Search found 64 matches

by DaveSt
Thu Sep 17, 2020 6:50 am
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 573

Re: Quality translator

The VS300 does seem to be overly sensitive (in my opinion) to the slightest reflected power. One station had a 3-cavity bandpass filter on its output and that forced the VS300 to cut back power drastically. A-ha! Wouldn't you know it, we have Delta Meccanica 3 cavity bandpass filters on the output ...
by DaveSt
Wed Sep 16, 2020 11:10 pm
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 573

Re: Quality translator

Interesting. So far, we've been the only broadcast station at any of our sites, but at one translator site another station has acquired a license to transmit, and their licensee is for 1500W, we're just 300W, their transmitter is allegedly installed, but they've not switched on yet, they're 2.4MHz ...
by DaveSt
Wed Sep 09, 2020 2:28 am
Forum: TV Engineering
Topic: Old analog Gear, need manuals, etc.
Replies: 55
Views: 8599

Re: Old analog Gear, need manuals, etc.

Those connectors look like Hirose RM15T. I have seen them elsewhere.
by DaveSt
Thu Aug 27, 2020 1:00 pm
Forum: On-Air Studios
Topic: Out of Control Audio
Replies: 9
Views: 460

Re: Out of Control Audio

If it is ENCO, you may have the normalize function available directly from the library. Select a bunch of cuts and right click. Don't try to do too many at once as it does screw up occasionally.
by DaveSt
Thu Aug 06, 2020 1:47 pm
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 899

Re: source 950 combiner

There would be something seriously wrong if you could not get that working with a watt!
by DaveSt
Thu Aug 06, 2020 2:09 am
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 899

Re: source 950 combiner

The Marti and MFC use 3db couplers and presumably circulators too. They will work so long as you can afford to burn more than half of the transmitter powers. So long as the link is not marginal that should be fine and you can always make it up with antenna gain if needed.
by DaveSt
Wed Aug 05, 2020 3:25 am
Forum: Ask the Engineers
Topic: Spectrum Analyzer Recommendation
Replies: 3
Views: 118

Re: Spectrum Analyzer Recommendation

Another model available from ebay is the Rohde & Schwarz FSH6 or FSH3 if 3GHz is good enough. Make sure it has the tracking generator option. Alternatively there are some quite reasonable USB devices from Signal Hound.
by DaveSt
Wed Aug 05, 2020 3:04 am
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 899

Re: 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 t...
by DaveSt
Wed Apr 29, 2020 7:40 am
Forum: FM Radio
Topic: Digit or Digit-CD full manuals
Replies: 28
Views: 1421

Re: Digit or Digit-CD full manuals

kcbooboo wrote: Wed Apr 29, 2020 5:20 am Thanks for the suggestions.

I think that "B [2/A7]" is just another place that uses that bias voltage.
Yes it is the other half of the U20 comparator IC. You could swap the IC out too. Your idea of tying the input to 5V is a good way to go.
by DaveSt
Tue Apr 28, 2020 11:58 pm
Forum: FM Radio
Topic: Digit or Digit-CD full manuals
Replies: 28
Views: 1421

Re: Digit or Digit-CD full manuals

From the schematics that were linked earlier, have a look at page 19. That shows the circuit for the RF mute input. You could try checking the components connected to that. Particularly R3, R30, CR1, C5. Also monitor the voltages around U20 and at TP4 during the good and fault conditions. The fault ...
by DaveSt
Sun Mar 08, 2020 11:29 am
Forum: STL Engineering
Topic: Barix Audio Issue
Replies: 10
Views: 425

Re: Barix Audio Issue

Try swapping out the power supplies.
by DaveSt
Fri Feb 28, 2020 12:26 am
Forum: Production Studios
Topic: Small and robust sound card. Recommendation?
Replies: 2
Views: 1928

Re: Small and robust sound card. Recommendation?

For a card, have a look at the Sonifex PC-AD2. It is not cheap at around $700, but is fully balanced. Or for a USB device, the Yellowtec PUC2 is good.
by DaveSt
Mon Jan 06, 2020 1:54 am
Forum: FM Radio
Topic: Smart AC Power Circuit Breaker with Web Control?
Replies: 18
Views: 904

Re: Smart AC Power Circuit Breaker with Web Control?

The old panel box is about 40 years old. I would never want a circuit breaker that I can't reset in person. If something causes a trip, you're not sure, hit "reset", and it comes back, you could be looking at replacing the panel with the rest of the building that burned down. For the nuisance for a...
by DaveSt
Fri Dec 06, 2019 12:05 pm
Forum: FM Radio
Topic: Wind Farm
Replies: 6
Views: 907

Re: Wind Farm

As far as wind turbines go, the support structure is steel and represents a permanent reflector, but as Deep Thought suggests, that is probably a minimal problem if many wavelengths away. Of course, FM is not analog TV, but I know of one instance where a tower caused a permanent reflection (ghost) ...
by DaveSt
Mon Nov 25, 2019 11:36 pm
Forum: Radio Studio Engineering
Topic: Soundcraft RM100 tech manual
Replies: 2
Views: 921

Re: Soundcraft RM100 tech manual

I also have an electronic version of the technical manual. Let me know if you want it. It is just under 9MB.