Search found 3356 matches

by Deep Thought
Tue Sep 18, 2018 5:56 pm
Forum: AM Radio
Topic: Retune Harris DX10
Replies: 1
Views: 27

Re: Retune Harris DX10

What frequency is it on and what frequency do you need it tuned to?

It is possible to do it but you'll need the proper test equipment and possibly some replacement parts.
by Deep Thought
Tue Sep 18, 2018 11:30 am
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 818

Re: Crystal alternative

That said, if you're using something like what I'm reading the ProgRock to be, might be easier just to run it at your carrier frequency, use it as the source for a differential amplifier with a 15V rail and jumper the transmitter to use the external RF drive source. Easy enough to do and removes an...
by Deep Thought
Fri Sep 14, 2018 12:52 pm
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 818

Re: Crystal alternative

Micheal Paton from Baton Rouge, La. had a device for some of the Harris AM transmitters. I think he said it could be set via dip switch to output a frequency of .5 to 5Mhz. I saw the board he had at the Alabama Broadcasters Association convention and it looked professionally made and the price wasn...
by Deep Thought
Thu Sep 13, 2018 10:52 am
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 818

Re: Crystal alternative

kcbooboo wrote:
Thu Sep 13, 2018 5:26 am
There's a very inexpensive synthesizer / oscillator called the ProgRock,
That's the one I'm using with some outboard interface electronics. It can be GPS-disciplined and once the parameters are stored in NVRAM it is very stable.
by Deep Thought
Fri Sep 07, 2018 10:31 pm
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 818

Re: Crystal alternative

The device I am using has very low phase noise, which is what makes it usable for this.
by Deep Thought
Wed Sep 05, 2018 9:51 pm
Forum: FM Radio
Topic: Synchronizing FM over IP?
Replies: 11
Views: 466

Re: Synchronizing FM over IP?

DaveSt wrote:
Wed Sep 05, 2018 9:00 pm
The best advice for a SFN is that you should only ever do it if there are no other options.
Indeed. I think I would opt for moving the LPs instead, or if the coverage does indeed overlap, just turn in the licenses.
by Deep Thought
Wed Sep 05, 2018 8:38 pm
Forum: FM Radio
Topic: Synchronizing FM over IP?
Replies: 11
Views: 466

Re: Synchronizing FM over IP?

About the only viable way to do this is to sync the RF via GPS and deliver the audio via satellite or private ethernet/fiber so each path is essentially identical and consistent. You will never be able to keep the audio stable over the Internet. A few tens of milliseconds shift in the path delay wil...
by Deep Thought
Tue Sep 04, 2018 10:24 pm
Forum: STL Engineering
Topic: TFT 9107 STL receiver PLL switch info
Replies: 1
Views: 195

Re: TFT 9107 STL receiver PLL switch info

Here ya go...
by Deep Thought
Tue Sep 04, 2018 10:21 pm
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 818

Re: Crystal alternative

I'm working on a synthesized, GPS-disciplined replacement that would attach to the transmitter via its AM stereo exciter input jack, but due to real life getting in the way it is several months from market.
by Deep Thought
Fri Aug 31, 2018 7:24 pm
Forum: Ask the Engineers
Topic: Cablewave Part No. - N Female for FLC78-50
Replies: 9
Views: 204

Re: Cablewave Part No. - N Female for FLC78-50

I may be wrong but I think that the solid center connector may work on the hollow center but obviously not vice-versa... Do they supply the little brass slug to put into the center conductor so the spring fingers on the solid conductor connector fit? I know the clamped terminations used for AM ATUs...
by Deep Thought
Fri Aug 31, 2018 3:53 pm
Forum: Ask the Engineers
Topic: Cablewave Part No. - N Female for FLC78-50
Replies: 9
Views: 204

Re: Cablewave Part No. - N Female for FLC78-50

By the way, I pulled that off a Wayback Machine capture. Here's the whole table:
RFS7-8.jpg
by Deep Thought
Fri Aug 31, 2018 3:47 pm
Forum: Ask the Engineers
Topic: Cablewave Part No. - N Female for FLC78-50
Replies: 9
Views: 204

Re: Cablewave Part No. - N Female for FLC78-50

I think this is the one where a hex screw taps into the hollow center conductor. If so the male N is a 734804 and the female N is a 734837.
by Deep Thought
Mon Aug 27, 2018 11:24 pm
Forum: Ask the Engineers
Topic: Tantalum caps
Replies: 9
Views: 282

Re: Tantalum caps

Tantalums generally have a much higher uF value for the size and also have a lower leakage current which is important in timing circuits, but for the most part are interchangeable.
by Deep Thought
Sat Aug 25, 2018 9:45 pm
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 568

Re: The-1 or FX-30

ChuckG wrote:
Sat Aug 25, 2018 9:19 pm
Shane wrote:
Sat Aug 25, 2018 8:48 pm
What vintage is that, seeing it appears to have a non-switching PS?
It was installed new in 1991 or 1992
I believe those first appeared in 1989.
by Deep Thought
Tue Aug 14, 2018 11:05 pm
Forum: FM Radio
Topic: 500w translator
Replies: 16
Views: 631

Re: 500w translator

I suspect many of those are typos, and it really reveals how little attention the FCC pays to these things.
K274CX (99 watts) is one of those, so is K223CV (99 watts), W204CM (38 watts) & W255BK (50 watts).