Search found 75 matches

by Ray
Wed Jul 01, 2020 2:32 pm
Forum: FCC Discussion
Topic: AM primary station to Translator separation
Replies: 2
Views: 166

AM primary station to Translator separation

Does part 74.1201 (g) apply for a AM (class B) primary station to lease a FM translator that is well beyond the primary station's 1mV/meter coverage area? The translator location is actually close to the 0.1 mV/meter primary contour. (g) Translator coverage contour. For a fill-in FM translator rebro...
by Ray
Sun Jun 21, 2020 6:30 am
Forum: STL Engineering
Topic: Marti SRPT-30 frequency change
Replies: 4
Views: 284

Marti SRPT-30 frequency change

How easy are minor frequency changes for the newer synthesized Marti RFUs (analog)? It looks like you have to program the frequency via a RS232. Is special software required or is it just a RS232 command? Can't seem to find any documentation that talks about this other than "send it to the factory"....
by Ray
Mon May 11, 2020 6:25 am
Forum: FCC Discussion
Topic: EAS Monitoring Requirements
Replies: 9
Views: 804

Re: EAS Monitoring Requirements

Digital Alert Systems (formerly Monroe) is now offering a "special" price for a EAS firmware catchup to the current version 4 for $390 until June. This will take you from whatever version you are now using to the current version. I don't know if June means until June 1 or the end of June Not cheap b...
by Ray
Sat Jan 04, 2020 7:32 am
Forum: FM Radio
Topic: Smart AC Power Circuit Breaker with Web Control?
Replies: 18
Views: 784

Smart AC Power Circuit Breaker with Web Control?

We had a car that ran into a utility pole late yesterday and took out the AC power. This has happened several times before and is can be handled remotely with the station controller. This time however, the surge tripped a 115 VAC circuit breaker in the control room that powers the computer UPSs. It ...
by Ray
Sat Jan 04, 2020 7:19 am
Forum: FM Radio
Topic: How to feed mono only audio into base band input on tx?
Replies: 14
Views: 556

Re: How to feed mono only audio into base band input on tx?

I've thought of buying the StereoTool Software www.stereotool.com for a backup Tx for about $150 and installing on a dedicated rack mounted PC. Not sure of the reliability, but it might be OK for a backup. I'd be interested to find out how the new car radios have the same range with mono or stereo. ...
by Ray
Tue Dec 31, 2019 1:44 pm
Forum: FM Radio
Topic: Nicom BKG77 Issue I think
Replies: 11
Views: 715

Re: Nicom BKG77 Issue I think

I used Coax Seal (connector putty) several years ago. Andrew also sold their own version. It is OK until you try to remove it and then it leaves remnants on the connector threads that are hard to remove. Mineral Spirits is about the only way to remove it. The idea is that any left over residual can ...
by Ray
Tue Dec 31, 2019 7:33 am
Forum: FM Radio
Topic: Nicom BKG77 Issue I think
Replies: 11
Views: 715

Re: Nicom BKG77 Issue I think

I had a similar problem a couple of years ago. It just about drove me crazy. There was a random VSWR spike every few weeks that would sometimes fault the transmitter. I even logged the forward and reflected power with a A/D converter for about a month. I think the root cause was remnants of RF conne...
by Ray
Fri Jul 26, 2019 12:02 pm
Forum: FM Radio
Topic: Stop Buzzer?
Replies: 5
Views: 328

Stop Buzzer?

I had a frequency search service ask me for our "stop buzzer" this morning. I found out they were asking for the FCC Point of Contact for shutdown. I've never heard this term used before.
by Ray
Fri Jul 19, 2019 6:03 am
Forum: Ask the Engineers
Topic: Cutting Hard Line
Replies: 12
Views: 540

Re: Cutting Hard Line

I also use a hacksaw, but I put the Heliax in a mitre box when I cut so that I can get a square cut. This works up to 1 5/8 diam.
by Ray
Mon Mar 04, 2019 5:52 pm
Forum: FM Radio
Topic: Very low power recommendation
Replies: 22
Views: 1660

Re: Very low power recommendation

There was a BW TX-5 V2 5 watt transmitter on ebay last week. I've used a BW TX-50 as a standby. It has a simple 4 band processor included,
The only problem is the display seems to go bad with time. Has a good remote interface.
by Ray
Tue Jan 01, 2019 7:34 am
Forum: Ask the Engineers
Topic: Timed Capture of Measurement on Anritsu MS2721A/B
Replies: 7
Views: 499

Re: Timed Capture of Measurement on Anritsu MS2721A/B

I hope everyone is having a great New Years, I've had good luck using a DATAQ DI-1120 external 14 bit A/D converter (<$200) to capture long-term data from some older SAs. If the SA has an external X and Y axis output ports, you can just record the data on a couple of the available four channels. The...
by Ray
Thu Dec 20, 2018 7:56 am
Forum: FM Radio
Topic: PC Software for Audio Processor for FM translator ?
Replies: 10
Views: 665

Re: PC Software for Audio Processor for FM translator ?

I have had very good luck with HP Z400 workstations used for both on-air and production. You can get them with loaded with Windows 7 and >8 GB RAM often for <$200. I probably have about eight of them now. They are very well made (much better than consumer grade) and very stable. Corporations used th...
by Ray
Tue Dec 18, 2018 3:11 pm
Forum: FM Radio
Topic: PC Software for Audio Processor for FM translator ?
Replies: 10
Views: 665

Re: PC Software for Audio Processor for FM translator ?

Several folks really like Stereo Tool. The author has had displays at NAB a few times. Cost is very reasonable.
I think Orban and Telos also have software versions

https://www.stereotool.com/

Ray
by Ray
Mon Dec 17, 2018 7:30 am
Forum: FM Radio
Topic: High Reflected Power Puzzle
Replies: 33
Views: 2016

Re: High Reflected Power Puzzle

I've found the customer service at Broadcast Concepts to be first class. I was also thinking of making a second backup amplifier (emergency use only) using one of their Pallet Amplifier since I have everything else I need (PS, LPF, enclosure etc).. I'm worried about possible FCC inspection if I was ...
by Ray
Fri Dec 14, 2018 7:48 am
Forum: FM Radio
Topic: High Reflected Power Puzzle
Replies: 33
Views: 2016

Re: High Reflected Power Puzzle

If the PA is oscillating at 90 MHz with a high output, I would take the transmitter out of service immediately. If any other spurs are present (especially in the aviation band), this could really turn into a problem with the FCC. I remember (don't have the regs with me now) the required FCC harmonic...