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  #41 (permalink)  
Old 05-18-2017, 6:49 PM
Coyote-Frostbyte's Avatar
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A Coyote 2200 update.
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The tower is up--- all 45 feet of it, sans the top loading coil. The transmitter is set and the borrowed amplifier - connected. The matching circuit is a simplicity of design... a huge coil with a very large variable capacitor... most likely to be replaced with something better.
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I took it briefly out of the 2200 ham band to a nearby NTIA frequency I can access and ran a brief test-- 2150 watts into the antenna, a narrow band frequency shift test signal..
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And.....
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Bingo! .............. RST 569 at ~250 miles.
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Now it can all sit until the day 2200 is officially released. That will give me time to work on that top hat loading coil. Besides, we've a Spring blizzard blowing up on the mountain, and it will be awhile before I'm back in Colorado..... it can sit--
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On another note: in talking about my "Folly" with a colleague, he reminded me that frequencies below 9Khz are not regulated. Yes, I know- that is Really Low-- but-- experiments are being run there all the time and surprising thing occur.... plus, there are no rules...
I throw that out for what its worth-- plus don't discount the 160-190Khz allocation under Part 15--
The VLF and VeryVeryVLF's are a blossoming experimenter's playground.
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So-- awaiting Spring to finally settle in... and the FCC to act..................
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.................................CF
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  #42 (permalink)  
Old 05-19-2017, 3:53 PM
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...and I thought you were going to let this sleeping dog lie... for a while anyway!

Sounds like good fun
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  #43 (permalink)  
Old 05-19-2017, 11:58 PM
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Quote:
Originally Posted by Coyote-Frostbyte View Post
I took it briefly out of the 2200 ham band to a nearby NTIA frequency I can access and ran a brief test-- 2150 watts into the antenna, a narrow band frequency shift test signal..
.
And.....
.
Bingo! .............. RST 569 at ~250 miles.
That's outstanding. Have you calculated what your ERP and antenna efficiency is? Base loaded, I presume, with that huge coil...
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  #44 (permalink)  
Old 05-20-2017, 2:21 PM
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Oh, I couldn't do all that installation without at least trying it out-- albeit briefly... ....(laughing.)
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A telephone call got a 48 hour release to use a frequency slightly below 137...not that I was putting anyone out- the frequency has no occupants...
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A couple more calls to my friend set up a listening post in New Mexico.
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Thus far I have done nothing with any telemetry to the transmitter, so I had no way, yet, of being at the transmitter site and remotely listening to its signal- However, my friend on her mobile ('cel) patch'd me back to the site, giving me feedback as to what she was hearing.
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On the night before my returning to New Mexico, we ran the test. We wait'd until after dark, the temperature outside the hut was a balmy 8 degrees F, electric space heaters brought the inside to a tropical 60 or so. The blizzard of the past several days had blown itself out-- it was a clear, windless night- the sky- crystalline- with a million stars against the Milky Way.. In other words, a bloody cold night to be out on a mountain side!
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I brought the tower into approximate resonance- tuning initially at 100 watts- straight continuous carrier. My friend report'd she could "hear something" (note the highly scientific method utilized here )
I increased the power to ~ 1Kw-- everything was holding together (ie; no sparks or arc's) but then, at full output--- all hell broke loose- With blinding crashes, the tuning circuit flared into a beautiful blue corona- looking for all the world like a Jacob's Ladder.... taking my breathe away ! ....when back'd off to 2Kw it became stable, but now I could hear crackling sounds outside the hut.
Looking at the tower and the large copper strap that connected it to the inside; practically every sharp point had a small corona sparkling in that clear, silent night. I can only guess at the RF voltage of my Tesla Coil. Those discharge surfaces,-- to be addressed this summer.....
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Now my friend was reporting a definite, clear signal... "a 5 to 6" (RST)-- again, note high degree of scientific precision. At his power level, I later model'd the ERP at 3.5 watts-- approximately 5db's above what would be allowed on 2200. I did not attempt that evening to calculate what the power output would have to be to achieve the 1 watt ERP limit for the ham band- but it was proven a signal could be heard from 0.1 Kw upwards.
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We then called it a success; -- I shut everything down-- and headed home to a roaring fireplace.
.
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........................................CF

Last edited by Coyote-Frostbyte; 05-20-2017 at 2:44 PM..
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