Msg#:13989 *Shortwave Echo*
07-27-90 23:05:00
From: SKIP SANDERS
  To: TIM JOHNSON
Subj: REPLY TO MSG# 13882 (RE: CUSTOMS/NUMBERS?)
the US Customs have a system called "Customs Over The Horizon Enforcement Radio
Network" (otherwise known as COTHERN) which has (I am told by an artile in the 
latest Monitoring Times) 10 channels (out of approximately 50+ channels 
available to US Customs in HF) which are scanned by Customs vehicles and bases.
A digital "SELCAL" signal is sent out occasionally by various stations to allow
propagation on each channel to be tested, and a central system to "know" what 
stations are contactable... when a unit wants to contact another unit, they 
send that unit's selcal code, and it responds, locking both onto one of the 
channels involved. Scanning then stops until manually restarted after the 
conversation is over.
 
The Channels (that I know of) in this system are:
7527.0
8912.0
10242.0
11494.0
13312.0 (note that this is also a Flight Test frequency!)
15867.0
17952.0
18594.0
 
This leaves 2 more channels to find, likely either below 7527, or above 18594, 
I'd suspect.  The Miami Customs C3I Center is "SLINGSHOT", and the Riverside CA
Customs C3I center is "HAMMER"
--- QuickBBS 2.64 reg
 * Origin: Gandalf's - San Diego, Ca - 619-466-9505 - VHST (1:202/302)