-1000 for the 350-watt nighttime operation... :mrgreen: I think it would be neat to run the 5kw into a power divider and load bank of incandescent bulbs. 4,650 watts of light. Put up a billboard or something and watch it...
by n9lhm
Thu Nov 04, 2010 6:46 pm
Forum: FM Radio
Topic: TFT 730 SCA Monitor info
Replies: 0
Views: 548

TFT 730 SCA Monitor info

Need a book/schematic for a TFT 730 SCA monitor........ anyone have one laying around somewhere or know where I might find one?
by n9lhm
Mon Oct 18, 2010 11:17 am
Forum: FM Radio
Topic: RCA Type BW 85A monitor
Replies: 1
Views: 637

Re: RCA Type BW 85A monitor

This is the stereo part of the BW-75/85/95 series, right? I believe the original Belar model that it was the rebadged version of is an FMS-1.
by n9lhm
Thu Sep 02, 2010 6:24 pm
Forum: FM Radio
Topic: SCA generator needed
Replies: 0
Views: 647

SCA generator needed

One of my NCE clients wants to add an SCA. We're looking to find a stand-alone 67KHa SCA generator to drive a Crown exciter. A Mod Sciences Sidekick or similar unit with the processing built in and matched to the generator would be ideal. If anyone has one they'd like to get rid of you can write me ...