Search found 919 matches

by ChuckG
Tue Apr 10, 2018 7:17 pm
Forum: FM Radio
Topic: FM3.5 odd problem
Replies: 9
Views: 313

Re: FM3.5 odd problem

The FM3.5 uses a solid state relay in the primary of the plate xfmr. Nice work finding that. Would never have guessed to look there. Harris had a field upgrade for that, adding a magnetic contactor. The contactor went in the plate primary circuit,the SSR then got rewired to operate just the contact...
by ChuckG
Mon Apr 09, 2018 7:58 pm
Forum: FM Radio
Topic: FM3.5 odd problem
Replies: 9
Views: 313

Re: FM3.5 odd problem

It's quicker to lift them all up off ground at once and put a small fuse between transformer/choke chassis and ground. The blown fuse will tell you which iron has the problem.
by ChuckG
Sun Apr 08, 2018 6:20 pm
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 20
Views: 612

Re: National over Eimac or Econco

Installed a Harris HT-5 waaay back in the early 90's. First factory new tube lasted well over 38,000 hours. Second tube - a rebuilt - lasted a year, third lasted back up in over 25,000 hours. Recent years, life has been pretty good with rebuilts. The rebuild in our HT-5 has chugged along for 39,420...
by ChuckG
Fri Apr 06, 2018 7:49 pm
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 20
Views: 612

Re: National over Eimac or Econco

RGORJANCE wrote:
Fri Apr 06, 2018 6:45 am
How long did your's last???

Fossil
I put one in a Collins 2kW FM and hit the plates, lights went out, destroyed the socket.
by ChuckG
Fri Apr 06, 2018 7:45 pm
Forum: AM Radio
Topic: GATES ONE IRF-350 REPLACEMENT
Replies: 9
Views: 490

Re: GATES ONE IRF-350 REPLACEMENT

Chuck: The old metal TO-3 case version is what Jon is working on for the mod to the TO-3P. Good. Those have gotten expensive and it's only going to get worse. One particular SX I worked on had intermittent RF and some bizarre faults.. I found someone had replaced the FET's by prying them off the bo...
by ChuckG
Thu Apr 05, 2018 10:39 pm
Forum: Ask the Engineers
Topic: Sage ENDEC Printing
Replies: 7
Views: 175

Re: Sage ENDEC Printing

Is there a requirement to actually print and store the EAS logs on paper?
I keep the Sage emails in weekly folders and keep a separate single-sheet "station log" to sign off on EAS, Tower lights, etc, but don't attach the sage alerts to that log. They are archived in the "EAS" email account.
by ChuckG
Thu Apr 05, 2018 10:30 pm
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 20
Views: 612

Re: National over Eimac or Econco

RGORJANCE wrote:
Thu Apr 05, 2018 8:49 am
Nearly as crazy as the old 5CX1500 war story.
If you are talking about the Salt Lake nickel plated tubes, I still have nightmares.
by ChuckG
Thu Apr 05, 2018 10:03 pm
Forum: AM Radio
Topic: GATES ONE IRF-350 REPLACEMENT
Replies: 9
Views: 490

Re: GATES ONE IRF-350 REPLACEMENT

SX and Early Gates AM's used the IRF-350. That's the TO-3 style metal case FET. Infineon still makes them at $18 a pop, the NTE equivalent (NTE2993) is $30. That's the problem. They are $$$ Like this: https://www.radiomuseum.org/images/tubephoto_klein/irf350.jpg Later Gates AM's used the plastic cas...
by ChuckG
Tue Apr 03, 2018 9:58 pm
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 20
Views: 612

Re: National over Eimac or Econco

As I understand it the new Econco tubes are the same as the rebuilds internally, using new ceramics and metals. Pro-Tek is a Chinese tube, D&C used to do some final testing on them and they were generally good. I had very good luck with them in a Gates FM10K....or did, RIchardson owns them now too s...
by ChuckG
Sat Mar 17, 2018 1:35 am
Forum: AM Radio
Topic: GatesAir suspends AM TX sales (Radio World)
Replies: 25
Views: 768

Re: GatesAir suspends AM TX sales (Radio World)

Well, when our DAX3 dies and repair parts are no longer available, this seems to be where we are ultimately headed, then what? This is going to put a lot of smaller struggling broadcasters in a bind. We are merely engineers. We don't walk on water, nor resurrect the dead. I just had a pair of BW Br...
by ChuckG
Sat Mar 17, 2018 1:21 am
Forum: FM Radio
Topic: HT-5 plate off problem
Replies: 10
Views: 321

Re: HT-5 plate off problem

The controller board sends a +V signal to a solid state relay, which in turn operates the plate contactor. I've had those solid state relays fail in all sorts of ways, most resulting in the plates not staying off. Remove the input signal to the SSR, if the plates stay off then it's the controller. I...
by ChuckG
Sun Jan 28, 2018 12:04 am
Forum: Radio Automation Systems
Topic: Arrakis Automation
Replies: 6
Views: 367

Re: Arrakis Automation

The Arrakis console issues, and we still have 5 of them in service, is almost always that VCA chip. Even with good grounding they fail. An online UPS stopped the failures, at least so far. I know of two DigiLink DL4 systems still on-air and chugging along. I had to repair the switcher on one, the ot...
by ChuckG
Thu Dec 21, 2017 9:44 pm
Forum: Radio Studio Engineering
Topic: Broadcast Electronics Console Model 5S150 Issues
Replies: 21
Views: 879

Re: Broadcast Electronics Console Model 5S150 Issues

We had serial #1 Collins 212G at WFHR, the on-air studio had a Gates Dualux II that had no serial number at all, purchased as a pre-production show unit. I'd love to know where it went. Ran into another 212G at WJMS, it was still in service in the main studio when I left in 2006. One of the few thin...
by ChuckG
Tue Nov 21, 2017 7:24 pm
Forum: Everything else
Topic: IPAWS outage?
Replies: 5
Views: 273

Re: IPAWS outage?

We've been having intermittent connection problems to IPAWS up here in Central Wisconsin for 3 days. Saturday was the worst. More than one station, different cities and different ISP's.
by ChuckG
Fri Nov 10, 2017 7:08 pm
Forum: Ask the Engineers
Topic: Factory Reset XDS PRO1P
Replies: 5
Views: 379

Re: Factory Reset XDS PRO1P

I am guessing Scott's receiver is one that doesn't have the front panel display, which means there is no access to a daily password for logging into the embedded web page or anything else. Loads of fun when it wont' grab a DHCP address. Have to use a serial cable and a few words not suited for on-a...