Search found 737 matches

by TPT
Fri Jun 22, 2018 6:24 am
Forum: Ask the Engineers
Topic: RF Triangulation - number of devices
Replies: 5
Views: 72

Re: RF Triangulation - number of devices

Ah, you must have just thrown $$$ out the window registering your sat dish. Getting ready for when the Commission authorizes mobile devices in C-band?

Don't know how else you could track down interference from "mobile" devices not licensed to a particular location.
by TPT
Wed Jun 13, 2018 6:39 am
Forum: FM Radio
Topic: FM and windmills
Replies: 6
Views: 215

Re: FM and windmills

WWPN, Westernport, Maryland had to move their studio site when a line of windmills was built on the path between studio and transmitter site.

Those whirling blades didn't help 950 reception.
by TPT
Tue Jun 12, 2018 4:50 pm
Forum: From the Trenches
Topic: Strange skills learned
Replies: 10
Views: 236

Re: Strange skills learned

Remember the V-series Nautel FM transmitters? Had a 2.5 made up of two V-1's and a combiner. The combiner had a hole cut in the back for an RJ-45--but no connector. One of the many times the system went down had a combiner problem--mouse got in through that small hole and set up his apartment inside...
by TPT
Tue Jun 12, 2018 1:17 pm
Forum: AM Radio
Topic: BE AM 1A Power meter not working in FWD
Replies: 11
Views: 335

Re: BE AM 1A Power meter not working in FWD

Check to see what drives the meter. Not uncommon to find an op amp used as a meter driver--this may be what failed.
by TPT
Sat Jun 02, 2018 6:28 pm
Forum: Everything else
Topic: Name that mic
Replies: 2
Views: 115

Re: Name that mic

EV 635. Easy question.

Got something harder?
by TPT
Tue May 29, 2018 5:48 am
Forum: AM Radio
Topic: Transmitter plant ambient temps?
Replies: 9
Views: 478

Re: Transmitter plant ambient temps?

One of the problems with solid state transmitters is air flow. I have a pair of Nautel V1's that--when they worked--had constant problems with heat because of inadequate ventilation. The last working one had to be run with the covers off (usually on the floor--it was relegated to back-up use on loan...
by TPT
Thu May 24, 2018 6:54 am
Forum: FM Radio
Topic: Compression Question
Replies: 9
Views: 325

Re: Compression Question

Also.... Watch overall levels when recording. My rule of thumb is to keep voice peaks about 12 db below maximum. You can then do some normalization after the show is done. However, the waveform should not look like a solid black bar when you get done with the program--like you see if you rip some of...
by TPT
Wed May 23, 2018 5:13 pm
Forum: Everything else
Topic: Tomato Soup Incident
Replies: 22
Views: 489

Re: Tomato Soup Incident

1. Buy a new Bluetooth

2. Next time carry your soup cup on a plate.
by TPT
Sat May 12, 2018 6:02 pm
Forum: Everything else
Topic: Am I a possible engineer candidate?
Replies: 7
Views: 262

Re: Am I a possible engineer candidate?

Keep the state job--do some contract work for small stations. State pension & insurance something you probably can't replace going private sector. No problem with your qualifications--just the career opportunities available in a declining industry. If you would still like to get some experience on t...
by TPT
Thu May 10, 2018 5:33 am
Forum: Ask the Engineers
Topic: C-band TI
Replies: 21
Views: 472

Re: C-band TI

Microwave filter makes a good AWACS filter. We've used hard ware cloth (looks like heavy window screen, made of metal) as shielding --but that was to protect against back scatter from a nearby MCI tower behind our dish. Hardware cloth is often used around gardens to keep rabbits out. As I recall, th...
by TPT
Wed May 09, 2018 7:14 am
Forum: Ask the Engineers
Topic: STL Frequencies
Replies: 12
Views: 285

Re: STL Frequencies

We have a pair of Bric Links with the switchboard software. Don't need static IP addresses--if connection gets broken they reconnect through the switchboard server. The cost of the Bric Links is about the same as the cost of a refurbished STL-10. Used them on a weekly scoreboard show during football...
by TPT
Tue May 08, 2018 6:29 pm
Forum: Ask the Engineers
Topic: STL Frequencies
Replies: 12
Views: 285

Re: STL Frequencies

Translator on one of my towers is fed by a Ubiquiti unit on 5 ghz high band. The transmit is at 800 feet AMSL on their STL tower, the receive is about 100 ft (or 1100 ft. AMSL) on my tower--short path, about 4 miles. They use Barix exstreamers on both ends.
by TPT
Mon May 07, 2018 7:19 am
Forum: Ask the Engineers
Topic: STL Frequencies
Replies: 12
Views: 285

Re: STL Frequencies

Section 74.431 (H) allows temporary use for a program link in an equipment failure or other emergency that disrupts the usual STL. As noted, 74.432 provides further exceptions for Alaska, Hawaii and Puerto Rico.
by TPT
Sat May 05, 2018 1:17 pm
Forum: TV Engineering
Topic: Silent spot
Replies: 13
Views: 569

Re: Silent spot

Years ago local daytime AM sold sign-off to a funeral home:

"The following hours of silence brought to you by Leavitt's Funeral Home"

Click

Hisssssssssssssssssss
by TPT
Wed May 02, 2018 2:36 pm
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 41
Views: 978

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

Look at the Monday daily digest--has notice regarding this matter. Comments due May 31. Here's what my state association got from the NAB on this issue: We completely understand the frustration and the importance of the C-band for content distribution. The unfortunate reality is that some amount of ...