Search found 380 matches

by grich
Thu Aug 09, 2018 9:49 am
Forum: AM Radio
Topic: Capacitor replacement.
Replies: 23
Views: 822

Re: Capacitor replacement.

Two AM sites I care for have a common practice of old; the tower light neutrals are bonded to the tower steel, and the neutral bonded to tower ground on the "cold" side of the lighting choke, which lets the lighting choke double as the static drain. In those setups, the doghouses are all several hun...
by grich
Thu Aug 09, 2018 9:14 am
Forum: TV Engineering
Topic: Sigma CD... HALP
Replies: 7
Views: 242

Re: Sigma CD... HALP

Last few times I had that happen, the tube had arced inside the input cavity. $$$$ On our old Sigma, we started with one tube, then added another PA section. Tube 1 lasted the life of the transmitter in our plant, which was until we fell back to our old VHF frequency and back into the cradle of sol...
by grich
Thu Aug 02, 2018 4:56 pm
Forum: FM Radio
Topic: HARRIS DIGIT EXCITER
Replies: 6
Views: 158

Re: HARRIS DIGIT EXCITER

awsherrill wrote:
Thu Aug 02, 2018 3:07 pm
Is C29 one of the caps responsible for the infamous Digit "whistle"?
One of several. Previous thread link below...

viewtopic.php?f=3&t=5907&hilit=digit
by grich
Thu Aug 02, 2018 2:27 pm
Forum: FM Radio
Topic: HARRIS DIGIT EXCITER
Replies: 6
Views: 158

Re: HARRIS DIGIT EXCITER

Check the electrolytic caps in the PA unit, in particular C29 (82u/63V). If a 47u is fitted, change it... C29 is mentioned in service bulletin FM-580-WCF. Get ahold of that and bulletin FM-535-WCF from the GatesAir website. ...You can break the old one so that you do not have to remove the board. D...
by grich
Wed Aug 01, 2018 2:56 pm
Forum: FM Radio
Topic: Blower Motor Replacement Harris HT-10
Replies: 6
Views: 230

Re: Blower Motor Replacement Harris HT-10

Call Goodrich Enterprises and talk to Charlie. McMartin transmitters used the same Rotron blower and he rebuilds them. He usually has one in stock and will credit you some $$ if you send him yours after you swap them out. http://www.goodrichenterprises.com/ I've done that a couple times...even sent...
by grich
Fri Jul 27, 2018 2:16 pm
Forum: STL Engineering
Topic: Nicom 900 link - STL Antennas Can you Mix and Match
Replies: 18
Views: 386

Re: STL Antennas, can you mix and match?

OMB RR antenna, 13dB gain, rated for the 950 band. Don't see yagis much in this band, the typical STL antenna around here is some sort of parabolic design. The picture shows horizontal polarity...the other antenna should be mounted the same way, with the flat sides facing up and down. So, the path h...
by grich
Fri Jul 27, 2018 10:50 am
Forum: STL Engineering
Topic: Nicom 900 link - STL Antennas Can you Mix and Match
Replies: 18
Views: 386

Re: Nicom 900 link

Need more information...especially being aware of the other thread about antennas. One thing I've ran into over the years with most of the transmitter shacks I work in not being air conditioned, is receiver drift if the shack temperature gets up around 100. I've had to add supplemental fans around t...
by grich
Fri Jul 27, 2018 10:40 am
Forum: STL Engineering
Topic: Nicom 900 link - STL Antennas Can you Mix and Match
Replies: 18
Views: 386

Re: STL Antennas, can you mix and match?

Antennas are antennas, to a point. If it's designed for the frequency, has the same gain as the original, and is installed so its polarity matches the other end, it should be good.

Is this the transmit or receive antenna?
by grich
Thu Jul 26, 2018 12:20 pm
Forum: FM Radio
Topic: Source for the rubber bungs that seal cables on transmitter shacks
Replies: 4
Views: 231

Re: Source for the rubber bungs that seal cables on transmitter shacks

I think any place you would buy cable and connectors from will have them...Tessco, RF Parts, etc.

Here's the RF Parts page: https://www.rfparts.com/coax/coaxialcab ... boots.html
by grich
Mon Jul 23, 2018 3:39 pm
Forum: FM Radio
Topic: Blower Motor Replacement Harris HT-10
Replies: 6
Views: 230

Re: Blower Motor Replacement Harris HT-10

Call Goodrich Enterprises and talk to Charlie. McMartin transmitters used the same Rotron blower and he rebuilds them. He usually has one in stock and will credit you some $$ if you send him yours after you swap them out. http://www.goodrichenterprises.com/ I've done that a couple times...even sent...
by grich
Sat Jul 14, 2018 2:31 pm
Forum: On-Air Studios
Topic: Desperately seeking Pacific Recorders BMX-III series manual
Replies: 1
Views: 361

Re: Desperately seeking Pacific Recorders BMX-III series manual

Check with Mooretronix. Bob might have something since he specializes in PRE stuff. Be advised that his web site states he is unable to do repairs or rebuilds for awhile due to health issues.
by grich
Thu Jul 12, 2018 9:21 am
Forum: Ask the Engineers
Topic: KVM Suggestions
Replies: 4
Views: 170

Re: KVM Suggestions

We're trying out an Aten Altusen setup. I don't know what the max resolution is. This model uses a dongle that plugs into the computer, and CAT5 cable to the KVM switch.
by grich
Mon Jul 09, 2018 9:14 am
Forum: FM Radio
Topic: Bric-link
Replies: 5
Views: 286

Re: Bric-link

If this is going into a PPM market you need to have the PPM encoder behind the link or run it in a linear mode if the encoder has to be at the studio end. The compressed audio formats do a wonderful job of stripping away the watermarking since "you can't really hear it anyway". ...Lee I'm about to ...
by grich
Sun Jul 08, 2018 1:07 pm
Forum: FM Radio
Topic: Bric-link
Replies: 5
Views: 286

Re: Bric-link

I can answer a question or two also. I have several clients with STL links using BRIClink over DSL.
by grich
Sat Jul 07, 2018 8:11 am
Forum: Everything else
Topic: I THINK IT IS TRYING TO TELL ME SOMETHING
Replies: 6
Views: 384

Re: I THINK IT IS TRYING TO TELL ME SOMETHING

The video shows the craziness...wow. Is there any hope of getting the line rerouted?