391/392 MHz Control Channels

[Mickier]

When the skip conditions happen every evening these frqs. are heard loud and clear in Los Angeles County. They were full scale while we were in downtown San Diego.

Has anyone else heard Control Channels on 391.0625 and 392.6625 MHz? Thanks! Someone told me it might be a TETRA TRS, and it could be in Baja.

http://en.wikipedia.org/wiki/TETRA

[Mickier]

While at the SkyShow at Qualcom Stadium Saturday I could hear control channel sounding activity on these frqs. using a Uniden BCD396T and a Radio Shack PRO 92:

391.0625
392.3000
392.4875
392.8750

It was not a Motorola TRS that I could tell however, the 396 would not show a System ID.

[eatnews]

There is also low power audio and video in that band mostly used by private detectives.

[Brian]

Mickier

Maybe those 392.#### freqs you found was on this system from Mexico
http://www.radioreference.com/apps/db/?sid=2169

[Brian]

380-400 has been reallocated, and is no longer military aircraft. It's now military trunking systems

It takes a while for the 'word' to percolate through those hard military skulls.

Saw this on http://mt-milcom.blogspot.com page:

Friday, October 05, 2007
380-400 MHz Aero ATC Frequencies
http://mt-milcom.blogspot.com/2007/10/3 ... ncies.html

On one of the forums on RadioRef there seems to be some confusion recently regarding the frequency usage in this new subband. Contrary to a couple of reports this band is "not" now or will it be in the immediate future totally LMR.

As I have previously reported in my Monitoring Times Milcom column this new subband will be a mix of aero; wideband signals; and simplex, repeater, and trunk radio systems.

As I pointed out on that RadioRef forum I have identified 39 frequencies that will remain FAA/DoD Air Traffic Control assignments. These frequencies are as follows:

380.0000 380.0250 380.0500 380.1000 380.1500 380.2000 380.2250 380.2500 380.3000 380.3500 380.6000 381.4000 381.4500 381.5000 381.5500 381.6000 381.6500 382.0000 384.4000 385.4000 385.4250 385.4500 385.5000 385.5500 385.6000 385.6500 387.0000 387.0250 387.0500 387.0750 387.1000 387.1500 388.2000 390.8000 391.9000 392.0000 392.1000 397.8500 397.8750 397.9000 MHz (AM mode)

You want more goodies including frequency assignments in this new subband you will need a Monitoring Times subscription. That is what pays my bills and put food on ye ole table. )

[Batman2150]

Has anyone else heard Control Channels on 391.0625 and 392.6625 MHz? Thanks! Someone told me it might be a TETRA TRS, and it could be in Baja.

http://en.wikipedia.org/wiki/TETRA

Are you sure your scanner is not hearing an "image" from another band?

[Batman2150]

380-400 has been reallocated, and is no longer military aircraft. It's now military trunking systems, and also military in-squad radios (the military version of FRS radios... in fact, they use a custom variant FRS retuned to their channels in this range.

The (ICOM) Intersquad radios use:

CH-01 396.8750
CH-02 397.1250
CH-03 397.1750
CH-04 397.3750
CH-05 397.4250
CH-06 397.4750
CH-07 397.5500
CH-08 397.9500
CH-09 398.0500
CH-10 399.4250
CH-11 399.4750
CH-12 399.7250
CH-13 399.9250
CH-14 399.9750

There are quite a few military trunking systems going in all over the US in the 380 range, we certainly have one at Miramar, with a control channel of 385.350, and I believe there are several more around southern california. The BC396T will handle these trunk systems, though they are generally supposed to be encrypted once fully installed and gotten working. So far, I don't believe the Miramar one is using encryption. (They are P25)

What power output do these military "FRS" radios have?

[SkipSanders]

Not CERTAIN they don't up the power, but I believe they use the same half watt power as FRS. They have the same intended very short range use, no more than a mile. I doubt they'd use more than 1 watt, bearing in mind all squads would have the same 14 channels, and they wouldn't want them covering too much area, not to mention the possibility of interception.