Search found 905 matches

by ChuckG
Sat Oct 04, 2008 10:02 pm
Forum: Ask the Engineers
Topic: Telephone line hum
Replies: 13
Views: 1440

Re: Telephone line hum

Those boxes that grab audio off of the handset cord- not all PBX handsets are wired to the old phone company standard, you could well be tapping across the wrong pair or perhaps tied across both. Some have fairly filthy DC on them to operate the receiver in the handset as well. Might have to open it...
by ChuckG
Wed Sep 17, 2008 9:55 pm
Forum: AM Radio
Topic: FSA (a rant of sorts)
Replies: 33
Views: 2821

Re: FSA (a rant of sorts)

Heh...the light bulb over the transmitter runs higher power than the transmitter... WRPQ once was blessed with a Vanguard II. 250 watts output with about 2 KW in. Was the II the one that looked like a motel ice chest? oh wait- oversized space heater, that's what it was! :mrgreen: I haven't seen WRP...
by ChuckG
Wed Sep 17, 2008 7:59 pm
Forum: FM Radio
Topic: new at this game , would love to get some help
Replies: 13
Views: 1849

Re: new at this game , would love to get some help

Ah, yes - QEI. I got an older 5kw FM here in Racine that has really been a solid dependable rig. We typically get over 35,000 hours out of the jug. But, and there is a but - - -I remember the first pa tube change I did on it. Pulled the old jug out and prepared to insert the new one. Next thing I k...
by ChuckG
Wed Sep 17, 2008 7:55 pm
Forum: AM Radio
Topic: FSA (a rant of sorts)
Replies: 33
Views: 2821

Re: FSA (a rant of sorts)

With older transmitters that's the proper way to do it. Most are not type-accepted down to lightbulb power and they sound like crap. I had a RCA BTA1R down to 54 watts PSSA on 580. The pad was big, but not unwielding. It had about 15 mile coverage and sounded good. Low end of the dial is much bette...
by ChuckG
Wed Sep 17, 2008 7:50 pm
Forum: Everything else
Topic: Xmtr site vacuums
Replies: 25
Views: 1740

Re: Xmtr site vacuums

Chuck- I can give you a great deal on a TE-3 if you miss them that much! :twisted: I have a fine specimen inside of an FM20H3 in the garage in Baraboo. I think it even has the "Optimod" card that prevented PLL unlocks with the Optimod 8000. I may just throw it in the back of the truck for weight th...
by ChuckG
Tue Sep 16, 2008 3:52 pm
Forum: Everything else
Topic: Xmtr site vacuums
Replies: 25
Views: 1740

Re: Xmtr site vacuums

w4cl wrote:OOOOOOHHH! That is an OLD rig. I didn't know any of those were still around.
I know of 2 still in 24/7 service as mains. Less the TE3 exciters, thankfully.
by ChuckG
Tue Sep 16, 2008 3:51 pm
Forum: Everything else
Topic: Xmtr site vacuums
Replies: 25
Views: 1740

Re: Xmtr site vacuums

I recall seeing some data on an oil check on a mod xfmr that was tested many years ago. It was determined that the level of PCB was so minute that the owner didn't have a problem. Bob Mod transfomer in a BC5H was the exact opposite. The testing lab actually gave me a phone call wanting to know what...
by ChuckG
Mon Sep 15, 2008 12:16 am
Forum: FM Radio
Topic: new at this game , would love to get some help
Replies: 13
Views: 1849

Re: new at this game , would love to get some help

For QEI, I LOVE the sharp aluminum edges in the PA cavity that cause arcing, or the use of PL259 connectors for the IPA cables to the PA which burn up because there is too much power running through a low band connector. Those same sharp aluminum edges are present in the harmonic filter with the sa...
by ChuckG
Sun Sep 14, 2008 11:50 pm
Forum: AM Radio
Topic: FSA (a rant of sorts)
Replies: 33
Views: 2821

Re: FSA (a rant of sorts)

With older transmitters that's the proper way to do it. Most are not type-accepted down to lightbulb power and they sound like crap. I had a RCA BTA1R down to 54 watts PSSA on 580. The pad was big, but not unwielding. It had about 15 mile coverage and sounded good. Low end of the dial is much bette...
by ChuckG
Wed Sep 03, 2008 9:46 am
Forum: AM Radio
Topic: FSA (a rant of sorts)
Replies: 33
Views: 2821

Re: FSA (a rant of sorts)

Welllll...... They weren't there at sunset any other day that week, and they disappeared shortly after returning to "normal" programming following the football game. So I'm not buying accidental overpower operation for a second. Sorry. You may well be correct, I'm not an employee and have no knowle...
by ChuckG
Tue Sep 02, 2008 11:15 pm
Forum: Radio Automation Systems
Topic: Automation Poll
Replies: 101
Views: 22727

Re: Automation Poll

The Phantom from Radio Data Systems. A-Ha! Its closest competitor was Rodman Brown's "Desk Jockey". You don't need another headache...you need a desk jockey. That is until you attempted to load a log while the system was doing an on air transition and blew the OS out. At that point you were getting...
by ChuckG
Tue Sep 02, 2008 10:58 pm
Forum: AM Radio
Topic: FSA (a rant of sorts)
Replies: 33
Views: 2821

Re: FSA (a rant of sorts)

far too distant for the WSPT 10 watt nighttime signal to make it here with about 1 mv/m measured skywave. new battery in the SX can do wonders. :? That station accomplishes it's power reduction by throttling the transmitter back to 100W or so and burning 90% of the rest off in a resistive load. Tim...
by ChuckG
Fri Jun 27, 2008 10:17 pm
Forum: AM Radio
Topic: Delta meter
Replies: 5
Views: 1075

Re: Delta meter

Those toroids can develop quite a voltage into an open load. I found that out the hard way, disconnecting the meter without lowering the Xmtr power first. Just sayin.. :shock:

I added a 260V varistor across the diode and another from the input to ground in several of mine. No more blown diodes.
by ChuckG
Mon Jun 16, 2008 12:42 pm
Forum: AM Radio
Topic: Conelrad
Replies: 25
Views: 3779

Re: Conelrad

12-inch poured concrete walls and a 0.39 cent filter from Wards. :shock: In high schools, ducking under your desk was going to save you if they nuked the town. Your government at work. Worried about the nuclear fireball? Here- hide under some kindling. :mrgreen: They must've built those desks out o...
by ChuckG
Mon Jun 16, 2008 12:40 pm
Forum: AM Radio
Topic: Conelrad
Replies: 25
Views: 3779

Re: Conelrad

OMG!!!! You know about WJMS???? I used to be a part time YOOPER, having a place at Powderhorn. Shoot ya hey der. Donja get me a beir one time? Kryminee! (or how ever you spell it) WJMS (if I remember right) was on 590. I head about their oldest on the planet" audio board. Bet that was a SPECIAL fil...