Bad news today....KMSU TV Springfield, MO. lost an 1,891 ft twr today. Twr crew on twr at about 105 ft level when it went down Fox News reporting one dead several injured with non life threatening injuries. Report states they were working on tower.
Fossil
Search found 1426 matches
- Thu Apr 19, 2018 12:38 pm
- Forum: Broadcast Engineering News
- Topic: Tower Collapse near Springfield MO
- Replies: 1
- Views: 141
- Thu Apr 12, 2018 6:24 am
- Forum: FM Radio
- Topic: FM3.5 odd problem
- Replies: 9
- Views: 313
Re: FM3.5 odd problem
It's "day juh view all over again"!!!! Our FM-3.5K just blew a solid state relay on the plate ckt. This rig is a later version with a mechanical contactor. We got hit two days ago with a weird power surge that somehow affected the plate current metering circuit. While two other guys were working on ...
- Wed Apr 11, 2018 6:30 am
- Forum: FM Radio
- Topic: FM3.5 odd problem
- Replies: 9
- Views: 313
Re: FM3.5 odd problem
Well done. That one goes in the notes for the one I work on.
Fossil
Fossil
- Tue Apr 10, 2018 6:27 am
- Forum: FM Radio
- Topic: Omnia FM HOT OS
- Replies: 8
- Views: 292
Re: Omnia FM HOT OS
Ahhhh, yessss-------I remember the NAB. Sore back, sore feet, hardly a chance to get lunch. 16 hour days. Actually, it was a bit of fun in spite of the pain.
Fossil
Fossil
- Mon Apr 09, 2018 1:10 pm
- Forum: FM Radio
- Topic: FM3.5 odd problem
- Replies: 9
- Views: 313
Re: FM3.5 odd problem
This is a real big SWAG!
Take a board, a real dry one, and lift the HV filter choke completely off ground to see if it will stay on. Totally insulate it from ground. It could also be something breaking din in the plate xfmr. But definitely do the filter choke test first.
Fossil
Take a board, a real dry one, and lift the HV filter choke completely off ground to see if it will stay on. Totally insulate it from ground. It could also be something breaking din in the plate xfmr. But definitely do the filter choke test first.
Fossil
- Sun Apr 08, 2018 8:18 am
- Forum: FM Radio
- Topic: National over Eimac or Econco
- Replies: 20
- Views: 613
Re: National over Eimac or Econco
Don't recall if I ever posted this before..... Installed a Harris HT-5 waaay back in the early 90's. First factory new tube lasted well over 38,000 hours. Second tube - a rebuilt - lasted a year, third lasted back up in over 25,000 hours. Recent years, life has been pretty good with rebuilts. Lately...
- Fri Apr 06, 2018 6:45 am
- Forum: FM Radio
- Topic: National over Eimac or Econco
- Replies: 20
- Views: 613
Re: National over Eimac or Econco
Yuppers, that's the one. They transferred the manufacturing process to another state, but somehow there was some slight of hand technique - unwritten - of course, that didn't get to the light of day and xmttrs were blowing up all over the country. Some lasted a whole 8-12 hours after tube change, so...
- Fri Apr 06, 2018 6:40 am
- Forum: AM Radio
- Topic: GATES ONE IRF-350 REPLACEMENT
- Replies: 9
- Views: 493
Re: GATES ONE IRF-350 REPLACEMENT
Chuck: The old metal TO-3 case version is what Jon is working on for the mod to the TO-3P. It's pretty simple as he explained it. Not having worked on any of the GATES ONE series, I was not aware of the three different versions of devices they had used. As soon as he gets the biasing and mounting do...
- Thu Apr 05, 2018 8:49 am
- Forum: FM Radio
- Topic: National over Eimac or Econco
- Replies: 20
- Views: 613
Re: National over Eimac or Econco
I just got a wake up call two days ago with replacement of a 4CX3500 in a Harris FM-3.5K. Long story short, we were getting some really strange stuff with a 1.5 year old ECONCO still making plenty of power, but had some spurs. Swapped it out with a Chinese jug which didn't want to go in socket witho...
- Thu Apr 05, 2018 8:12 am
- Forum: AM Radio
- Topic: GATES ONE IRF-350 REPLACEMENT
- Replies: 9
- Views: 493
GATES ONE IRF-350 REPLACEMENT
For those of us needing these transistors for a GATES ONE, a possible replacement has been located . Mouser part number 512-FQA13N50CF. It is a TO-3P case. Expensive price of $0.88 per unit in 100 qty, or thereabouts. My engineer buddy says that there will be some changes needed in the biasing, and ...
- Thu Mar 22, 2018 12:02 pm
- Forum: TV Engineering
- Topic: Transmitter Nitrogen Issue
- Replies: 25
- Views: 459
Re: Transmitter Nitrogen Issue
Whoops! Just remembered another issue. We had a site where the tanks were going empty pretty fast and found the leak was caused by a bad fitting that attached the regulator to the nitrogen tank. Check that fitting to see if it is grooved, or deformed. Don't over tighten as the nitro tank is steel, a...
- Thu Mar 22, 2018 11:58 am
- Forum: TV Engineering
- Topic: Transmitter Nitrogen Issue
- Replies: 25
- Views: 459
Re: Transmitter Nitrogen Issue
I find that using a kids bubble liquid works really good as it is fairly viscous, and really makes good bubbles. Saw yesterday KMART had a basket full going for a buck each.
Get an empty spray jug like an old Windex bottle and put the bubble solution in that.
Fossil
Get an empty spray jug like an old Windex bottle and put the bubble solution in that.
Fossil
- Fri Mar 16, 2018 6:36 am
- Forum: AM Radio
- Topic: GatesAir suspends AM TX sales (Radio World)
- Replies: 25
- Views: 773
Re: GatesAir suspends AM TX sales (Radio World)
I think I heard some ground rumbling in Quincy---Parker Gates must be rolling over in his grave! :( My. how times have changed. Good thing there are still two decent am xmttr brands out there------Nautel and BE. And thanks to Mike Patton for his contributions on updates for the SX series, not to men...
- Thu Mar 15, 2018 9:06 am
- Forum: FM Radio
- Topic: HT-5 plate off problem
- Replies: 10
- Views: 322
Re: HT-5 plate off problem
I second the suggestion of the controller board, Got an FM3.5K that had a plate off inop. On that rig there is a board vertically mounted at the back of the controller area. Replaced it and it's happy. BTW, the 3.5/5k is the early predecessor to the HT series. Quite a few common parts. I think the H...
- Sun Feb 18, 2018 11:25 am
- Forum: Ask the Engineers
- Topic: Band stop-Notch Filter suggestions
- Replies: 9
- Views: 281
Re: Band stop-Notch Filter suggestions
Second that suggestion for U-wave Filter Co. Have used their product for FM receiver issue.
Fossil
Fossil