Search found 975 matches

by ChuckG
Fri Dec 14, 2018 9:05 pm
Forum: FM Radio
Topic: High Reflected Power Puzzle
Replies: 19
Views: 426

Re: High Reflected Power Puzzle

Typical for that output device would be 180mA idling and 10-12 amps at full output. The VSWR shutdown won't work when the amplifier is oscillating as removing RF drive won't kill the output. I think you're right...that's a 15 year old amplifier and a much older design..... the FET's have probably ch...
by ChuckG
Thu Dec 13, 2018 12:15 am
Forum: FM Radio
Topic: High Reflected Power Puzzle
Replies: 19
Views: 426

Re: High Reflected Power Puzzle

If that's the transmitter I am thinking, it would have two light blue modules in the exciter? This was about 15 years ago.... I wonder how far gone the PSU and caps are in that box if it's that old?
by ChuckG
Sun Dec 02, 2018 11:55 pm
Forum: AM Radio
Topic: AM Radio Wall
Replies: 13
Views: 500

Re: AM Radio Wall

kkiddkkidd wrote:
Sat Dec 01, 2018 9:47 am
I billed 15 hours of regular engineering labor at regular rates with the description of "build floating boat dock" and it was paid without question.
I got questioned on "materials and labor for doghouse repair". How large were these dog houses and when did we get dogs? :lol:
by ChuckG
Sun Dec 02, 2018 11:52 pm
Forum: AM Radio
Topic: AM Radio Wall
Replies: 13
Views: 500

Re: my specialty or theirs.

Chuck: It is very clear to me that the nut doesn't fall far from the tree! Well done my friend, I'm still cracking up!!!!! Got to be one of the best posts yet! :lol: Fossil WAGN, Menominee. You've probably been there lol. They put the tower literally in the back yard of the studio, but don't own an...
by ChuckG
Sat Dec 01, 2018 12:41 am
Forum: AM Radio
Topic: AM Radio Wall
Replies: 13
Views: 500

Re: AM Radio Wall

Had a group of psychologists and counselors build a clinic literally 100 feet from the base of a self-supporter slant fed AM. One day I get a call...they're hearing voices from their electronics. I asked if that was my specialty or theirs.... they weren't amused.
But I was. :lol:
by ChuckG
Mon Nov 19, 2018 10:57 pm
Forum: AM Radio
Topic: KYFR AM tower light monitor
Replies: 16
Views: 671

Re: KYFR AM tower light monitor

Deep Thought wrote:
Sun Nov 18, 2018 11:07 am
They later told me they had been "hearing tower lights" on the air for a few months. Fun times.
When you ask how they monitor the tower lights and they show you the swing in the phase monitor corresponding to the beacons...... :lol:
by ChuckG
Sun Nov 18, 2018 6:50 pm
Forum: AM Radio
Topic: Gates 5 rebuild
Replies: 10
Views: 975

Re: Gates 5 rebuild

Gates BC5H didn't like open delta feeds much either. The powerline would rip the direct-coupled transistors in the audio driver out on a regular basis...all 20+ of them. Took a bucket of MOV's to quiet that mess down.
by ChuckG
Wed Nov 14, 2018 8:52 pm
Forum: AM Radio
Topic: KYFR AM tower light monitor
Replies: 16
Views: 671

Re: KYFR AM tower light monitor

I use the ACM's too. One for each tower on the cold side of the choke. Set the remote reading for total watts with all bulbs lit and a little math will tell you which has failed.
by ChuckG
Tue Nov 06, 2018 9:16 pm
Forum: AM Radio
Topic: RF Ammeter resistance
Replies: 15
Views: 546

Re: RF Ammeter resistance

Could be as simple as having been dropped at some point. It would be interesting to open it up if you haven't and see what there is to see.
by ChuckG
Tue Nov 06, 2018 9:13 pm
Forum: AM Radio
Topic: ATU rebuild
Replies: 21
Views: 739

Re: ATU rebuild

Are you using an adjustable element in the shunt leg? Those old Gates single-coil T-networks with a fixed shunt cap were less than fun to make look good off-carrier.
by ChuckG
Thu Nov 01, 2018 7:26 pm
Forum: AM Radio
Topic: RF Ammeter resistance
Replies: 15
Views: 546

Re: RF Ammeter resistance

The only one I Have on hand is a Weston 0-1A, which measures 1 ohm. I believe higher current meters will measure less..fractions of an ohm. If it's that hot you already have your answer I think.
by ChuckG
Mon Oct 15, 2018 10:32 pm
Forum: AM Radio
Topic: Gates 5 rebuild
Replies: 10
Views: 975

Re: Gates 5 rebuild

Gates does stock the capacitor kits and the price is fairly reasonable. I've done several of these. I've read of folks getting caps from places like Mouser, but if you do- as Fossil said, watch the terminal spacing and physical size. There is no room for variance. If the fuses are blown you can bet ...
by ChuckG
Mon Oct 01, 2018 7:09 pm
Forum: FM Radio
Topic: Avarage life of a 3cx15000a7
Replies: 6
Views: 552

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: 220

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: 220

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...