Search found 3199 matches

by Deep Thought
Mon Dec 18, 2017 12:17 am
Forum: FM Radio
Topic: Singling out 2 stations on same frequency
Replies: 10
Views: 492

Re: Singling out 2 stations on same frequency

With the commercial Rules there's very specific distance separation requirements between the various class(es) of stations. Those distance separations are a joke and everyone knows it. They don't come close to actually providing the protection they claim to provide, but since the rules explicitly s...
by Deep Thought
Mon Dec 18, 2017 12:07 am
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 9
Views: 131

Re: RF Spectrum Analyzer

"High featured, low cost ones like the Rigol look pretty but fall short when you need to actually makes serious measurements"

You evidently haven't used one.
by Deep Thought
Sun Dec 17, 2017 12:15 pm
Forum: FM Radio
Topic: RF Spectrum Analyzer
Replies: 9
Views: 131

Re: RF Spectrum Analyzer

Check out the Rigol units. I have this one and for US$1300 it does everything one that cost ten times that did from 20 years ago: https://www.rigolna.com/products/spectrum-analyzers/dsa800/dsa815-tg/ . The only real downside is the phase noise isn't as good as on the "lab grade" units, but then agai...
by Deep Thought
Sun Dec 10, 2017 9:32 pm
Forum: FM Radio
Topic: Harris/Gates support
Replies: 5
Views: 188

Re: Harris/Gates support

How far the mighty have fallen. I got into a little argument with them a couple NABs ago about this very thing. Voicemail is not "24/7 Support". Their response was that their equipment didn't NEED to have someone available 24/7. I decided right then based on that and some previous encounters involvi...
by Deep Thought
Sun Dec 10, 2017 1:41 pm
Forum: FM Radio
Topic: Harris/Gates support
Replies: 5
Views: 188

Re: Harris/Gates support

If (888) 840-4622 didn't get you to someone then their "24/7 support" isn't.

You can also try support@gatesair.com.
by Deep Thought
Sun Dec 10, 2017 12:19 pm
Forum: FM Radio
Topic: BE FM 25T Wandering Readings
Replies: 4
Views: 217

Re: BE FM 25T Wandering Readings

And once you've done what Fossil suggests, you might consider installing a simple two resistor voltage divider on the sample with a capacitor from the midpoint to ground where it feeds to the Burk. It is much better to have a higher voltage sent to the r/c and then lower it there than to lower the s...
by Deep Thought
Sat Dec 09, 2017 10:59 pm
Forum: From the Trenches
Topic: The high leg
Replies: 13
Views: 2420

Re: The high leg

I once had someone tell me that "there is plenty of room for more breakers in the panel...a third of the slots have blanks over them" when I asked where we could add a 120VAC circuit for an equipment rack.

Uh, no. :roll:
by Deep Thought
Sat Dec 02, 2017 12:36 pm
Forum: AM Radio
Topic: Low Power AM ATU question....
Replies: 4
Views: 355

Re: Low Power AM ATU question....

"base loaded 7m vertical" As noted above, unless this antenna is tuned very close to resonance you'll never get it to work right. Even if you manage a "match" without doing that using an ATU any environmental change will cause issues. I've fought this battle with TIS antennas here in the USA and it ...
by Deep Thought
Mon Nov 27, 2017 11:03 am
Forum: Ask the Engineers
Topic: AM site and Solar arrays
Replies: 7
Views: 376

Re: AM site and Solar arrays

The solar farm shouldn't cause you much disturbance if it is installed properly, but the installers will learn a few things about RF, antennas and why you wear thick leather gloves working around long bits of metal near an AM array. :mrgreen:
by Deep Thought
Wed Nov 22, 2017 7:53 pm
Forum: FM Radio
Topic: Singling out 2 stations on same frequency
Replies: 10
Views: 492

Re: Singling out 2 stations on same frequency

You can do it but it will require a rather large directional receive antenna mounted on the roof, which won't do much for your car's aerodynamics.
by Deep Thought
Wed Nov 22, 2017 1:42 pm
Forum: FCC Discussion
Topic: Pirates captured
Replies: 12
Views: 792

Re: Pirates captured

Does anyone care to guess how much power it would take with a 2-bay w/ 7/8in line at about 100m to give an 8(ish) mile 60dBu omni contour? Eff See See propagation tool sez 260 watts ERP at 100 meters gives a 60 dBu at about 13 KM (8.1 miles). Two bay full spaced antenna would need somewhere in the ...
by Deep Thought
Tue Nov 21, 2017 9:56 am
Forum: Everything else
Topic: KYFR radio
Replies: 5
Views: 294

Re: KYFR radio

I think Bob Jones did the original setup on that and I may have old tuning notes, etc. in the office basement. If so you can have the file. I should be at the office in about an hour (it's about 10 AM CST now). added: It appears that Bob took all of the Family Stations files with him when he "retire...
by Deep Thought
Mon Nov 13, 2017 5:40 pm
Forum: Ask the Engineers
Topic: FAA requirements for Decommissioned towers
Replies: 5
Views: 294

Re: FAA requirements for Decommissioned towers

Yeah, some asshole inspector wanting to make trouble for someone will nick you for not notifying the FCC about a dismantled tower (or one registered but not constructed). Definitely go into the ASRN system and change the status to "horizontal". :) As for the FAA, you file a 7460-2 Supplemental Notic...
by Deep Thought
Mon Nov 13, 2017 5:30 pm
Forum: STL Engineering
Topic: Aligned our STL this morning. Opinions?
Replies: 8
Views: 392

Re: Aligned our STL this morning. Opinions?

26 dBu (19 uV) is pretty miserable. You've got something horribly wrong unless this is a 20 mile hop, and even then the received signal levels should be at least an order of magnitude better.
by Deep Thought
Mon Nov 13, 2017 5:27 pm
Forum: FM Radio
Topic: FM range question - coastal mountainous terrain
Replies: 23
Views: 902

Re: FM range question - coastal mountainous terrain

Could you be so kind as to do that again for say 4kW in the same location, for 4 antenna bays instead of two, and for both those combined 4Kw + 4 bays? Mr. Fry will probably answer you directly, but as a practical matter the number of bays is irrelevant, and the increase from 1 to 4 KW will just do...