Search found 31 matches

by ncradioeng
Wed May 09, 2018 11:50 am
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 41
Views: 870

Re: RX-only C-band receive station registration, form 312

Looks like people are registering - from the Daily Digest 9 May 18 :

https://transition.fcc.gov/Daily_Releas ... 0627A1.pdf
by ncradioeng
Fri Apr 27, 2018 2:29 pm
Forum: AM Radio
Topic: DX50 air flow switch
Replies: 8
Views: 226

Re: DX50 air flow switch

It had a pizo buzzer that would squeal it's little heart out if the flushing fan quit and IIRC was only mentioned in an addendum or service bulletin. Yes it would - and shut off the transmitter. I had to re-cap several of those to stop squirrelly operation. Also a chronic dust bunny will act as ins...
by ncradioeng
Thu Apr 05, 2018 9:20 am
Forum: AM Radio
Topic: GATES ONE IRF-350 REPLACEMENT
Replies: 9
Views: 544

Re: GATES ONE IRF-350 REPLACEMENT

Can't you use the IRFP350PBF as a replacement? The PBF means lead-free, I think.

https://www.mouser.com/ProductDetail/Vi ... GH8qqok%3d
by ncradioeng
Sat Mar 24, 2018 8:03 am
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 41
Views: 870

Re: RX-only C-band receive station registration, form 312

3.7 - 4.2 GHz. I think most of the AT&T land-based microwave channel and modulation specs carried over to the satellite transponder specs. It was all about making phones calls back then.
by ncradioeng
Fri Feb 16, 2018 11:17 am
Forum: Ask the Engineers
Topic: Schematic Needed
Replies: 12
Views: 343

Re: Schematic Needed

I have the manual and it does not have a schematic.
by ncradioeng
Sat Jan 27, 2018 8:45 am
Forum: FM Radio
Topic: Connector suppliers....
Replies: 14
Views: 630

Re: Connector suppliers....

The cable is AVA5-50FX. According to the Commscope website, this cable is not available in the US and Canada, but it showed up at my project several years ago.
by ncradioeng
Thu Jan 25, 2018 12:09 pm
Forum: FM Radio
Topic: Connector suppliers....
Replies: 14
Views: 630

Re: Connector suppliers....

Beware of the new Andrew cable - the copper sheath is very thin and you have to be extra careful that you don't cut through it when installing grounding kits. The center conductor is also thin and filled with foam to try to make up for the fragility of the conductors. I would stay away from it.
by ncradioeng
Wed Jan 10, 2018 1:43 pm
Forum: AM Radio
Topic: What is this? A 5 kw Dummy Load or what?
Replies: 22
Views: 2760

Re: What is this? A 5 kw Dummy Load or what?

I was told the the 51.5 ohm value came from early RCA rigid coax line that was made from standard copper water pipe sizes.
by ncradioeng
Thu Jan 04, 2018 10:46 am
Forum: FM Radio
Topic: Tower Painting question
Replies: 13
Views: 674

Re: Tower Painting question

I've had good luck with Rohn or Sherwin-Williams aviation orange and white. The FAA has specifications for the paint.
by ncradioeng
Thu Oct 19, 2017 9:05 am
Forum: Ask the Engineers
Topic: Wanna Play "Guess What's in the Grey Box?"
Replies: 16
Views: 1316

Re: Wanna Play "Guess What's in the Grey Box?"

A box was in the budget at least. Why not use the Endec in/out audio connections if that is what it is?
by ncradioeng
Tue Aug 22, 2017 9:42 am
Forum: AM Radio
Topic: Bleed over
Replies: 7
Views: 1078

Re: Bleed over

Look for a broken or loose ground strap(s) around the combiner and tower - it acts like a bad load on the transmitters and things are getting eat up with RF. This can be verified with the transmitters off and listening to the STL receiver and processor audio outputs - if they are clean then that may...
by ncradioeng
Tue Aug 01, 2017 2:00 pm
Forum: FM Radio
Topic: EAS Antenna Issue
Replies: 13
Views: 1582

Re: EAS Antenna Issue

Translators and EAS monitoring are quickly becoming mutually exclusive.
by ncradioeng
Wed Jul 19, 2017 10:55 am
Forum: Everything else
Topic: You need this
Replies: 22
Views: 2399

Re: You need this

awsherrill wrote:
Tue Jul 18, 2017 4:13 pm
Don't bother unless your house is wired with oxygen-free Romex. And never mind the miles and miles of "ordinary" conductor between your house and the power plant.
They also offer this to get around that:

https://www.moon-audio.com/ps-audio-per ... ant-5.html
by ncradioeng
Tue Jul 18, 2017 2:44 pm
Forum: Everything else
Topic: You need this
Replies: 22
Views: 2399

You need this

by ncradioeng
Wed Jul 05, 2017 2:46 pm
Forum: Radio Studio Engineering
Topic: EAS Issue
Replies: 13
Views: 1606

Re: EAS Issue

On a similar note - After NC installed the Comlabs satellite delivery system for the LP stations, the Sage boxes would not decode the tones coming from the Comlabs computer sound card (the other manufacturers' units worked as I recall). Recording the tones into Adobe Audition and blowing up the wave...