Search found 522 matches

by Kelly
Tue Aug 27, 2019 6:36 am
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 495

Re: FM Antenna Tuning

My guess is that filter is a notch, probably to reduce or eliminate an intermod product from being created in your amplifier from another local station 'turning-around'. If there is no data plate on the filter indicating the notch frequency, ERI probably has a record of it being sold to your station...
by Kelly
Thu Aug 22, 2019 9:14 am
Forum: FM Radio
Topic: HARRIS Z-16HD SINGLE PHASE
Replies: 3
Views: 381

Re: HARRIS Z-16HD SINGLE PHASE

I think you're saying that the power supplies aren't supplying enough current? How is your exciter output and IPA drive? Are the voltages on the IPA's all where they should be? The reason for asking, is the amount of current being drawn from the power supply depends on whether all the devices downst...
by Kelly
Fri Aug 09, 2019 9:46 am
Forum: Digital Television
Topic: ATSC 3.0
Replies: 5
Views: 512

Re: ATSC 3.0

Thanks for the clarification Doug. Yeah, I knew that and didn't do a good job of typing it. One channel to keep going with what you have, and the ATSC 3.0 modulated version. Still brings up the same dilemma; of all the markets, how many have the option of a second-dedicated ATSC 3.0 channel? Anymore...
by Kelly
Thu Aug 08, 2019 1:17 pm
Forum: Digital Television
Topic: ATSC 3.0
Replies: 5
Views: 512

ATSC 3.0

Haven't had to deal with this yet, but have tried to follow along in the trades. I'm a little concerned, or better yet, confused with the future roadmap for ATSC 3.0: 1. You need two whole channels to properly transmit ATSC 3.0. Especially in larger markets and especially now with the repack, like h...
by Kelly
Thu Aug 08, 2019 10:10 am
Forum: FM Radio
Topic: National EAS Test
Replies: 16
Views: 532

Re: National EAS Test

Yeah, bucket brigades don't work too well if even one of the buckets is full of crap.
by Kelly
Thu Aug 08, 2019 7:27 am
Forum: FM Radio
Topic: National EAS Test
Replies: 16
Views: 532

Re: National EAS Test

I was driving home from North Carolina when the test rollled. Was listening to SiriusXM at the time and noticed the tones and EOM were fine, but the message audio was pretty distorted. It was intelligible I suppose, but I'm used to picking audio out of white noise, so someone who was paying less att...
by Kelly
Fri Aug 02, 2019 6:48 pm
Forum: FM Radio
Topic: Omni FM with Parasitics?
Replies: 8
Views: 317

Re: Omni FM with Parasitics?

My money is on that's a bullet hole. Generally lightning doesn't blow a single hole in copper tubing.
by Kelly
Wed Jun 26, 2019 5:54 am
Forum: AM Radio
Topic: Harris DX-50 raise and lower problem
Replies: 4
Views: 330

Re: Harris DX-50 raise and lower problem

You may want to try carefully pushing the ribbon cables on the rear of the front panel circuit board. Over time, those cables are prone to become intermittent as the teeth that bite into each individual conductor back out.
by Kelly
Sat Mar 16, 2019 5:29 pm
Forum: FM Radio
Topic: BE FM20A/B IPA Issue
Replies: 2
Views: 425

Re: BE FM20A/B IPA Issue

If it's never been done, I'd plan on replacing the big round filter caps in each of the IPA's. Those things when they go way out of value, will make the IPA's go into mute mode intermittently.
by Kelly
Mon Feb 04, 2019 1:20 pm
Forum: FM Radio
Topic: HT-10 APC issues
Replies: 12
Views: 769

Re: HT-10 APC issues

There are so many variables. Synchronous and Asynchronous AM noise are different but similar animals. If the APC is running the screen too low or high from where the tuning is resonant, that could cause increased Asynchronous AM noise. As jthorusen mentioned; if the APC is off and the transmitter tu...
by Kelly
Mon Feb 04, 2019 1:10 pm
Forum: TV Engineering
Topic: 4K/60Hz HDMI DA that works?
Replies: 5
Views: 393

Re: 4K/60Hz HDMI DA that works?

I echo what Jeff mentioned. That, and unless you're running cables that support HDMI 2.0, 50 feet may be pushing the length. Most HDMI DA's don't do any level boost, so if your input cable to the DA is causing any attenuation, that level is passed along on the output spigots. My bet is you'll probab...
by Kelly
Fri Feb 01, 2019 11:47 am
Forum: FM Radio
Topic: HT-10 APC issues
Replies: 12
Views: 769

Re: HT-10 APC issues

It's been a while, but I recall those Harris THE-1 exciters were plagued with microphonic tendencies from blower motor vibration. Besides being a pretty crappy exciter, they should at least be mounted apart from the transmitter.
by Kelly
Tue Jan 08, 2019 1:06 pm
Forum: FM Radio
Topic: BE FM-5BS PROBLEM
Replies: 5
Views: 462

Re: BE FM-5BS PROBLEM

Many moons ago I had something similar happen to a BE tube rig. After a lot of tracing, I discovered one of the bypass caps in one of the wires connecting between the controller and some solid state relays had shorted. The caps were soldered on a PC backplane board mounted in the aluminum shielding ...
by Kelly
Fri Dec 14, 2018 12:57 pm
Forum: Broadcast Engineering News
Topic: Tiger Mountain (WA) master antenna catches on fire
Replies: 21
Views: 1817

Re: Tiger Mountain (WA) master antenna catches on fire

This was a dual feed antenna, a top and bottom section so there would have to been two VSWR detectors for each transmission line going up the tower to the antenna. Another question is why was there no pressure monitor on each transmission line along with a run monitor on the pressurization system. ...