Search found 987 matches

by TPT
Thu Aug 06, 2020 6:08 am
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 1259

Re: source 950 combiner

The path is quite short, just over two miles. At the top of the 60' STL tower, can see the FM tower. Most of the loss is in the cable run--around 200 feet, using 7/8th now. Plan on using that cable for the BE-1A when it is moved. If the combiner price is reasonable will just get two more lengths of ...
by TPT
Tue Aug 04, 2020 8:52 am
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 1259

source 950 combiner

Adding station-need 2nd STL. Need a combiner for the two STl's as eventually the STL antenna will be on the AM tower for the second station (the 2nd STL will be for the associated translator). 949.0 and 946.375 Suggestions on brand /source? Of course, we are only talking about ten watts from each tr...
by TPT
Mon Aug 03, 2020 5:13 am
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 476

Re: Armstrong X-Link transmitter

I came across what I remember as an RVR style box (Bext brand maybe) which was composite in--but had discrete outputs on the receiver. At least that's what it looked like.

Most of these RVR's I've come across are straight composite STL's. Front panel varies, rear panel similar.
by TPT
Sun Aug 02, 2020 7:17 am
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 476

Re: Armstrong X-Link transmitter

New supply brought it back to life. Not the cheapest route but have other projects coming up I need to worry about.

The supply feeds a ribbon cable, so not easily replaced with a generic supply. Will re-cap the old supply as a spare, as have two of these transmitters
by TPT
Sat Aug 01, 2020 6:41 am
Forum: Internet Streaming
Topic: [Project] Measuring a listener's tolerance to the quality of audio files
Replies: 1
Views: 1964

Re: [Project] Measuring a listener's tolerance to the quality of audio files

Perception of audio quality can depend on what the listener is using to hear the audio. Go back 50 years. Most people would find audio quality on a typical telephone handset as acceptable. But the same audio pulled off the line with a hybrid & broadcast on an FM station would be perceived as &qu...
by TPT
Tue Jul 28, 2020 6:21 am
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 476

Re: Armstrong X-Link transmitter

Just noted something on the schematic which would be handy for American manufacturers to add--radial capacitors are described not only in capacitance and voltage rating but also in diameter (millimeter, but that's fine). We've all had fun squeezing over-sized caps into a tight circuit board. Most su...
by TPT
Tue Jul 28, 2020 6:18 am
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 476

Re: Armstrong X-Link transmitter

Grazie molto!

Better Italian than pinyin.

Leaves me to suspect failing supply, at least leaky caps. Ten year old unit.
by TPT
Mon Jul 27, 2020 6:12 am
Forum: AM Radio
Topic: New engineer - questions
Replies: 18
Views: 935

Re: New engineer - questions

No offense taken. We don't need anymore stations in our market. There are 6 AM's in our market. All but one have FM translators, four of the five AM's rent space on my FM tower for their translator antennas. We get one of these translators with the AM we are buying, along with a second out-of-market...
by TPT
Sun Jul 26, 2020 2:28 pm
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 476

Armstrong X-Link transmitter

Anyone know what the front panel off-on switch really does? Took this transmitter down while rearranging things in the racks, had trouble to get it to come back up. Now on some models there is a fan sense lead, so if the fan doesn't draw any current the power supply stays off. Not on this one, thoug...
by TPT
Sat Jul 25, 2020 6:57 am
Forum: AM Radio
Topic: New engineer - questions
Replies: 18
Views: 935

Re: New engineer - questions

Save your pennies, and explore working for a local station in some capacity for a couple of years. (Yes, the "paying your dues" thing.) I don't know the ins and outs of Canadian ownership, but suspect they require most of the license be controlled by a citizen or citizens. Now--to possible...
by TPT
Fri Jul 24, 2020 6:21 pm
Forum: AM Radio
Topic: New engineer - questions
Replies: 18
Views: 935

Re: New engineer - questions

We (hopefully) will be inking a contract to buy an AM this coming week. Of course, I've been in the business in one form or another since 1969, my business partner, since 1975. We already own three FM stations, and the AM station we are buying has an associated FM translator. This would be the easie...
by TPT
Fri Jul 17, 2020 6:26 am
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 656

Re: Marti STL-10 regulator

Apart from some blue language based on the way that regulator is mounted (the screw for the 3 pin goes through the back heatsink, fun getting it lind up)--this unit back among the living. I bought a Meanwell supply from Jameco, going to try 12 volts on another STL 10 with a burned out power transfor...
by TPT
Sun Jul 12, 2020 8:37 am
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 656

Marti STL-10 regulator

This is the power supply regulator mounted on the back side of the heat sink. Part only described as "IC-1," not otherwise described in manual. I can see "LM" but rest of number is scrapped off.
by TPT
Wed Jul 01, 2020 2:51 pm
Forum: FCC Discussion
Topic: AM primary station to Translator separation
Replies: 2
Views: 327

Re: AM primary station to Translator separation

It's the greater of 25 miles from the tower or 2mv/m contour. Always check at ECFR.GOV for the current rule: "The coverage contour of an FM translator rebroadcasting an AM radio broadcast station as its primary station must be contained within the greater of either the 2 mV/m daytime contour of...
by TPT
Tue Jun 23, 2020 6:01 am
Forum: FM Radio
Topic: Exciter shopping
Replies: 15
Views: 1881

Re: Exciter shopping

Some models of the RVR STL transmitters--and receivers, don't have very well shielded IF oscillators. Had problems at a combined site when two receivers were put too close together in the rack. At another site, the STL transmitter blocked out a weather receiver used for EAS. Moving it to a window cu...