Search found 44 matches

by Ray
Tue Nov 07, 2017 4:38 pm
Forum: FM Radio
Topic: OMB GP-6
Replies: 11
Views: 449

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: 449

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: 32
Views: 1851

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: 32
Views: 1851

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: 32
Views: 1851

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: 32
Views: 1851

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: 1040

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...
by Ray
Thu Apr 13, 2017 6:29 am
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1920

Re: Broadcast Technology Company?

Thank you Nathaniel

This is a big help.

I feel much better using the amplifier as a backup with the manual.

Ray
by Ray
Tue Mar 21, 2017 6:10 am
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1920

Re: Broadcast Technology Company?

Thanks Nathaniel,

I really appreciate your effort. We plan on using this as a primary backup, so a manual is valuable if we have a problem.
Ray
by Ray
Tue Mar 07, 2017 7:26 am
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1920

Re: Broadcast Technology Company?

Thanks Nathaniel,

It is a blue unit that is about 4-5 RU high. It looks nice.
I bought it at a hamfest for a good price.
I did a test and it had about 300 watts output with about 4-5 watts input.
It is always nice to have backups

Ray
by Ray
Fri Feb 24, 2017 7:41 am
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1920

Re: Broadcast Technology Company?

Thanks for the inputs.

Sarkis from SVPA did'nt know about them.

I suppose they were not in business long.

The amplifier works and seems to be well built.

I just like to have documentation for every unit available before a failure occurs .

Ray
by Ray
Wed Feb 22, 2017 9:41 pm
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1920

Broadcast Technology Company?

I have a Broadcast Technology model B300 300 watt FM amplifier. Google shows a record for them in Garden City, Ks but I cannot find a website (perhaps they were bought or out of business). Does anyone know where I could obtain a manual? The amplifier tests OK. I think this would make a good backup a...
by Ray
Sat Feb 18, 2017 5:39 pm
Forum: FM Radio
Topic: FM Clock Radio with good blanketing protection recommendation
Replies: 7
Views: 756

Re: FM Clock Radio with good blanketing protection recommendation

We tested seven table top type radios for 3rd adjacent rejection. The source is a 100 watt LPFM with a 2 bay 0.5 spaced antenna at 100 ft height. The radios were about 100 ft away from the antenna support. The results were surprising: Excellent Rejection: Sony XDR510 HD Insignia NS-CLOPP-2 (from Bes...
by Ray
Fri Feb 17, 2017 3:56 pm
Forum: Ask the Engineers
Topic: Audio Chain > AES or Analog?
Replies: 5
Views: 475

Re: Audio Chain > AES or Analog?

I also just finished building out a new LPFM. I used Digigram audio cards for all of the air and production computers. These cards have both analog and digital AES outputs The audio cards are input into a Broadcast Tools ADMS 44.22 matrix switch that has both analog and AES inputs/outputs The ADMS f...
by Ray
Tue Feb 14, 2017 12:29 pm
Forum: FM Radio
Topic: FM Clock Radio with good blanketing protection recommendation
Replies: 7
Views: 756

Re: FM Clock Radio with good blanketing protection recommendation

Thanks for all the good suggestions. The person that complained is actually outside of the official FCC blanketing contour limit and is using a clock radio (not sure what kind). I've ordered the Grundig and Sony that was suggested. I've also collected about six other low cost models (GE, Sylvania, e...