Search found 26 matches

by fm-engineer
Mon Aug 26, 2019 4:43 pm
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 456

Re: FM Antenna Tuning

Echo DaveSt, contact ERI first. They may have some info on it. ERI tunes antennas off center for icing, but that seems a little high. However, looking at reflected power / VSWR is just a quick snap shot, and doesn't tell the whole story. Many older ERI's around here are running at 1.25 VSWR, but if ...
by fm-engineer
Sun Jul 21, 2019 8:30 am
Forum: FM Radio
Topic: National brand tubes
Replies: 13
Views: 514

Re: National brand tubes

I have a Harris HT5 that is just finishing up it's sixth year on an Econco rebuild and starting to weaken. Looking around for replacements, there is no rebuild stock of these tubes any longer to purchase. Wow, five years. That's impressive for that tube and transmitter. Unheard of in these parts. I...
by fm-engineer
Wed Nov 21, 2018 3:15 pm
Forum: FCC Discussion
Topic: possible ownership cap rule changes
Replies: 10
Views: 2173

Re: possible ownership cap rule changes

It looks like this issue is once again up on the Dec 12 agenda. I am hearing from some reliable sources the NAB's proposal to completely deregulate radio ownership 75+ is going to pass. There may be a public comment period, but Pai and O'reilly seem to be indicating privately its a done deal.
by fm-engineer
Sun Aug 26, 2018 7:24 pm
Forum: Digital Radio
Topic: Nautel Extended Digital Mode
Replies: 5
Views: 1055

Re: Nautel Extended Digital Mode

Interesting, I've had my fair share of issues with a GV. Put a new GV10 on about two months ago. The main HD exciter would not make any RF right out of the crate, and that was just the start of issues. Backup non-HD exciter ran for a week or so until a new HD exciter arrived. Turned on HD service, a...
by fm-engineer
Fri Jul 13, 2018 11:09 am
Forum: FCC Discussion
Topic: possible ownership cap rule changes
Replies: 10
Views: 2173

possible ownership cap rule changes

What is everyone hearing on NAB's recommendation for complete radio ownership deregulation on markets 75+? Does anyone think this will pass the FCC this year or maybe next year?
by fm-engineer
Thu May 31, 2018 6:51 pm
Forum: FM Radio
Topic: Harris HT25-FM
Replies: 6
Views: 519

Re: Harris HT25-FM

What is the stereo generator? 8000 and 8100 Optimod used to develop a whine or whistle, but I can't exactly remember why. Otherwise, I agree with the others. Check the cables. Change the soup can caps. You may want to open up the IPA and look at the combining circuit. Check the IPA current and see i...
by fm-engineer
Wed Apr 04, 2018 11:18 am
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 24
Views: 1746

Re: National over Eimac or Econco

My Nautel 10NV/lt doesn't need any kind of light bulb! :D TPT, how do you like that NV10? I'm getting ready to install a Nautel GV10 in the coming weeks. What size primary conductors did you use on the 10? I just applied for an electrical permit and the inspector wants us to use 4 gauge primary con...
by fm-engineer
Tue Apr 03, 2018 5:39 pm
Forum: FM Radio
Topic: National over Eimac or Econco
Replies: 24
Views: 1746

Re: National over Eimac or Econco

Four years on a 4cx3500 is pretty amazing. Most life I've gotten out of a typical Eimac 4CX3500 is about two years at full power, 12-16 months from an Econco. I believe ProTek is the former Richardson Electronics. At one time I was taking care of five Harris transmitters that used that tube, but all...
by fm-engineer
Fri Mar 16, 2018 10:36 am
Forum: FM Radio
Topic: HT-5 plate off problem
Replies: 10
Views: 575

Re: HT-5 plate off problem

Correct,

All analog metering and I think there's just one board on HT5. I appreciate everyone's input.
by fm-engineer
Wed Mar 14, 2018 8:54 pm
Forum: FM Radio
Topic: HT-5 plate off problem
Replies: 10
Views: 575

Re: HT-5 plate off problem

True words there. Did that first thing. Its not the panel button, but I didn't have time to dig into the remote control interface board. I do think the local switch bypasses the remote command strip, and the problem exists in local also. Headed back there in a few days to examine the schematics in d...
by fm-engineer
Wed Mar 14, 2018 8:14 pm
Forum: FM Radio
Topic: HT-5 plate off problem
Replies: 10
Views: 575

HT-5 plate off problem

Here's an odd one for the braintrust: Have an HT-5 that likes to stay on, and I mean on. The plate off button results in a clunking /shuttering plate contactor, where its trying to stay on. HV and current jumps up and down with the clunking. Remote or local commands make no difference. Anyone ever e...
by fm-engineer
Mon Mar 12, 2018 10:55 am
Forum: AM Radio
Topic: ground strap thickness
Replies: 10
Views: 879

Re: ground strap thickness

Yep, I had an electrical inspector recently require us to cut loose the connection between the transmitter reference ground and the service entrance panel ground. He said the service entrance can only be attached to a designated ground rod and nothing else. When he saw the 4 inch strap inside the bu...
by fm-engineer
Sun Mar 11, 2018 9:37 am
Forum: AM Radio
Topic: ground strap thickness
Replies: 10
Views: 879

Re: ground strap thickness

Thanks for the info
by fm-engineer
Wed Mar 07, 2018 6:47 pm
Forum: AM Radio
Topic: ground strap thickness
Replies: 10
Views: 879

ground strap thickness

Is 0.022 still industry standard on 4" inch ground straps? I'm getting ready to rebuild an indoor ground system and it appears there are now four different thicknesses of copper strap available from most suppliers. The thick or heavy duty one is 0.032. Me thinks 0.022 is what most of us have used fo...
by fm-engineer
Sun Jan 28, 2018 6:39 pm
Forum: FM Radio
Topic: Connector suppliers....
Replies: 14
Views: 904

Re: Connector suppliers....

I believe ERI owns Andrew, and the coax used by the cell industry is somewhat thinner.