Search found 120 matches

by rich wood
Mon Jul 27, 2020 1:44 pm
Forum: TV Engineering
Topic: IOT Tubes
Replies: 0
Views: 178

IOT Tubes

Howdy,
I am working a a station has 3 IOT tubes from a Comark Transmitter that need to be recycled/disposed. Can some one let me know what is a good path for these tubes??
Tks
by rich wood
Wed May 20, 2020 4:17 pm
Forum: AM Radio
Topic: CSP phasor controller
Replies: 9
Views: 922

Re: CSP phasor controller

Did you verify the underground cable integrity?
Kurt Gorman at Phase Tek, may be able to help with understanding the switcher.
https://www.phasetekinc.com/
by rich wood
Wed Feb 12, 2020 4:11 am
Forum: TV Engineering
Topic: TV Transmitter question
Replies: 1
Views: 550

TV Transmitter question

I was in ND this week helping fix an E L Marsden 3 kW UHF transmitter. Never heard of or seen one of these before. Anyone have a clue on possible parts? The outfit is out of business.
TKS.
by rich wood
Thu Jan 09, 2020 2:38 am
Forum: Broadcast Engineering News
Topic: The Looming Engineering Age Crisis
Replies: 74
Views: 10896

Re: The Looming Engineering Age Crisis

When the owners have to get into the pit and change the tires, then some thing will change. Some are getting more involved, most are not. Yes, we have been sounding the alarm, but the tree has fallen in the woods, and no one heard it. All I can see and say, YOUR UP,, we are retiring and NO I do not ...
by rich wood
Mon Nov 11, 2019 3:40 pm
Forum: TV Engineering
Topic: Tower Elevators
Replies: 1
Views: 516

Tower Elevators

Hello,
I have been contacted by a station in WI looking for help with a Marshall Elevator controller. Does anyone have resources in this area?
Tks.
by rich wood
Mon Sep 09, 2019 11:36 am
Forum: FM Radio
Topic: FM Antenna Tuning
Replies: 11
Views: 978

Re: FM Antenna Tuning

If the sample for the reflected is at RF level, Not DC, you could put a 1/4 wave stub on a T connector in line to shunt out the offending signal. FM antennas are very broad in nature and they receive as well as transmit. The tuning section is actually a line matcher that fools the transmitter and do...
by rich wood
Wed Aug 21, 2019 9:07 pm
Forum: AM Radio
Topic: finding AM ground radials
Replies: 41
Views: 5595

Re: finding AM ground radials

Go for the direct approach,, Rent a ditch witch and run a trench 90 degrees to the radials. They cut off pretty quickly and then can be repaired. Start 100' out and the have an ohm meter and a long known good piece of wire to check continuity back to the base. If you do this at 4 areas 90 degrees ap...
by rich wood
Wed Jul 31, 2019 9:20 am
Forum: FM Radio
Topic: Omni FM with Parasitics?
Replies: 9
Views: 742

Re: Omni FM with Parasitics?

Antenna manufacturer's used to "optimize" antennas for a minimizing of tower interaction with the pattern. Then some went overboard and the the FCC decided they were making directional antennas. The parasites you have are for the horizontal component only. In the basic sense they would pull in the b...
by rich wood
Wed Jul 24, 2019 9:12 am
Forum: TV Engineering
Topic: HP HPM-441A Calibration
Replies: 1
Views: 189

Re: HP HPM-441A Calibration

I believe Precision Comm has had good luck with this group for HP Analyzer cals,, you will have to check on their services for a power meter
https://www.topdogtest.com/we-buy-used- ... -equipment
by rich wood
Mon Jul 22, 2019 11:02 am
Forum: TV Engineering
Topic: Blue Bird Load caution
Replies: 1
Views: 301

Re: Blue Bird Load caution

OK,,, thanks.
by rich wood
Mon Jul 22, 2019 11:00 am
Forum: Ask the Engineers
Topic: Dielectric Dehydrator
Replies: 1
Views: 343

Re: Dielectric Dehydrator

Well, the answer came back from the factory: The unit is acting normally,, very short cycles are not typical for transmission line use of the unit. The line acts as a reserve tank for the pressure and should only need to be "topped off" once in while. OK,,, then.
by rich wood
Sat Jul 20, 2019 1:41 pm
Forum: Ask the Engineers
Topic: Dielectric Dehydrator
Replies: 1
Views: 343

Dielectric Dehydrator

Howdy, I have a new 1000TLS Compressor Dehydrator from Dielectric. It runs fine, makes pressure as specified, but when it short cycles the motor grunts during the third or fourth round and it trips the on/off switch. Any thoughts.
Thanks
by rich wood
Sat May 18, 2019 9:18 pm
Forum: TV Engineering
Topic: VHF Low Band OTA antennas
Replies: 3
Views: 730

Re: VHF Low Band OTA antennas

These folks make some nice made in USA antennas,, UHF and VHF types:
https://store.antennasdirect.com/HD-TV-antennas.html
by rich wood
Fri Feb 22, 2019 1:39 pm
Forum: FM Radio
Topic: HD Radio Install
Replies: 1
Views: 430

HD Radio Install

Howdy, I installed a new Nautel GV 15 HD transmitter last week. Before pulling the existing rig, I checked the parameters and reflected power was 4 watts with 10 kW forward,, After installing the new rig and doing preliminary setup I fired it into the antenna,, WOW 35 watts reflected!! After taking ...
by rich wood
Wed Sep 12, 2018 8:54 am
Forum: TV Engineering
Topic: High Intesity Tower Lights
Replies: 3
Views: 678

High Intesity Tower Lights

Howdy,
Does anyone have experience with the Dialight High Intensity LED lights called Vigilant? What is the word on this equipment??
I am hoping to move away from the typical high maintenance strobe systems.
Thanks