Search found 52 matches

by Ray
Wed May 16, 2018 6:50 am
Forum: Ask the Engineers
Topic: C-band TI
Replies: 21
Views: 410

Re: C-band TI

The usual C-band radar band is 5.4-5.9 GHz. Many use up to 1.5 MW peak power. You might could do a quick site RF survey with a SA and a standard gain horn (with a LNA). If it is in-band, you may have to even install a diffraction fence. We had to do this last month for a new uplink station we own. I...
by Ray
Sun Apr 29, 2018 12:13 pm
Forum: Radio Studio Engineering
Topic: Software to control Broadcast Tools 8x2 Audio Switcher
Replies: 8
Views: 517

Re: Software to control Broadcast Tools 8x2 Audio Switcher

I've used a few of these with good results. Never had a failure. I didn't know about the software (thanks for the info) , but the RS232 interface is easy to program. They had a model 44.22 version that was discontinued recently. This version has four AES digital inputs and four analog inputs that yo...
by Ray
Fri Mar 23, 2018 6:45 am
Forum: TV Engineering
Topic: Transmitter Nitrogen Issue
Replies: 25
Views: 507

Re: Transmitter Nitrogen Issue

There is a product called Snoop that is similar to the Bubble soap that works well. I think Snoop is more sensitive than bubble soap. I've used both; I use the Snoop if I have it, otherwise it is a trip to the toy store for bubbles. We also have an electronic air leak detector that works OK (some fo...
by Ray
Wed Feb 21, 2018 7:20 am
Forum: Radio Automation Systems
Topic: Rivendell Radio Automaiton
Replies: 20
Views: 4164

Re: Rivendell Radio Automaiton

I spent lots of time looking at Automation software a couple of years ago. Many folks really like the Rivendell and think it is stable. The price is also really good (free). I'm not an IT expert and was worried about the setup and support however. If you have the time/experience, it might be a good ...
by Ray
Wed Feb 14, 2018 7:32 am
Forum: FM Radio
Topic: Singling out 2 stations on same frequency
Replies: 30
Views: 1746

Re: Singling out 2 stations on same frequency

I was wondering why predicted (50/50) interference contours do not correlate almost exactly with predicted signal strength predictions. For interference calculations, power seems to be more important than height. It seems to me that if the flux density for the 60 dB contour is the same with the FCC ...
by Ray
Sat Jan 27, 2018 5:53 pm
Forum: FM Radio
Topic: Connector suppliers....
Replies: 14
Views: 630

Re: Connector suppliers....

I needed some 7/8 diam and 1 1/4 diam Heliax type cables a couple of weeks ago. I was having trouble with Commscope having obsoleted several of the connectors we needed like 7/8 EIA and 7/16 DIN for the new AVA5 and AVA6. The folks at RF Parts recommended a Heliax type cable from a company called Eu...
by Ray
Tue Jan 16, 2018 12:12 pm
Forum: FCC Discussion
Topic: Revitalized AM Translators
Replies: 16
Views: 539

Re: Revitalized AM Translators

I've been listening to a new translator that just signed on. It appears that the licensee on the CP must have sold the CP to another local station. The translator is repeating another local AM station different than that on the CP. The owners of two stations are also different. It seems to me that a...
by Ray
Fri Dec 22, 2017 9:40 am
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 26
Views: 1435

Re: RF Spectrum Analyzer

I know one engineer that has not been so fortunate in marriage. He has been married about five times now. Being a real engineer , he says he is currently married to wife 3.2 (third wife, revision two). I suppose we got off-topic on this one. I hope everyone has a great Christmas and maybe Santa will...
by Ray
Tue Nov 07, 2017 4:38 pm
Forum: FM Radio
Topic: OMB GP-6
Replies: 11
Views: 771

Re: OMB GP-6

The phase kit is home-made. Several good articles about how to use a double balanced mixer with a 2-way power divider to provide a output voltage proportional to the relative phase between the two signals at the LO and RF ports of the mixer. I have several lengths of RF cable cut and calibrated on m...
by Ray
Fri Nov 03, 2017 8:35 am
Forum: FM Radio
Topic: OMB GP-6
Replies: 11
Views: 771

Re: OMB GP-6

Here are some random ideas. I know you have lots of experience with this type of problem. It looks like the Heliax is bent very close to the connectors in a couple of cases. I've seen the shield fracture many times when this happens causing intermittent VSWR problems. I've had to travel half-way aro...
by Ray
Sun Oct 01, 2017 4:52 pm
Forum: FM Radio
Topic: New member - LPFM transmitter recommendations
Replies: 33
Views: 3529

Re: New member - LPFM transmitter recommendations

Your right as usual. I heard they were using a Chinese transmitter (no FCC certification at all) and had a spur in the aviation band. Why anyone would try this for any period of time is beyond me. I have heard of folks using them in an emergency for less that 24 hours. Nothing gets action faster fro...
by Ray
Sun Oct 01, 2017 9:20 am
Forum: FM Radio
Topic: New member - LPFM transmitter recommendations
Replies: 33
Views: 3529

Re: New member - LPFM transmitter recommendations

The older Crowns have a reputation for being very robust. The Crown story is very interesting and they are very good folks. I assume that this unit is LPFM certified by the FCC? I don't see this specifically listed on the brochure. LPFM transmitters have to be sent into the FCC to be certified unlik...
by Ray
Fri Sep 15, 2017 6:36 am
Forum: FM Radio
Topic: New member - LPFM transmitter recommendations
Replies: 33
Views: 3529

Re: New member - LPFM transmitter recommendations

I've always thought Nautel really goes the extra mile for customer service. They were one of the few vendors that came down for our state broadcasting convention last month. Jeff has always answered my emails in a matter of hours (at most). They have webinars several times a year that are really hel...
by Ray
Fri Sep 08, 2017 6:17 am
Forum: FM Radio
Topic: New member - LPFM transmitter recommendations
Replies: 33
Views: 3529

Re: New member - LPFM transmitter recommendations

I also vote for the VS300. You can get the VS300 with the Orban 5500 audio processor built in. The remote control software is excellent along with the factory support. Three areas that I don't recommend going cheap are (1) main transmitter, (2)automation software, and (3) EAS. Most everything else I...
by Ray
Tue Jul 04, 2017 11:20 am
Forum: FM Radio
Topic: Static Dissipators?
Replies: 13
Views: 1677

Static Dissipators?

Happy 4th of July to everyone. I really appreciate all of the real-world experience on this forum and I always learn something. I just read an article in the June issue of QST written by an owner of a lightning protection company. In the article she says that static dissipator devices have been "deb...