Search found 346 matches

by grich
Thu Apr 19, 2018 4:27 pm
Forum: Master Control
Topic: X-Y protocol??
Replies: 20
Views: 262

Re: X-Y protocol??

The FS2 will frame-rate convert, although there may be limits...I haven't looked. We have one converting two devices (an Apple TV box and a grid cam) from 1080i60 to 1080i59.94. The FS1 certainly can't do that. We had a smattering of X-Y protocol devices over the years, and some third-party computer...
by grich
Thu Apr 19, 2018 11:14 am
Forum: TV Engineering
Topic: TV tower collapse near Springfield MO
Replies: 1
Views: 109

TV tower collapse near Springfield MO

http://www.ky3.com/content/news/TV-towe ... 61283.html

Sad. The fact that only one of the six crew members on the tower was killed is amazing.

This will place even more pressure on an already tight pool of tall-tower crews with the TV repack underway.
by grich
Wed Apr 11, 2018 10:33 am
Forum: FM Radio
Topic: FM3.5 odd problem
Replies: 9
Views: 313

Re: FM3.5 odd problem

The FM3.5 uses a solid state relay in the primary of the plate xfmr. Nice work finding that. Would never have guessed to look there. Harris had a field upgrade for that, adding a magnetic contactor. The contactor went in the plate primary circuit,the SSR then got rewired to operate just the contact...
by grich
Mon Mar 26, 2018 10:58 pm
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

I know my previous post was 100% ignored on this topic , but hopefully you'll pay attention to this one. OSHA requires those tanks be secured to the wall or structure. If the Tank is not secured to the wall, it MUST have the safety cap on and tight on top. If you tip a tank over, and the valve pops...
by grich
Mon Mar 26, 2018 1:11 pm
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

That tank needs to be chained or strapped tight to a wall, bollard, or other structure so it can't fall over. If it falls over and the valve gets knocked off, BAD things will happen. Plenty of online videos, and even a Mythbusters segment on what happens.
by grich
Mon Mar 26, 2018 1:08 pm
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 27
Views: 445

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

If you're a phone geek, this link will be a colossal time-suck. :D Isn't that the truth. I spend a couple of hours digging thru the site and learned the name of several local sites that I have seen all my life and a few whereI have worked on 2-way and FM equipment. But never found a single mention ...
by grich
Mon Mar 26, 2018 12:51 pm
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

jbarth200 wrote:
Mon Mar 26, 2018 12:28 pm
...I'm thinking of coming out one night and turning my RF off and taking a look to see if any pressure windows are gone on the waveguide on the ground...
I'd do a bubble test first before going through all that trouble.

Also, is that tank chained to the wall?
by grich
Sat Mar 24, 2018 9:53 pm
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 27
Views: 445

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. And a TV network or two. http://long-lines.net/ If you're a phone geek, this link will be a colossal time-suck. :D
by grich
Fri Mar 23, 2018 10:34 am
Forum: TV Engineering
Topic: Replacement for HD-Star
Replies: 6
Views: 150

Re: Replacement for HD-Star

They let me have ours back:) From the Main Menu; - Sig Info - ANC Status Any ancillary signal that's present shows up in white. (it's grayed out if it's not present) It'll also show red if the packet is present but has errors. The Setup button lets you define the three User-n options at the bottom ...
by grich
Thu Mar 22, 2018 1:47 pm
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

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, ...
by grich
Thu Mar 22, 2018 11:41 am
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

Depends on the leak location. If the leak is where the nitrogen bottle connects to the regulator, the line MIGHT still hold some pressure.
by grich
Thu Mar 22, 2018 10:37 am
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

Get some leak detector fluid or soapy water. Spray the fittings on the waveguide, manifold and N tank. Look for bubbles.

If you can't find a leak on the ground, you'll have to have a tower crew check the line.
by grich
Thu Mar 22, 2018 9:47 am
Forum: TV Engineering
Topic: Replacement for HD-Star
Replies: 6
Views: 150

Re: Replacement for HD-Star

w9wi wrote:
Thu Mar 22, 2018 5:42 am
...it will check for specific DID/SDID combinations in the ancillary data. Like NBC Namedropper cues...
Wow...I'll have to read up on that function, although we rarely have Namedropper trigger issues. I think. :D
by grich
Thu Mar 22, 2018 9:42 am
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 458

Re: Transmitter Nitrogen Issue

What pressure is your regulator set to?

Have you tested for leaks at the tank?
by grich
Wed Mar 21, 2018 8:25 pm
Forum: TV Engineering
Topic: Replacement for HD-Star
Replies: 6
Views: 150

Re: Replacement for HD-Star

We've been using a Phabrix unit since we went HD. Test signals, embedded or AES audio, waveform/vector, eye/jitter.

Except for the battery petering out, it's been trouble-free.