Search found 3277 matches

by Deep Thought
Wed May 23, 2018 7:19 pm
Forum: Everything else
Topic: Tomato Soup Incident
Replies: 6
Views: 89

Re: Tomato Soup Incident

I suspect the battery voltage sensing circuit is all confused. Can you get at the battery connection? It may just need some cleaning. Your best bet is pure isopropyl alcohol followed with a clean de-mineralized water rinse followed by a few hours in the oven at around 120°F. If you have PC board cle...
by Deep Thought
Wed May 23, 2018 7:12 pm
Forum: FM Radio
Topic: Compression Question
Replies: 7
Views: 94

Re: Compression Question

You'll make a lot of friends at the station end of things if you deliver them a nice, clean, normalized program file with no unnecessary compression or limiting beyond what you feel is appropriate to produce a professional-sounding product. Keep in mind that almost every station is heavily processin...
by Deep Thought
Fri May 18, 2018 6:18 pm
Forum: Digital Radio
Topic: Monitoring, Day Sequerra Board Repair
Replies: 7
Views: 146

Re: Monitoring, Day Sequerra Board Repair

100% in the digital IBOC realm is all ones. If you try to go over that really *really* bad things happen in the codec. I suspect that anything you see over 100% on the "HD" audio display is overshoots in the decoding. I'll have to scan around the Chicago FM band with my M2 and see if I can find any ...
by Deep Thought
Fri May 18, 2018 8:04 am
Forum: Digital Radio
Topic: Monitoring, Day Sequerra Board Repair
Replies: 7
Views: 146

Re: Monitoring, Day Sequerra Board Repair

I wonder what the FCC uses, by the way, when they investigate overmodulation complaints? Overmodulation complaints? I don't think I have seen a station cited for overmodulation in the last 30 years. They do have nifty equipment...a modified spectrum analyzer/SDR which is also used for interference ...
by Deep Thought
Sat May 12, 2018 9:38 am
Forum: Ask the Engineers
Topic: C-band TI
Replies: 21
Views: 404

Re: C-band TI

Our 1982-vintage UPI and NBC audio dish was 70 MHz second IF. Was kinda fun to tune around on the SCPC carriers with a comms receiver and listen in back then. :)
by Deep Thought
Mon May 07, 2018 8:58 am
Forum: Ask the Engineers
Topic: STL Frequencies
Replies: 12
Views: 267

Re: STL Frequencies

Deep Thought should have current info, and he should respond soon with "the path to enlightenment". :roll: Not sure how enlightening this will be since it has already been answered, but: yes in an emergency, no on a primary basis on "the mainland". The four frequencies at each "end" of the two band...
by Deep Thought
Mon Apr 30, 2018 9:17 pm
Forum: FM Radio
Topic: DB exciter dip switch configuration
Replies: 7
Views: 234

Re: DB exciter dip switch configuration

This is for a different model but I would imagine they use the same frequency synthesizer for most if not all of these. If your switch bank looks like this it should work.
by Deep Thought
Sat Apr 28, 2018 12:09 pm
Forum: AM Radio
Topic: GatesAir suspends AM TX sales (Radio World)
Replies: 33
Views: 1083

Re: water/vapor cooling

RGORJANCE wrote:
Sat Apr 28, 2018 6:20 am
They sold reasonably well in the international market, but pretty much bombed in the US.
I seem to recall they used vapor phase cooling in their UHF transmitters back in the 1970s.
by Deep Thought
Fri Apr 27, 2018 7:47 am
Forum: TV Engineering
Topic: Silent spot
Replies: 13
Views: 535

Re: Silent spot

Glad I"m in Radio....... Though I suppose if a client wanted to buy 30-60 seconds of silence, we'd probably sell it to them..... I have a client who bought 60 minutes of "silence" in the middle of the night on a distant high-power co-channel station so we could take some field measurements at night...
by Deep Thought
Wed Apr 25, 2018 9:45 am
Forum: Ask the Engineers
Topic: Realistic Service Manual Request
Replies: 7
Views: 152

Re: Realistic Service Manual Request

I tried both (31-1965 is the SKU).
by Deep Thought
Wed Apr 25, 2018 8:52 am
Forum: Ask the Engineers
Topic: Realistic Service Manual Request
Replies: 7
Views: 152

Re: Realistic Service Manual Request

One of the things I really miss about the "old" Radio Shack was their "faxback" service for things like this, as well as the local repair depot which was about 10 miles from my office. You could get pretty much any documentation you needed for anything they sold just for the asking. I didn't have an...
by Deep Thought
Mon Apr 23, 2018 12:15 am
Forum: Everything else
Topic: A bit of AM History
Replies: 4
Views: 230

Re: A bit of AM History

Heh...the paint on those things would allow you to clean off the markers without even leaving a shadow.
by Deep Thought
Mon Apr 23, 2018 12:12 am
Forum: Internet Streaming
Topic: Getting Through Windows Firewall
Replies: 8
Views: 332

Re: Getting Through Windows Firewall

All of the Comcast equipment I've seen is easily set up for NAT by the user. What is the issue with this one?
by Deep Thought
Mon Apr 09, 2018 7:00 pm
Forum: FM Radio
Topic: Omnia FM HOT OS
Replies: 8
Views: 340

Re: Omnia FM HOT OS

All the Telos kids are in Las Vegas at the NAB show right now so don't expect a quick reply.
by Deep Thought
Sat Mar 31, 2018 1:38 pm
Forum: Everything else
Topic: PPM Encoding
Replies: 4
Views: 145

Re: PPM Encoding

If they don't buy the book they won't be in the publicly-released numbers. If you didn't buy the book (or get an illicit full copy of it from someone) then you won't see them either since the full survey results are only released to subscribers. If you are looking at a full report then they would be...