Search found 849 matches

by TPT
Wed Jun 19, 2019 8:14 am
Forum: FM Radio
Topic: Power Transistor
Replies: 3
Views: 74

Re: Power Transistor

Have an 802A in pieces ( should be all there). As I remember, was problem with oscillator on AFC card & some control circuitry, but the RF amplifier made full power. One of those repair project I've never gotten around to. Somewhat expensive to ship because of the weight; make me a reasonable offer.
by TPT
Fri Jun 14, 2019 5:21 pm
Forum: FM Radio
Topic: Negotiating with the tower conglomerates
Replies: 6
Views: 273

Re: Negotiating with the tower conglomerates

And lots of speculation involved driving up tower prices. Maybe other monkey business. We bought an FM station just about 10 years ago, co-located with a CC station on a 200' tower. Assignment (open area) fairly tight (I did the original channel allocation). Couple of years later, as our lease term ...
by TPT
Thu Jun 13, 2019 6:02 am
Forum: FM Radio
Topic: Negotiating with the tower conglomerates
Replies: 6
Views: 273

Re: Negotiating with the tower conglomerates

Don't count on the expertise of the cell phone techs when you get an "interference" complaint. Have a broadcast site with a cell installation on top--the station owns the tower. The cell firm was installing some 700 mhz. equipment and found "spurs" around 8 times carrier frequency. Seemed to be comi...
by TPT
Wed Jun 12, 2019 4:59 pm
Forum: FM Radio
Topic: Negotiating with the tower conglomerates
Replies: 6
Views: 273

Re: Negotiating with the tower conglomerates

Yes--to your question in the last line of your post. There is a view in the corporate centers of Bos-Wash (AKA/Acela Corridor) that towers are made of 14 K gold, and tower space should be priced accordingly. While this may be true in certain areas of the NIMBY-east, in many parts of the country you ...
by TPT
Mon Jun 10, 2019 5:55 am
Forum: AM Radio
Topic: harris gates one retune
Replies: 5
Views: 236

Re: harris gates one retune

Have a Gates One, which gives me little trouble. Unlike it's big brother in the same enclosure, a Gates Five. Haven't worked with either the Nautel kilowatt or the BE kilowatt (there are a couple around here, though). However, it makes little sense to invest either time or money into a 25 year old t...
by TPT
Thu Jun 06, 2019 4:18 pm
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 593

Re: AM station to shut down at end of May 2019

Probably need to drive over, and walk in the place if your are interested. Most college administrators are the walking definition of clue-less. They may think they can just sit on the license for a year or so, then sell.
by TPT
Thu May 23, 2019 5:20 pm
Forum: FCC Discussion
Topic: AM station to shut down at end of May 2019
Replies: 18
Views: 593

Re: AM station to shut down at end of May 2019

Answering the original post, if the license is actually returned, a co-channel, possibly even a first adjacent, may well be able to apply for a power increase or pattern modification that would limit, if not completely preclude returning that frequency to the air in that town. As a practical matter,...
by TPT
Wed May 22, 2019 5:55 am
Forum: FCC Discussion
Topic: Renewal season
Replies: 0
Views: 94

Renewal season

License renewal season is well under way, Maryland and the Virginias already in progress. First issue that has come up--the pre filing notice. LPFM stations must run these notices, as well as all other commercial and non-coms. Simple to do--only one a day, twice a month, someone can just read it--no...
by TPT
Tue May 14, 2019 2:55 pm
Forum: On-Air Studios
Topic: Stupid Basic Size Question
Replies: 6
Views: 1488

Re: Stupid Basic Size Question

I have two stations in 1,750 square feet (well, 35' X 50' building--so actually less)...but that's too small. Then again I have a transmitter building that is 2,400 square feet (60' x 40')--but I am only using one 15' X 25' room for transmitters...six of them (2 class A's and 4 translators). The res...
by TPT
Tue May 07, 2019 5:02 pm
Forum: FM Radio
Topic: Harris HT-35CD No filament voltage.
Replies: 8
Views: 593

Re: Harris HT-35CD No filament voltage.

I think the HT series all used a similar control board; the problem here might be a failed IC on that board. Here's a circuit description from my HT-10 manual: Two of the inputs to integrated circuit U32B are connected to the +15 volt circuit and the fourth (pin 1) is held at the +15-volt level by r...
by TPT
Tue May 07, 2019 5:47 am
Forum: FM Radio
Topic: Harris HT-35CD No filament voltage.
Replies: 8
Views: 593

Re: Harris HT-35CD No filament voltage.

What turns on the solid state relay? Perhaps there is nothing wrong with the relay, just the circuit that turns it on?
by TPT
Fri May 03, 2019 5:37 am
Forum: Radio Studio Engineering
Topic: Audio cable for AM transmitter site? Star Quad or Ethernet or What?
Replies: 22
Views: 498

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

Uh..."AM"?

Those digital doo-hickeys get expensive.

Digital is fine for major market installs where several studios are going in at once. Two studios and a transmitter? Keep it simple.
by TPT
Tue Apr 30, 2019 1:42 pm
Forum: Radio Studio Engineering
Topic: Audio cable for AM transmitter site? Star Quad or Ethernet or What?
Replies: 22
Views: 498

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

Appealing to have labels that identify what the cable is used for (as opposed to numbers). Unfortunately, nothing stays the same for long--that's why I stick with numbers and a WordPerfect table to keep track of what goes where. If I could find an old list for my backbone 27 pair cable I would bet t...
by TPT
Tue Apr 30, 2019 5:20 am
Forum: Radio Studio Engineering
Topic: Audio cable for AM transmitter site? Star Quad or Ethernet or What?
Replies: 22
Views: 498

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

When we built the station back in 1983 I had acquired a 50' piece of Belden cable with 27 shielded pairs. Ran between what was originally the main studio and what was originally the transmitter room. Still in use..and does save time--but expensive if bought new. Sometime you can find these cables on...
by TPT
Mon Apr 29, 2019 1:19 pm
Forum: Radio Studio Engineering
Topic: Audio cable for AM transmitter site? Star Quad or Ethernet or What?
Replies: 22
Views: 498

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

Belden 8451 two wires, foil shield. Thousands of feet in use around the country in all kinds of studios. $32 for 100 foot at Markertek, Google it, you can probably find it cheaper. CAT5 is OK...it is twisted pair so some RF cancellation, but no shielding. Also solid wire, easy to break if a tight pu...