[FedCom] Questions
joe baeza
[email protected]
Fri, 24 May 2002 17:18:11 +0000
Hi,
I hate to be the messenger of bad news, however, Customs Air in San Diego uses coded comms with both fixed-wing aircraft and their A-Stars helos on a regular basis.
Joe
>From: [email protected]
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: [FedCom] Questions
>Date: Thu, 23 May 2002 18:43:01 EDT
>
>In a message dated 5/23/02 11:13:57 AM Central Daylight Time,
>[email protected] writes:
>
><< Why can't most (if not all) surveillances with aircraft talk coded?
> Does it have something to do with synchronization?? >>
>
>I don't recall ever hearing aircraft, particularly helicopters using DVP/DES.
>As near as I can figure (and I'm certanly no expert), it might have something
>to do with the rotation of the main rotor.
>
>I know a lot of electrical energy is produced by a spinning rotor, so perhaps
>there is too much noise for DVP/DES to function, i.e. to deconstruct an
>analog transmission, convert it to digital and send it off, or vice versa.
>That may also be one of the reasons that the military went with
>frequency-hopping radios rather than encrypted radios in their helos. Of
>course frequency hopping is also more resilient to SIGINT attempts.
>
>I also wonder if it's a matter of all the other noise in the RF spectrum.
>Look at your average congested area: a cacaphony of spurious junk.
>
>164.5500 (167.9 PL) (simplex) was in use in the skies over Chicago the other
>day. It's ordinarily encrypted, but obviously this wasn't possible this time
>out.
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