Search found 115 matches

by W2XJ
Tue Jul 23, 2019 4:54 am
Forum: FM Radio
Topic: Very low power recommendation
Replies: 22
Views: 1129

Re: Very low power recommendation

I kind of agree but an attenuator is cleaner and more precise.






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by W2XJ
Tue Jul 23, 2019 4:25 am
Forum: FM Radio
Topic: 75 uSec Pre-Emphasis Graph
Replies: 11
Views: 449

Re: 75 uSec Pre-Emphasis Graph

You can do anything necessary with almost any scope. Regarding 75us pre-emphasis, I haven’t used that for over 30 years. 50 us or less is a much better option.
by W2XJ
Thu May 02, 2019 8:19 pm
Forum: Radio Studio Engineering
Topic: Audio cable for AM transmitter site? Star Quad or Ethernet or What?
Replies: 22
Views: 617

Re: Audio cable for AM transmitter site? Star Quad or Ethernet or What?

I am not sure why anyone would build an analog plant in 2019. AOIP with fiber from each room to the tech core is the solution. Analog microphone runs should be short and good cable used there. I like double shielded quad core in any case.
by W2XJ
Thu May 02, 2019 7:45 pm
Forum: FM Radio
Topic: Very low power recommendation
Replies: 22
Views: 1129

Re: Very low power recommendation

I would find a part 73 accepted transmitter and use an attenuator. One way or another there will be heat dissipated. The attenuator will also provide better isolation from the antenna.
by W2XJ
Wed Jan 02, 2019 11:00 pm
Forum: FM Radio
Topic: Horizontal or vertical
Replies: 8
Views: 730

Re: Horizontal or vertical

We’ve known for a long time that by the time a VHF signal reaches a vehicle the polarization is random. The vehicle’s body adds to this. Being that this is a translator, most of the coverage is probably line of sight. Vertical or CP will have more multipath than horizontal.
by W2XJ
Sat Dec 29, 2018 8:02 am
Forum: FM Radio
Topic: Horizontal or vertical
Replies: 8
Views: 730

Re: Horizontal or vertical

if this is a hilly area, go horizontal.
by W2XJ
Sun Apr 01, 2018 10:59 pm
Forum: AM Radio
Topic: Audio Bandwidth of an AM Broadcast Station
Replies: 19
Views: 2057

Re: Audio Bandwidth of an AM Broadcast Station

What usually is overlooked is that audio bandwidth control should be separated from RF bandwidth control. In other words if you want 5 KHz audio response, put a filter with a Butterworth response BEFORE the processor and then set the processor output filter to something higher. That way you’re not p...
by W2XJ
Sun Apr 01, 2018 9:58 pm
Forum: AM Radio
Topic: GatesAir suspends AM TX sales (Radio World)
Replies: 33
Views: 2046

Re: GatesAir suspends AM TX sales (Radio World)

If New York is any indicator they won’t be selling many TV transmitters either. All but one station so far have purchased Rhode Schwarz. Regarding power supplies, it would appear that most manufacturers choose to avoid the whole approvals process along with the liabilities involved by outsourcing. P...
by W2XJ
Sun Feb 04, 2018 5:11 pm
Forum: AM Radio
Topic: 317c1 parts
Replies: 11
Views: 1016

Re: 317c1 parts

There are still those who would happily take a whole 317 C1 in tact. Being that your building has ample space, you could leave it sit until someone came and picked it up and paid a few bucks. OR you could let it sit with a manual power disconnect and a manual coax patch and let it sit off line for l...
by W2XJ
Mon Jan 22, 2018 9:30 pm
Forum: STL Engineering
Topic: Marti 950 MHz STL-10 spurious emissions
Replies: 6
Views: 2270

Re: Marti 950 MHz STL-10 spurious emissions

Mostly true but 50 DB is not enough attenuation. A 50 DB directional coupler AND another 20 DB pad would be much better.
by W2XJ
Mon Jan 22, 2018 5:28 pm
Forum: FM Radio
Topic: Repair Log: BE FXi-60
Replies: 4
Views: 869

Re: Repair Log: BE FXi-60

Maybe ‘ever’ for an analog exciter although we preferred the FX50.
by W2XJ
Mon Jan 22, 2018 5:12 pm
Forum: FM Radio
Topic: Harris/Gates support
Replies: 24
Views: 2503

Re: Harris/Gates support

When I started in the business the stations in my market were either Collins or RCA shops back when most broadcast equipment manufacturers built end to end solutions. It was a while before I ever saw Gates gear (well before the Harris era). When we started putting new FMs on air, one station I was i...
by W2XJ
Wed Jan 10, 2018 1:46 pm
Forum: FM Radio
Topic: Blue tooth mixer and high school games
Replies: 22
Views: 1985

Re: Blue tooth mixer and high school games

Well Verizon is headed in a different direction. They did not bid on any 600 MHz spectrum. They are focusing on smaller and smaller cells to offer more speed. Problem there is no ROI on these cells out in the country. Supposedly TMobile is doing the opposite and are taking advantage of 600 MHz range...
by W2XJ
Wed Jan 10, 2018 12:02 am
Forum: FM Radio
Topic: Blue tooth mixer and high school games
Replies: 22
Views: 1985

Re: Blue tooth mixer and high school games

For what its worth, keep an eye on Tmobile. They are agressively rolling out their newly acquired 600 MHz spectrum. While this doesn’t solve the current problems, they are focusing on more rural areas since the repack hasn’t happened. Once they light up service, a new phone will be required since no...
by W2XJ
Mon Jan 08, 2018 7:36 pm
Forum: FM Radio
Topic: 2 stations fighting to get on the frequency
Replies: 5
Views: 540

Re: 2 stations fighting to get on the frequency

Agreed I had a station in NYC that was short spaced to one in Philly. Every August when the ducting set up Philly would cover over almost all our coverage area. You could see our antenna on Empire and hear Philly. Of course, we were clobbering them. MAD :-) I had a solution - swap frequencies in Phi...