Search found 963 matches

by ChuckG
Mon Oct 01, 2018 7:09 pm
Forum: FM Radio
Topic: Avarage life of a 3cx15000a7
Replies: 6
Views: 365

Re: Avarage life of a 3cx15000a7

What transmitter is it in and what power level? Armstrong used that tube in some of their 10kW's and it would last forever. It barely loafed.
In the older CCA's running nameplate power, maybe 2 years.
by ChuckG
Sun Sep 30, 2018 8:30 pm
Forum: Ask the Engineers
Topic: IPAWS Server bouncing?
Replies: 7
Views: 183

Re: IPAWS Server bouncing?

Guess I’ll have to fire up the 95 machine sitting out in the garage and investigate. I had a suspicion he was right but it was too much fun to argue with him! Open up MSDOS.SYS in a text editor. It's just a text file in 95/98. Change: BootGUI=1 to BootGUI=0 Add a line: LOGO=0 Reboot and presto, DOS 7
by ChuckG
Sat Sep 29, 2018 11:55 pm
Forum: Ask the Engineers
Topic: IPAWS Server bouncing?
Replies: 7
Views: 183

Re: IPAWS Server bouncing?

Actually...he was entirely correct. WIn 95 is just a pretty front end for DOS 7 (and 7.1 for '98). The DOS OS can be extracted from underneath Win 9X with a simple edit to MSDOS. SYS and run as a stand alone OS. WIndows just adds a GUI on top. . A fellow I used to work for would, when sufficiently l...
by ChuckG
Tue Sep 25, 2018 9:28 pm
Forum: Ask the Engineers
Topic: Dead Relio Revived
Replies: 13
Views: 421

Re: Dead Relio Revived

Nice work. I wonder what type of solder they used that was that difficult to remove?
by ChuckG
Wed Sep 12, 2018 10:04 pm
Forum: FM Radio
Topic: TX + Bad Memory = Off Air
Replies: 10
Views: 720

Re: TX + Bad Memory = Off Air

Shane wrote:
Wed Sep 12, 2018 11:40 am
Anyway, since they’re a non-profit, transmitter downtime often equals increased donations.
I'll second that. First time I took a local NP off-air for repairs during the afternoon, the phones lit up and the checkbooks came flying out.
by ChuckG
Wed Sep 12, 2018 9:59 pm
Forum: AM Radio
Topic: Crystal alternative
Replies: 17
Views: 929

Re: Crystal alternative

I used a Delta RG1 to replace a failed crystal oscillator in a BC1T until a replacement could be found. Worked surprisingly well.

Anyone making retrofits for other xtal controlled equipment, like Marti STL gear? Or are those dead in the water when the need arises?
by ChuckG
Mon Aug 27, 2018 10:25 pm
Forum: Ask the Engineers
Topic: Tantalum caps
Replies: 9
Views: 297

Tantalum caps

Had to replace a couple shorted tantalum caps after lightning damage yesterday. All I had on hand were equivalent value aluminum electrolytics which appear to be working just fine. These were 10uF tantalums on the output side of a linear power supply voltage regulator. Any reason I need to go back a...
by ChuckG
Mon Aug 27, 2018 10:17 pm
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

Re: The-1 or FX-30

24 hour talk format, the difference isn't worth the expense. Either exciter is better than the ESPN audio fed to it. For a music format, yet. After having used both exciters over the years and as compared with modern exciters? I wouldn't put either on the air. They both have problems that can effect...
by ChuckG
Sun Aug 26, 2018 12:10 am
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

Re: The-1 or FX-30

Deep Thought wrote:
Sat Aug 25, 2018 9:45 pm
I believe those first appeared in 1989.
It was around there somewhere. I bought one in '90 to replace an aging 1970's CCA 60 watt exciter and it was a new product at the time. The difference in sound between it and the CCA was tremendous.
by ChuckG
Sat Aug 25, 2018 9:19 pm
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

Re: The-1 or FX-30

Shane wrote:
Sat Aug 25, 2018 8:48 pm
What vintage is that, seeing it appears to have a non-switching PS?
It was installed new in 1991 or 1992
by ChuckG
Sat Aug 25, 2018 12:48 am
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

Re: The-1 or FX-30

Decided to overhaul both and put the BE in service. Harris will go on the shelf for a working spare. Transmitter only needs 7 watts drive, so either will power it just fine. Almost finished rebuilding the Harris as I had those parts on order first, took an ultrasonic bath to get all the mouse crud o...
by ChuckG
Sat Aug 25, 2018 12:45 am
Forum: FM Radio
Topic: Wanted: Multimeter for Harris Exciter
Replies: 1
Views: 186

Re: Wanted: Multimeter for Harris Exciter

For others that might need it, Harris no longer stocks this meter, but their supplier does. It is a Modutec, P/N 2S-DUA-100 100uA Allied electronics stocks them for $78.00 https://www.alliedelec.com/modutec-jewell-instruments-2s-dua-100-u/70009731/ You will have to swap meter scales ( pop the covers...
by ChuckG
Sat Aug 18, 2018 9:15 pm
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

Re: The-1 or FX-30

The PA output device is obsolete for both of them, but I did find a NTE substitute (NTE360)
for the BE. Can't find any sub for the Harris. I think that'll make the decision right there.
by ChuckG
Sat Aug 18, 2018 1:50 am
Forum: FM Radio
Topic: The-1 or FX-30
Replies: 17
Views: 586

The-1 or FX-30

Station's Harris The-1 exciter started the random AFC unlock dance. Swapped in a borrowed exciter (problem stopped) and brought the Harris back to the shop. Most of the capacitors measure "shot", multimeter is frozen, generally filthy condition inside. So it looks like a complete scrub and rebuild i...