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Author Topic: UHF mil air  (Read 33348 times)

Offline Josh

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Re: UHF mil air
« Reply #15 on: April 20, 2017, 1612 UTC »
Neacp/tacamo/glass flight burning mux on 366.6MHz 1440Z 20Apr17.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #16 on: April 21, 2017, 1503 UTC »
Neacp/tacamo/glass flight burning mux, ssb voice and digital, on 366.6MHz 1400Z 21Apr17.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #17 on: April 24, 2017, 1407 UTC »
Neacp/tacamo/glass flight burning mux, ssb voice and digital, on 311.0MHz 1400Z 24Apr17. Last nite 0000 local they were on 338.95 for a good while.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #18 on: April 25, 2017, 1513 UTC »
Neacp/tacamo/glass flight burning mux, ssb voice and digital, on 366.6MHz 1400Z 25Apr17.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #19 on: April 25, 2017, 1817 UTC »
Neacp/tacamo/glass flight burning mux on 337.3MHz 1730Z 25Apr17.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #20 on: April 26, 2017, 1526 UTC »
Neacp/tacamo/glass flight burning mux on 338.95MHz 1440Z 26Apr17.
Conveniently located near Vincennes Indiana.

Offline R4002

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Re: UHF mil air
« Reply #21 on: April 26, 2017, 1738 UTC »
Josh, where are you located and what do you mean by "burning mux"?  Are you talking about a multiplexed signal or mux = music?

Sorry about the elementary questions.  You've got a lot of logs so I presume you're in an area of heavy military aircraft activity and have a quality monitoring setup. 
U.S. East Coast, various HF/VHF/UHF radios/scanners/receivers

Offline Josh

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Re: UHF mil air
« Reply #22 on: April 27, 2017, 1722 UTC »
Today our friends were noted on 337.3 @ 1400Z burning (sending) mux 1 or mux 2, a multiplexed (as you expected) rf stream that will include voice and digital and digital voice and anything else they can think of sending, you'll hear a carrier of several KHz on the frequency when they're muxing about up there so you know when you've found them. In setup for a mission you will often overhear the stations mention they're up and "burning" on "RF13" or some other channel descriptor. If you hear some bleeps and bloops like dtmf tones you might expect a phone patch to take place, or sometimes the carrier just drops as they've qsy'd to some other channel to burn on, or have closed the link.

I'm conveniently located in the Midwest where I can hear this traffic that apparently often orbits near the Ohio/Kentucky/Indiana region.
At 40k ft the uhf line of sight is 250mi or so, and they're running a lot of power to very efficient antennas so they have a good bit of UHF range.

Here's some info about what's going on, pay attention to the naoc and tacamo in the image;
http://www.minutemanmissile.com/uhfradio.html

https://en.wikipedia.org/wiki/Boeing_E-4
https://en.wikipedia.org/wiki/Boeing_E-6_Mercury
« Last Edit: April 27, 2017, 1752 UTC by Josh »
Conveniently located near Vincennes Indiana.

Offline R4002

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Re: UHF mil air
« Reply #23 on: April 30, 2017, 1544 UTC »
Josh,

Thank you for clearing that up - I had a feeling you meant multiplexed (as a TACAMO plane transmitting music on a UHF military frequency makes little sense to me).  So they simply use chunks of the vast 225-400 MHz band and multiplex voice/data on a wideband carrier, switching frequencies as they move and/or as the operational conditions warrant.  Sounds like you've got a good monitoring location and setup.  Naturally these guys are running power and high gain antennas.  Even without those, they're 40,000 feet up, as you've said.

U.S. East Coast, various HF/VHF/UHF radios/scanners/receivers

Offline Josh

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Re: UHF mil air
« Reply #24 on: May 01, 2017, 1624 UTC »
Lol I don't know about a good setup for this stuff. Right now it's a Uniden BC9000 fed by a 2m/70cm HAM mobile antenna hanging in the window. The saving grace is the fact the coax run's real short so what sigs do make it to the antennae suffer little loss getting to the scanner.

That being said, soon the permanent V/UHF receive setup will be going up, a Discone fed with 9913 coax and some other antennas such as a turnstyle for the milsats and some others focused on the 220 to 400 range. Various splitters and antennae switches will pipe the rf to various receivers. Then the serious V/UHF monitoring will commence with a RTL dongle feeding decoder apps in the pc. That's the plan at least, as they say in Russia; vsyo na bumage, it's all on paper.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #25 on: May 01, 2017, 1746 UTC »
Neacp/tacamo/glass flight burning mux on 337.3MHz 1700Z 01May17.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #26 on: May 03, 2017, 1820 UTC »
« Last Edit: May 03, 2017, 1831 UTC by Josh »
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #27 on: May 08, 2017, 1527 UTC »
The tacamo ac may also be sending msk on vlf; 17.9kc being one of their noted freqs but they may also occupy other near freqs. Bw for msk will be 190Hz, 400Hz, and 800Hz. A dgps decoder will try to grab something from this signal however traffic is encrypted.
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #28 on: May 09, 2017, 1649 UTC »
Conveniently located near Vincennes Indiana.

Offline Josh

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Re: UHF mil air
« Reply #29 on: May 10, 2017, 1651 UTC »
Air to air refueling comms on 366.1MHz 1630Z 10May17.
Emergency separation training ongoing.
Conveniently located near Vincennes Indiana.