Search found 34 matches

by spareparts
Sat Mar 31, 2018 6:43 am
Forum: Everything else
Topic: PPM Encoding
Replies: 4
Views: 430

Re: PPM Encoding

NYC - Trying to determine if the carcass of WBAI is even bothering. I don't see them in the book at all.
by spareparts
Fri Mar 30, 2018 7:36 pm
Forum: Everything else
Topic: PPM Encoding
Replies: 4
Views: 430

PPM Encoding

Any reasonably simple way to determine if your favorite FM is bothering to encode PPM?
by spareparts
Wed Mar 21, 2018 6:38 pm
Forum: FCC Discussion
Topic: RX-only C-band receive station registration, form 312
Replies: 41
Views: 2435

Re: RX-only C-band receive station registration, form 312

So how do the non-profits that operate C band systems (NASA TV as an example) make their voices heard without diverting funding from other projects?
by spareparts
Thu Mar 15, 2018 5:07 am
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Re: Management ignored me when I suggested LPFM....

Lots of good info re carrier current - will throw this out there as it's likely relevant to the loaded neutral suggestions: Facility buys it's power in bulk, delivered on overhead three phase at 13.2 kV. It's stepped down on site to 4160 V, and from there, stepped down again to 120/208 three phase. ...
by spareparts
Mon Feb 26, 2018 5:36 pm
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Re: Management ignored me when I suggested LPFM....

I doubt they would have qualified for an LPFM anyway. These are not for commercial interests. Actually they would have. They are a 501(c)(3), a public museum, and a National Historic Landmark. On the education side, they are partnered with a major university, and the local school district. That bei...
by spareparts
Sun Feb 25, 2018 10:01 am
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Re: Management ignored me when I suggested LPFM....

They can still buy a translator to use with the AM (if that's what this is all about...hard to tell since "LPFM" is another thing entirely) but it'll have to comply with the minor change rules if they want to relocate it. They don't own any broadcast facilities at all - just a high end podcast stud...
by spareparts
Sat Feb 24, 2018 6:38 pm
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Re: Management ignored me when I suggested LPFM....

Will tell them they missed the boat on the LPFM, and they are out of luck....
by spareparts
Sat Feb 24, 2018 2:10 pm
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Re: Management ignored me when I suggested LPFM....

You can't. The limit is 100 milliwatts DC input power to the transmitter on AM and 250 uV/m at three meters field intensity on FM. That MS-15 will radiate more than that from the cabinet. Nuts - How bad is the Harris Micro Max in terms of incidental RF leakage? It can be dialed back to 1W in softwa...
by spareparts
Sat Feb 24, 2018 10:26 am
Forum: FCC Discussion
Topic: Management ignored me when I suggested LPFM....
Replies: 21
Views: 1499

Management ignored me when I suggested LPFM....

Management ignored me when I suggested LPFM....
Now they want a transmitter.......
And there are a zillion new translators in every FM slot..........

So, I'm left with Part 15, so what's the legality of reducing the PO of a Harris MS-15 FM Exciter to Part 15 compliance.

Where do I start?
by spareparts
Sat Feb 24, 2018 10:01 am
Forum: Ask the Engineers
Topic: 3M/Scotch 66 Block Connector
Replies: 11
Views: 755

Re: 3M/Scotch 66 Block Connector

Since the Scotchlock ST was EOL'd, another option from Sandman is the 66 Punching Doubler. I have soldered wires to the exposed tab and used 4:1 heatshrink. http://phoneman.com/66-punching-doubler.html

SP
by spareparts
Mon Feb 19, 2018 6:17 pm
Forum: Ask the Engineers
Topic: Band stop-Notch Filter suggestions
Replies: 9
Views: 428

Re: Band stop-Notch Filter suggestions

Thanks - Need a proofreader for postings....
by spareparts
Mon Feb 19, 2018 5:05 pm
Forum: Radio Automation Systems
Topic: Rivendell Radio Automaiton
Replies: 20
Views: 5180

Re: Rivendell Radio Automaiton

I have RD up in the lab, and have copied enough of my CD collection to the box using RDLibrary to get a good feeling for what it can & can't do. Eldest son is a Linux person, so I have a resource there. here's the question: Anyone using RD with Touchscreens? Example - https://www.youtube.com/watch?v...
by spareparts
Mon Feb 19, 2018 4:35 pm
Forum: Ask the Engineers
Topic: Band stop-Notch Filter suggestions
Replies: 9
Views: 428

Re: Band stop-Notch Filter suggestions

1/4 wave at 468.3625 MHz is 6.3 inches at 100% propagation velocity. Adjusting that for typical small coax (~66%) you'd need 4.2 inches, but I'd start long and trim off 1/4" at a time while watching the received unwanted signal levels. Once you find the "null" just tape the end, leaving it an open ...
by spareparts
Sun Feb 18, 2018 12:01 pm
Forum: Ask the Engineers
Topic: Band stop-Notch Filter suggestions
Replies: 9
Views: 428

Re: Band stop-Notch Filter suggestions

Email away - lets see what magic they can work

SP
by spareparts
Sun Feb 18, 2018 9:29 am
Forum: Ask the Engineers
Topic: Schematic Needed
Replies: 12
Views: 549

Re: Schematic Needed

I've gone to old analog "hi-fi" tuners off e-bay, both for off-air monitoring and EAS. Have to use a rack shelf (or sit them on top of something else) & out of the box I replace the filter caps. But they have the nice feature of coming back on after power failures tuned to the right station. The Bo...