Search found 3291 matches

by Deep Thought
Sun Jun 17, 2018 10:31 pm
Forum: AM Radio
Topic: Wavering field intensity
Replies: 8
Views: 211

Re: Wavering field intensity

RR tracks aren't really a big problem as long as the ground system is designed to accommodate it. I did a six tower inline here in the Chicago area with a spur running between towers 3 and 4. Trains never really upset things much, and this was a critical array (back when such things existed) with hi...
by Deep Thought
Fri Jun 15, 2018 4:13 pm
Forum: AM Radio
Topic: BE AM 1A Power meter not working in FWD
Replies: 11
Views: 325

Re: BE AM 1A Power meter not working in FWD

The forward power meter is at the top with a low/high/off switch. One easy meter test is to set the transmitter at 300 watts (full scale on the low range) and see if the two ranges agree. If there are mechanical issues with the meter it won't go full scale on the low range, but any issues with the r...
by Deep Thought
Wed Jun 13, 2018 12:00 pm
Forum: From the Trenches
Topic: Strange skills learned
Replies: 10
Views: 217

Re: Strange skills learned

Upon leaving the site, I encountered the entire herd standing out by the paved road. The so-called "cattle gate" was just a minor impediment to their freedom. I did a new DA tune/proof outside of Tampa once...about three gates deep into a large cattle grazing operation. The rancher wanted us to kee...
by Deep Thought
Wed Jun 13, 2018 11:51 am
Forum: FM Radio
Topic: FM and windmills
Replies: 6
Views: 198

Re: FM and windmills

How far up is the FM antenna? Wind turbines generally don't rotate fast enough to cause major problems at FM frequencies, and any multipath from them would be unnoticeable once you got a few miles from the site as it would all "look" like a point source to the receiver. I wouldn't be trying to run a...
by Deep Thought
Wed Jun 13, 2018 11:47 am
Forum: AM Radio
Topic: BE AM 1A Power meter not working in FWD
Replies: 11
Views: 325

Re: BE AM 1A Power meter not working in FWD

The meter switches on that series of transmitter are failure points. Check to see if the remote sample is working, and if it is then it's the switch.
by Deep Thought
Mon Jun 11, 2018 5:45 pm
Forum: FM Radio
Topic: Tuning & Loading on Eco 8
Replies: 1
Views: 140

Re: Tuning & Loading on Eco 8

You might try Mike Patton. He usually stock repair parts for these things.
by Deep Thought
Fri Jun 08, 2018 10:37 am
Forum: AM Radio
Topic: Wavering field intensity
Replies: 8
Views: 211

Re: Wavering field intensity

Yeah, if it was after about 4 PM that low of a MP value can be affected by the onset of skywave propagation. I once did an antenna proof in November on a station on 830 KHz in northern California and had to quit taking readings on the backside of the pattern around 3:30 due to WCCO contaminating any...
by Deep Thought
Thu Jun 07, 2018 10:26 pm
Forum: AM Radio
Topic: AM Tuning Unit Design Software
Replies: 9
Views: 312

Re: AM Tuning Unit Design Software

kkiddkkidd wrote:
Thu Jun 07, 2018 7:53 pm
Win7Pro. I have Grant Binghams network design and it refuses to run on "some" installations of Win7 (32 or 64) and any install that I have tried it on Win10.
Interesting. My copy runs in Windows 10 x64 without much whining about it.
by Deep Thought
Tue Jun 05, 2018 7:11 pm
Forum: AM Radio
Topic: AM Tuning Unit Design Software
Replies: 9
Views: 312

Re: AM Tuning Unit Design Software

What version of Windows are you moving from? If they ran in 7 they should run in 10. There are some real old programs that are actually 32 bit but have 16 bit installers which prevent them from being installed on any x64 flavor of Windows. There is a workaround, though. If you've got old DOS stuff, ...
by Deep Thought
Thu May 31, 2018 12:09 pm
Forum: FM Radio
Topic: Harris HT25-FM
Replies: 6
Views: 296

Re: Harris HT25-FM

Check the AM noise...I'll bet it is very high and the IPA power supply has issues especially if the power was going bouncy bouncy during the storm. There is a 36,000 uF/100VDC filter capacitor on the IPA supply (C4) which you might want to take a look at. Are the IPA voltage and current both "normal"?
by Deep Thought
Thu May 31, 2018 8:25 am
Forum: Everything else
Topic: Tomato Soup Incident
Replies: 22
Views: 483

Re: Tomato Soup Incident

deionized, demineralized water As counter-intuitive as it seems to those who have never worked around a water-cooled tube transmitter, pure water is a good insulator. The trick in your laptop story is that there was nothing to leave behind once it dried out. I have to imagine that the cooling fans ...
by Deep Thought
Mon May 28, 2018 11:45 pm
Forum: AM Radio
Topic: Transmitter plant ambient temps?
Replies: 9
Views: 432

Re: Transmitter plant ambient temps?

Solid state equipment lifespan starts getting a lot shorter above 80°F ambient regardless of what the manufacturer says. It may be 20-25° warmer inside the box and those capacitors are gonna bake. For tube rigs I like to see the stack exhaust below 120°F, which usually requires an ambient of around ...
by Deep Thought
Sat May 26, 2018 7:44 pm
Forum: AM Radio
Topic: MDCL or something wrong?
Replies: 5
Views: 211

Re: MDCL or something wrong?

You're not required to run it, and yes it can be turned on and off at the transmitter. I've had to have that done a couple times. It also messes with NRSC mask measurements.
by Deep Thought
Sat May 26, 2018 8:23 am
Forum: AM Radio
Topic: MDCL or something wrong?
Replies: 5
Views: 211

Re: MDCL or something wrong?

That's normal. It makes taking FI readings fun.
by Deep Thought
Wed May 23, 2018 7:19 pm
Forum: Everything else
Topic: Tomato Soup Incident
Replies: 22
Views: 483

Re: Tomato Soup Incident

I suspect the battery voltage sensing circuit is all confused. Can you get at the battery connection? It may just need some cleaning. Your best bet is pure isopropyl alcohol followed with a clean de-mineralized water rinse followed by a few hours in the oven at around 120°F. If you have PC board cle...