Search found 173 matches

by davek
Thu Mar 02, 2017 3:38 pm
Forum: FM Radio
Topic: High Pitched Tone in FM Audio?
Replies: 23
Views: 2649

Re: High Pitched Tone in FM Audio?

Here you go :)
FM-535-WCF.pdf
(197.37 KiB) Downloaded 92 times
FM-580-WCF.pdf
(56.35 KiB) Downloaded 80 times
by davek
Wed Feb 22, 2017 3:45 am
Forum: FM Radio
Topic: Z 10 rigs
Replies: 4
Views: 750

Re: Z 10 rigs

I have also successfully repaired Z PA modules .. transistors were purchased from DigiKey.

Also, having since totally re-built the rectifier modules using different fuses, I have not had a single PSU TAP fault in the 18 months since installing them. :D
by davek
Wed Feb 08, 2017 3:11 am
Forum: TV Engineering
Topic: 8 vsb test gear
Replies: 5
Views: 861

Re: 8 vsb test gear

by davek
Mon Feb 06, 2017 3:15 pm
Forum: TV Studio Engineering
Topic: 5.1 to 2.0 downmix card?
Replies: 2
Views: 1341

Re: 5.1 to 2.0 downmix card?

Ward Beck make a OpenGear card which might work for you .. model number is M6205A-3G
by davek
Mon Jan 23, 2017 11:13 pm
Forum: FM Radio
Topic: FM Composite isolation
Replies: 12
Views: 1500

Re: FM Composite isolation

Well curiosity got the better of me. I made a test measurement of stereo cross-talk using a 3FT length of Belden 1694A between stereo generator and exciter. Then repeated the test with an additional 100FT of Belden 1694A. I was quite surprised actually how little difference the extra long piece of c...
by davek
Sat Jan 21, 2017 12:09 am
Forum: FM Radio
Topic: FM Composite isolation
Replies: 12
Views: 1500

Re: FM Composite isolation

Thanks for your thoughts. Chuck: The composite source is a STL receiver. Cable length is about 50 feet (which is not ideal) but this will be a temporary situation while the main transmitter is worked on. DT: Good to know the video transformer stands a chance of breaking the ground loop. I'll take so...
by davek
Fri Jan 20, 2017 9:39 pm
Forum: FM Radio
Topic: FM Composite isolation
Replies: 12
Views: 1500

FM Composite isolation

I have a question for the brains trust: I may be facing a situation where composite program needs to be fed into a FM exciter. However the input equipment and transmitter are on separate floors, and are on separate power feeds. I don't have a lot of control over how this situation came to be, but I ...
by davek
Fri Jan 20, 2017 6:06 pm
Forum: TV Studio Engineering
Topic: Sony RCP-750 CCU preview question.
Replies: 4
Views: 811

Re: Sony RCP-750 CCU preview question.

It doesn't latch.

You have to program your router panel to do the latching for you.
by davek
Sun Jan 08, 2017 5:31 pm
Forum: TV Studio Engineering
Topic: Sony RCP-750 CCU preview question.
Replies: 4
Views: 811

Re: Sony RCP-750 CCU preview question.

I thought the RCP just outputs a contact closure when the iris control is pressed.
Normally it's connected to a GPIO contact on a router panel, and the programming of the panel determines if the switching is momentary or latching.
by davek
Wed Nov 09, 2016 12:18 am
Forum: TV Engineering
Topic: TT1260 MIB file
Replies: 2
Views: 903

Re: TT1260 MIB file

http://www.google.com/search?q=MIB+file

in a nutshell, a MIB file (Management Information Base) describes available OIDs (Object Identifiers) for SNMP for a given device. In this case, a TT1260
by davek
Wed Nov 09, 2016 12:12 am
Forum: Digital Television
Topic: Portable video analyzer
Replies: 2
Views: 644

Re: Portable video analyzer

I've used this in the field (on sports remotes) and it works great. Generates SDI too..

http://www.murraypro.com/testchest.htm
by davek
Wed Sep 28, 2016 4:12 am
Forum: FM Radio
Topic: Gates Air Flex20 vs. Nautel NV20lt
Replies: 16
Views: 2117

Re: Gates Air Flex20 vs. Nautel NV20lt

May I add a third suggestion, apart from Gates and Nautel? Have a look at the Rohde & Schwarz THR9 Liquid Cooled series of FM transmitter. https://www.rohde-schwarz.com/us/product/thr9-productstartpage_63493-45698.html It's efficiency is comparable to the Harris/Nautel product. Depending on how your...
by davek
Wed Aug 17, 2016 3:39 pm
Forum: FM Radio
Topic: Worst FM Transmitter
Replies: 98
Views: 16978

Re: Worst FM Transmitter

We kept a Channel 6 dual cabinet NEC TV transmitter on the air from 1986 to the day they made the flash cut to digital (Harris Sigma). The NEC was a great box. The audio amp transistors were impossible to get in the later years, the thing was down to 2 or 3 audio amps working towards the end. Yes, ...
by davek
Wed Aug 17, 2016 3:34 pm
Forum: FM Radio
Topic: Whistling Birdie in FM signal
Replies: 29
Views: 2903

Re: Whistling Birdie in FM signal

The Harris Digit exciter was notorious for generating a whine when the capacitors on the A4 module dried out. There was a service bulletin which recommended replacing the caps and adding ventilation holes to the module cover. I wonder if the same applies to the THE-1?
by davek
Sat Aug 06, 2016 5:15 pm
Forum: Production Studios
Topic: APTx to .wav conversion
Replies: 8
Views: 1062

Re: APTx to .wav conversion

I found the utility program, but not sure if it will work for you.
Is there a way you can send me a short audio file and I can test it first?