Search found 37 matches

by Ray
Thu Apr 13, 2017 6:29 am
Forum: FM Radio
Topic: Broadcast Technology Company?
Replies: 18
Views: 1341

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: 1341

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: 1341

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: 1341

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: 1341

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: 525

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: 279

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: 525

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...
by Ray
Sat Feb 11, 2017 10:25 am
Forum: FM Radio
Topic: FM Clock Radio with good blanketing protection recommendation
Replies: 7
Views: 525

FM Clock Radio with good blanketing protection recommendation

Can anyone please recommend a small FM clock radio that has the best blanketing protection? I know the Grundig models are good for other posts but I don't see that they make a table top clock radio.

Thanks

Ray
by Ray
Mon Jan 09, 2017 7:29 am
Forum: FM Radio
Topic: Nicom BKG 77
Replies: 13
Views: 849

Re: Nicom BKG 77

I've heard several folks say that a narrow band slant vee antenna will provide a better signal than a broadband model like the BKG-77. I was wondering if anyone knows why? The radiating elements are very similar, basically same slant vee dipole construction. I would think the radiating pattern would...
by Ray
Wed Nov 09, 2016 7:41 am
Forum: FM Radio
Topic: Theory Discussion: Circular Polarization Vs. Vertical Polarization
Replies: 46
Views: 1868

Re: Theory Discussion: Circular Polarization Vs. Vertical Polarization

If you don't believe that RHCP becomes LHCP when bounced off of a perfect conductor, try configuring the polarization for a prime focus satellite feed for the incoming downlink circular polarization, it will be cross polarized. You have to configure the prime focus feed/polarizer for LHCP to receive...
by Ray
Mon Nov 07, 2016 4:39 pm
Forum: FM Radio
Topic: Theory Discussion: Circular Polarization Vs. Vertical Polarization
Replies: 46
Views: 1868

Re: Theory Discussion: Circular Polarization Vs. Vertical Polarization

Good discussion, I think polarization mismatch loss is a big issue. This is really a RF link budget problem that is not simple. If the mobile antenna or line-cord antenna is oriented with the E-field orthogonal to the incoming linear pol wave, the pol mismatch loss can be very large (10-20 dB). Mult...
by Ray
Tue Jul 19, 2016 1:58 pm
Forum: General Computers
Topic: Scheduled Downloading of files?
Replies: 9
Views: 809

Re: Scheduled Downloading of files?

I evaluated three programs last year for this.
We bought Radio Spider and have been very happy with it.
It is only a few hundred dollars and well worth it for us.
I think software is usually not a good place to cut corners if possible (especially since I'm not an IT expert).

Ray
by Ray
Fri Jul 01, 2016 6:37 am
Forum: FM Radio
Topic: Cable phasing...
Replies: 1
Views: 327

Re: Cable phasing...

I've made several phasing cable to do this. It is not hard to get less than 1 degree tolerance in the FM band which is only about 0.25 inch (80% VF). I can usually trim the cable to less than 0.1 inch differential. I have a vector network analyzer (that is not very portable) that I use to check the ...
by Ray
Thu Jun 30, 2016 1:23 pm
Forum: FM Radio
Topic: Antenna height and distance
Replies: 6
Views: 606

Re: Antenna height and distance

Fabio, I would recommend a free propagation prediction program called RadioMobile. I'm not sure if the terrain data is available for your area but it is worth a look. In the US, it imports that local terrain data and will draw contour coverage maps for various transmit power levels and antenna confi...