Search found 39 matches

by radio_guru
Mon Mar 12, 2018 6:25 pm
Forum: FM Radio
Topic: High intensity strobe light repair
Replies: 3
Views: 358

Re: High intensity strobe light repair

It really depends on the manufacturer. I have the old EG&G system now supported by Hughey and Phillips. It's getting pretty costly to keep them going. But H&P still supports them for the most part and they're not too bad to work on. 95% of the problems are in the high voltage areas. Failed relays, d...
by radio_guru
Mon Mar 12, 2018 6:15 pm
Forum: AM Radio
Topic: ground strap thickness
Replies: 10
Views: 532

Re: ground strap thickness

Your best bet is to connect the service panel to a well beyond NEC minimum enhanced earthing system ring which is also the RF and tower ground. In Chicago, that's called a Hogan Ground where the panel is bonded to a much larger ground system covering multiple devices and services as well as structur...
by radio_guru
Wed Feb 14, 2018 2:17 pm
Forum: AM Radio
Topic: Audio Bandwidth of an AM Broadcast Station
Replies: 19
Views: 1287

Re: Audio Bandwidth of an AM Broadcast Station

Never mind that with a FM translator, station owners have no motivating reason to care about their AM audio quality. It can sound like it's coming on a string and tin cans. Doesn't matter a hill of beans as long as the thing is on the air at licensed power and pattern. I will say I have started usin...
by radio_guru
Sat Feb 03, 2018 10:44 am
Forum: FCC Discussion
Topic: FAA/FCC Regs
Replies: 3
Views: 440

Re: FAA/FCC Regs

The rules are for ***all*** structures above 50ft. which are smaller than 10 outside diameter/profile, outside of municipal boundaries, and not adjacent to any buildings. IOW, locations where crop dusters and other low flying aircraft will operate. My birds are tweeting there is a revision in the st...
by radio_guru
Sat Feb 03, 2018 9:33 am
Forum: FM Radio
Topic: Harris/Gates support
Replies: 23
Views: 1618

Re: Harris/Gates support

Is there a possibility the PS schematic is available...in the manual. For $2300, I would certainly look into field repair. Likely a bad cap or something easy to swap out. You can buy a lot parts for $2300 and bring back to life a spare. The above not withstanding, there are a lot of unitary PS's out...
by radio_guru
Sat Feb 03, 2018 9:19 am
Forum: AM Radio
Topic: 317c1 parts
Replies: 11
Views: 699

Re: 317c1 parts

I have a NX25 in a well insulated lower midwest building and I do need to supplementally heat the building. I find it funny the ND10 back-up TX emits more heat than the NX25. That siad, I can cool outside 95 deg. drybulb temp with an 80 deg. wet bulb (dew point) by only a single 3 tonne air conditio...
by radio_guru
Thu Jan 18, 2018 7:28 pm
Forum: FM Radio
Topic: Harris/Gates support
Replies: 23
Views: 1618

Re: Harris/Gates support

Problem with CEC is they no longer have any 24/7 support at all. It's 9-5, leaving out noon-1 for lunch. The guys there are still top notch. But the reality is they're out of making new FM and AM broadcast TX's and are there just to support what's out there (besides building big shortwave TX's). Som...
by radio_guru
Sun Jan 07, 2018 9:13 pm
Forum: Ask the Engineers
Topic: Convert to LEDs, or leave 110v?
Replies: 10
Views: 790

Re: Convert to LEDs, or leave 110v?

I did just that with some RCA replica fixtures. I procured 1M long strips of NFLS-R300-X3 series red LEDS from superbrightleds.com Super bright emission. Blindly bright In my fixtures, I went one step farther. I also installed strips of amber and "wig-wag"d the amber and red using a flasher from: ht...
by radio_guru
Fri Jan 05, 2018 8:40 pm
Forum: FM Radio
Topic: Tower Painting question
Replies: 13
Views: 664

Re: Tower Painting question

In the past, I have used a moisture cure urethane paint from a company named Wasser High Tech Coatings. I get 10 years solid out of the orange before it softly fades to a greyish pink. The model is MC-Luster Shield Coat 100 --GLOSS... Gloss paint is per AC-7460-L., Section 12. As are the paint tint ...
by radio_guru
Tue Jan 02, 2018 11:22 am
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 26
Views: 1423

Re: RF Spectrum Analyzer

If you have access to $3400K US, the following unit (Anritsu MS2721B) will do the job with the proper accessory external notch filters. It's essentially an updated portable version of the HP8594E with tracking generator and a few added features. I now own both model devices. The seller will accept $...
by radio_guru
Mon Jul 17, 2017 1:15 pm
Forum: FM Radio
Topic: Static Dissipators?
Replies: 13
Views: 1668

Re: Static Dissipators?

I'll second the ERI lightning spurs. Put them on all my towers so far and the hits have been fewer and farther between. And at the same time beefed up the earthing system so the resistance would be lowest as well. And like others have opined, lightning will go where it wants and how. So if the spurs...
by radio_guru
Mon Jul 17, 2017 9:34 am
Forum: Radio Studio Engineering
Topic: SIP lISTEN LINE
Replies: 0
Views: 559

SIP lISTEN LINE

To the Braintrust, Have a client who employs a good VoIP Asterisk/FreePBX system and Polycom phones who wants to add listen lines for their stations OTA and outbound network feeds. They have standard telco TDM-PRI type service and converts to SIP in-house. So the quality of the service is not degrad...
by radio_guru
Tue Jun 27, 2017 5:29 pm
Forum: Ask the Engineers
Topic: Offical AMC 8 Transition Thread (was Sat. AMC-8)
Replies: 153
Views: 15315

Re: Offical AMC 8 Transition Thread (was Sat. AMC-8)

Anyone installed the new MAX receiver from Orbital Media (old CCS) to replace the SGIII as part of the AMC18 conversion?

What are your thoughts on the difference in audio quality between the two systems?

RG
by radio_guru
Tue Jun 27, 2017 5:25 pm
Forum: Radio Studio Engineering
Topic: EAS Issue
Replies: 13
Views: 1599

Re: EAS Issue

In our group, the EAS is after all switching regardless of whether we're operating in AoIP or conventional. Insertion is after the delay, all pre-processing, emergency bypass switches, everything. We use a pair of TFT 940 multi-station insertion units for feeding four stations just before each stati...
by radio_guru
Fri Feb 26, 2016 1:39 pm
Forum: FCC Discussion
Topic: ASR for towers holding unlicensed WISP equipment
Replies: 11
Views: 1532

Re: ASR for towers holding unlicensed WISP equipment

Not any more. The revised Part 17 rules released last year places all responsibility on the structure owner. Also, it doesn't matter whether the radio systems on the structure are licensed or Part 15. It is urban legend Part 15 is exempt. It is not. The radio systems are authorized under any Part, a...