Search found 1057 matches

by ChuckG
Mon Sep 28, 2020 7:10 pm
Forum: Everything else
Topic: New SBE Member
Replies: 2
Views: 147

Re: New SBE Member

Thanks Mike! I actually joined back in 1980-ish but let it lapse at some point and never re-upped until this year. I am very good at procrastinating when I get around to it! One nice thing (yeah, I know) to come of this pandemic is that the meetings are held online now. 4 hours driving wasn't workab...
by ChuckG
Wed Sep 16, 2020 10:38 pm
Forum: FM Radio
Topic: Quality translator
Replies: 22
Views: 573

Re: Quality translator

Several other problems with the BW broadcast units: 1. They don't play well with other transmitters on active sites. I own a site that is used for my Class A (3500 watts tpo), plus another Class A running 800 watts--and four translators. Two Gates Air kilowatts, an Ecreso kilowatt and a little 300 ...
by ChuckG
Sun Sep 06, 2020 10:00 pm
Forum: FM Radio
Topic: Harris THE-1 FM Exciter Transformer
Replies: 4
Views: 370

Re: Harris THE-1 FM Exciter Transformer

MasterMark wrote: Wed Sep 02, 2020 11:49 am Folks - looking for a parts unit that may still have a good power transformer. I have one with shorted turns.

Thanks for any help..

MG
I may have one available nearby. Shoot me an IM here and I'll call or email you once I find out if they wish to sell.
by ChuckG
Mon Aug 24, 2020 12:32 am
Forum: AM Radio
Topic: 813 Tube Repair
Replies: 8
Views: 555

Re: 813 Tube Repair

I'm guessing the envelope temperature can hit 400-500 degrees F, which is the upper limit for the "high temp" epoxies. That leaves sodium silicate compounds, which is what I believe the factory used.
by ChuckG
Thu Aug 06, 2020 12:14 am
Forum: STL Engineering
Topic: source 950 combiner
Replies: 7
Views: 899

Re: source 950 combiner

http://microwavefilter.com.s3-website-u ... biners.htm

Those are the only ones I know of outside finding one of the Marti HRC-10's used somewhere.
by ChuckG
Wed Jul 29, 2020 5:29 pm
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 404

Re: Armstrong X-Link transmitter

Leaves me to suspect failing supply, at least leaky caps. Ten year old unit. Probably. They usually fail earlier than that. The stuff seems to run until you power it down, then won't come back. Changing the switcher usually fixes it. If that one has an external 24V input that's another test route.
by ChuckG
Mon Jul 27, 2020 11:21 pm
Forum: STL Engineering
Topic: Armstrong X-Link transmitter
Replies: 10
Views: 404

Re: Armstrong X-Link transmitter

As you suspect, the power switch goes to a control card....
Good news is, I have the drawings for that. Bad news is, they are not in English... see below
by ChuckG
Sun Jul 19, 2020 1:46 am
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 551

Re: Marti STL-10 regulator

TPT wrote: Fri Jul 17, 2020 6:26 am There are several wires to be moved, the red wire is the main DC feed, but there are two others that go to the front panel. Looks like meter light for one, have to trace out the other one.
The meter lights are AC so there are 2 wires back to the supply.
by ChuckG
Fri Jul 17, 2020 2:27 am
Forum: Everything else
Topic: Happy Birthday Tim (Burke)
Replies: 2
Views: 841

Re: Happy Birthday Tim (Burke)

Happy late birthday Tim!
by ChuckG
Fri Jul 17, 2020 2:25 am
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 551

Re: Marti STL-10 regulator

W9PXZ wrote: Thu Jul 16, 2020 5:18 pm This is the advice that the late gentleman that did Marti repairs out of the old Marti factory (my apologies, but I can't remember his name)
Rick Neace. Super guy, had several tricks for improving old marti gear. His passing was a loss to the industry.
by ChuckG
Fri Jul 17, 2020 2:22 am
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 551

Re: Marti STL-10 regulator

What supply are you using? Meanwell RPS-60-15 about $15. It's rated 15V 60W (4 amps). The STL-10 uses just under 3 amps at 13.5V running full throttle so it's got a bit of headroom and runs fairly cool. There is a voltage adjust pot that I turn down to 14v. Move the red wire and the AC connector. I...
by ChuckG
Wed Jul 15, 2020 7:46 pm
Forum: STL Engineering
Topic: Marti STL-10 regulator
Replies: 13
Views: 551

Re: Marti STL-10 regulator

I don't even bother fixing that supply anymore, you can drop a 15V 4a switching supply in there for about $25 and have a lighter, cooler, quieter unit. It also eliminates that nylon header connector that fails over time.
by ChuckG
Tue Jun 30, 2020 10:46 pm
Forum: AM Radio
Topic: FIM-21/ 41 Repairs
Replies: 9
Views: 826

Re: FIM-21/ 41 Repairs

Deep Thought wrote: Tue Jun 30, 2020 3:06 pm
I thought Bob had shut down due to complications following his motorcycle accident. Is Mooretronix back up and running?
I think he's been out of business for over a year now.
by ChuckG
Mon Jun 29, 2020 10:29 pm
Forum: AM Radio
Topic: FIM-21/ 41 Repairs
Replies: 9
Views: 826

Re: FIM-21/ 41 Repairs

RGORJANCE wrote: Mon Jun 29, 2020 12:17 pm Having a senior moment here today...............I seem to recall a calibration service in Rockford, IL that did one some years ago, but can't find it at the moment. It I can recover the name. I will post it.

Fossil

TMI Calibration Labs?
by ChuckG
Mon Jun 22, 2020 6:05 pm
Forum: STL Engineering
Topic: Marti SRPT-30 frequency change
Replies: 4
Views: 430

Re: Marti SRPT-30 frequency change

TPT wrote: Mon Jun 22, 2020 6:33 am Bohn referred me to BE, not equipped to handle the synthesizer models.

Good to know. Guessing they can't get the serial info either lol.