Search found 588 matches

by TPT
Tue Apr 25, 2017 1:18 pm
Forum: FM Radio
Topic: Vertical or Circular polarization FM Broadcast
Replies: 7
Views: 82

Re: Vertical or Circular polarization FM Broadcast

20 meter tower (65 feet) plus an extra 5 feet to play with: 70 feet of 1/2 foam coax (Andrew LDF-4 used to calculate) efficiency 90%. SWR single bay CP antenna, gain .441. TPO needed: 258 watts. Nautel VS300, type accepted for LPFM service, 330 watts maximum power. Can be configured with built in Or...
by TPT
Tue Apr 25, 2017 6:39 am
Forum: FM Radio
Topic: New Sound Board
Replies: 5
Views: 103

Re: New Sound Board

I have installed 8 channel R-55E consoles at a number of stations. A high school 900 watt FM; a community college LPFM, and a 9000 watt college non-com. I have one in my production studio at one station. Cost is around $4,800 depending on modules chosen. The board comes with a 4 channel mike preamp,...
by TPT
Tue Apr 25, 2017 6:25 am
Forum: FM Radio
Topic: Vertical or Circular polarization FM Broadcast
Replies: 7
Views: 82

Re: Vertical or Circular polarization FM Broadcast

Unless you are streaming, you have next to no home listening. Go ask your friends what kind of table radio they use. So your audience is the car radio audience. Look at what passes for antennas on most cars. My company van--a 2005 Ford Econoline--has a vertical whip antenna. But my business partner'...
by TPT
Sat Apr 22, 2017 6:25 am
Forum: FCC Discussion
Topic: More TV mergers coming soon.
Replies: 3
Views: 104

Re: More TV mergers coming soon.

Radio controls their means of distribution. Hop in your car and turn the radio on... TV is increasingly dependent on other carriers--cable and satellite. I haven't watched OTA TV for years..increasingly my prime-time TV watching includes programs straight from network servers via a download channel ...
by TPT
Fri Apr 21, 2017 3:10 pm
Forum: Ask the Engineers
Topic: Offical AMC 8 Transition Thread (was Sat. AMC-8)
Replies: 79
Views: 3634

Re: Offical AMC 8 Transition Thread (was Sat. AMC-8)

We bought one (used) like that to receive our state network on Galaxy at 99 degrees. Took the dish apart, assembled it on the new post aimed in the right direction, got "Derf" from the two way shop with his spectrum analyzer, & set it up. When we re-assembled the dish we left that actuator arm off. ...
by TPT
Wed Apr 19, 2017 4:05 pm
Forum: Radio Automation Systems
Topic: Looking for MusicGen installer
Replies: 1
Views: 66

Re: Looking for MusicGen installer

We use Natural Music which is a buy-out. Also in use at a college station and a high school station we help out. Like any such program, the real work is in deciding on categories, installing the database, and setting up a clock. Once this is done, the actual log generation is fairly simple, and data...
by TPT
Fri Apr 14, 2017 5:40 am
Forum: Broadcast Engineering News
Topic: FCC announces incentive auction results (Repack!)
Replies: 2
Views: 133

Re: FCC announces incentive auction results (Repack!)

What happens to the low power TV's? Two in my market--ch. 22 and 47.
by TPT
Wed Apr 12, 2017 7:49 am
Forum: FM Radio
Topic: RBDS Phase
Replies: 4
Views: 183

Re: RBDS Phase

Or an external pilot sample, such as are available from many modern processors. We feed our little Pira RDS geni from that sample off an Omnia One. Then there are the Nautel transmitters, with an internal RDS generator--referenced to the internal stereo generator, I presume. On our NV10lt and VS2.5,...
by TPT
Tue Apr 11, 2017 1:13 pm
Forum: FM Radio
Topic: RBDS Phase
Replies: 4
Views: 183

Re: RBDS Phase

Never saw anywhere where this was supposed to be a problem. Some RDS geni's generate their own sub-carrier, without reference to the pilot.
by TPT
Wed Apr 05, 2017 2:07 pm
Forum: FM Radio
Topic: SWR/Return loss question???
Replies: 7
Views: 304

Re: SWR/Return loss question???

What happens if you terminate the unused port to the combiner?
by TPT
Tue Apr 04, 2017 2:26 pm
Forum: FM Radio
Topic: ERI .78 spacing
Replies: 9
Views: 321

Re: ERI .78 spacing

May be a useful exercise to first run the numbers comparing TPO vs. antenna gain to get your ERP. Let's assume you have a 300' run of 1 5/8th air to the antenna now--6 kw ERP on the Shively takes about 3300 watts TPO If you went with an off-the-shelf 1/2 wave spaced 4 bay ERI, you would need about 5...
by TPT
Tue Apr 04, 2017 7:34 am
Forum: FM Radio
Topic: ERI .78 spacing
Replies: 9
Views: 321

Re: ERI .78 spacing

Have two stations in our area with 1/2 wave spaced antennas--two class A's mounted below the antenna for a Class B. Space considerations on the relatively short tower & RF levels at ground level were the main considerations in using the half wave spaced antennas. Not particularly impressed by the re...
by TPT
Fri Mar 31, 2017 2:47 pm
Forum: FM Radio
Topic: SWR/Return loss question???
Replies: 7
Views: 304

Re: SWR/Return loss question???

Sometimes a short jumper like you described may actually be the cause of the reflected power. Changing the length--e.g., changing the wavelength of that short piece of transmission line may improve the overall match of the system.
by TPT
Thu Mar 16, 2017 9:45 am
Forum: Ask the Engineers
Topic: Offical AMC 8 Transition Thread (was Sat. AMC-8)
Replies: 79
Views: 3634

Re: Offical AMC 8 Transition Thread (was Sat. AMC-8)

If you have a receiver that is not currently in use (e.g., for baseball coverage) you may want to carefully check it out before you need it. Even if you've already made the switch & the receiver looks happy. Our new dish is still sitting in the garage, but a couple of weeks ago we noticed that the b...
by TPT
Tue Mar 14, 2017 3:40 pm
Forum: Ask the Engineers
Topic: EAS over Barix
Replies: 8
Views: 239

Re: EAS over Barix

I have NWS stations I monitor that are in the noise some times...yet the header tones decode just fine. Would not be an issue I would worry about.