Search found 112 matches

by Slab Bulkhead
Mon Sep 26, 2016 1:28 pm
Forum: AM Radio
Topic: Setting ideas for an Optimod 9100a
Replies: 24
Views: 2623

Re: STL options

Fixing to add a translator feed over the same circuit but using Tieline Bridge-its, another pair of which we are currently using to feed another translator (no hot backup). I don't like them all that much but most of the time they're ok. Also have Cox on both ends for this other connection. The Bri...
by Slab Bulkhead
Thu Sep 15, 2016 6:58 am
Forum: FCC Discussion
Topic: Any word on the length of the pending NPT?
Replies: 25
Views: 2179

Re: Any word on the length of the pending NPT?

So, it will then be cut off at 2:00 minutes by all those decoders that haven't been recently decoded. Or perhaps even by those decoders that have been upgraded--if they left the 2 minute limit in place for the NPT. Three minutes to control the audio of all radio, TV and cable outlets in the country...
by Slab Bulkhead
Tue Sep 13, 2016 12:48 pm
Forum: On-Air Studios
Topic: Remoting sat receivers off site
Replies: 7
Views: 869

Re: Remoting sat receivers off site

Some of the Comrex units have up to four closures...Met. Opera uses this system for stations that can't use the NPR satellite. More closures? A problem. In theory should work--touch tone encode/decode devices. Worked well for me when I had to lash up 8 contact closures for a satellite program betwe...
by Slab Bulkhead
Tue Sep 13, 2016 12:44 pm
Forum: STL Engineering
Topic: Good ole analog
Replies: 22
Views: 2586

Re: Good ole analog

W2XJ wrote:Be careful. Your license is only valid for one form of emission unless you have two separate frequencies licensed.
Both systems have licenses on the books.
by Slab Bulkhead
Tue Sep 13, 2016 12:37 pm
Forum: AM Radio
Topic: Setting ideas for an Optimod 9100a
Replies: 24
Views: 2623

Re: Setting ideas for an Optimod 9100a

Microwave is not an option when one fails to deal with line of sight issues. Thought actually expressed by a corporate engineer: "(not an exact quote) go find those trees impinging on the Fresnel zone and have them cut down!" This same individual would probably recommend bringing in a wrecking ball...
by Slab Bulkhead
Mon Sep 12, 2016 1:33 pm
Forum: AM Radio
Topic: Setting ideas for an Optimod 9100a
Replies: 24
Views: 2623

Re: Setting ideas for an Optimod 9100a

I help take care of an outfit that has an 8k analog circuit feeding an AM and a 15k digital (nailed up ISDN) feeding the FM translator. Since the telco charges on distance, and the sites are just 2-3 miles from the station, it was cheaper to use PTP circuits. I suppose we are screwed if they decide ...
by Slab Bulkhead
Mon Sep 12, 2016 1:26 pm
Forum: Everything else
Topic: On the venerable TRS plug.....
Replies: 6
Views: 775

Re: On the venerable TRS plug.....

if you're on Verizon it isn't active & you can't activate it This is why I don't "buy" subsidized phones. This. Never again...unlocked secondhand devices for me, please. This sounds like just another example of Apple's "too hip for the room" attitude and penchant for forcing the user to buy expensi...
by Slab Bulkhead
Mon Sep 12, 2016 1:23 pm
Forum: STL Engineering
Topic: Good ole analog
Replies: 22
Views: 2586

Re: Good ole analog

I have one of the Nicom analog units as a backup. Haven't used it for a while but it worked last time it was tried. The primary is a Starlink digital which works great since the path is short (2.5 miles). The transmitter site is in a metro area but was a black hole for internet. The only service ava...
by Slab Bulkhead
Fri Sep 02, 2016 9:33 am
Forum: Radio Studio Engineering
Topic: Off-air monitors?
Replies: 19
Views: 2824

Re: Off-air monitors?

Sure! I'll try and go from memory as I had to do a lot of fiddling with it to get it to work. Most of this involved the code to control the RadioShark which is somewhat old now and depends on old USB HID libraries that weren't available on the Raspbian package archives, so I had to hunt them up and ...
by Slab Bulkhead
Tue Aug 30, 2016 8:52 am
Forum: Radio Studio Engineering
Topic: Off-air monitors?
Replies: 19
Views: 2824

Re: Off-air monitors?

I made the mistake of getting one of those RS80 tuners for an air monitor at an LPFM station. Bad move. The reception was noisy more often than not, and I have a feeling it was either lack of sensitivity (the tower was about 2.5 miles away) and lack of adjacent channel rejection as the LP was on a 2...
by Slab Bulkhead
Fri Aug 19, 2016 7:58 am
Forum: FM Radio
Topic: Whistling Birdie in FM signal
Replies: 29
Views: 2895

Re: Whistling Birdie in FM signal

When I first got into engineering at a college radio station, we always had this problem with a birdie in the air monitor. I have to think it was the heterodyne from our dinky 8 watt ERP signal not having enough oomph to override the co-channel 50kW boomer that we were on the far fringe of.
by Slab Bulkhead
Wed Aug 17, 2016 11:24 am
Forum: Ask the Engineers
Topic: Fm translator equipment- Is there a market for it?
Replies: 8
Views: 826

Re: Fm translator equipment- Is there a market for it?

There should be a market for that stuff somewhere. I think those Nicom antennas usually go for around $700-800 new so I could see $300-500 on it in good used condition. The transmitters are too low powered for most LPFM setups unless it's a high HAAT station with a severely derated ERP (can't use an...
by Slab Bulkhead
Wed Aug 10, 2016 7:28 am
Forum: STL Engineering
Topic: Using a single Marti for l/r audio
Replies: 6
Views: 993

Re: Using a single Marti for l/r audio

That's what I would do and have done. Many folks won't notice. Those who do probably won't drop you for it, though it might get some to call who wouldn't otherwise have let you know they were there. You DO want to sum L and R, as you have done, especially if you're playing oldies or other music wit...
by Slab Bulkhead
Wed Aug 10, 2016 7:16 am
Forum: FM Radio
Topic: Omnia One
Replies: 9
Views: 1345

Re: Omnia One

I have one on the 2.7 firmware and it works with the latest Java release. I did run into an issue where I accessed it from a Linux computer that had the IcedTea plugin instead. The remote crashed and then I couldn't access any of the web pages on the unit until I went to the site and power cycled it.
by Slab Bulkhead
Thu Jul 28, 2016 2:22 pm
Forum: FM Radio
Topic: Translator or Optimod audio problem
Replies: 8
Views: 1064

Re: Translator or Optimod audio problem

I'd check your codec at the translator to see if it dropped the bit rate because of an Internet-related glitch or loss of bandwidth. I don't believe the Tieline codecs will ramp the bit rate back up once any bandwidth logjam clears. We are running a CBR mode, so I wouldn't think codec bit rate woul...