[FedCom] 163.9875

[Signal500 at aol.com]

Bob,

You are correct about needing separation between 163.8375 and 163.9875.  I 
think that 163.8375 is the main RF link input frequency to many repeaters in SW 
MO and NW AR.  When 163.8375 is active, it is simplex only and there are a 
number of different repeater outputs.  I would venture to say that these 
repeaters are located many miles from each other and that is why I heard 163.8375 and 
163.9875 together last night.  The signal strength of 163.9875 repeater was 
not strong at all from my location [possibly located in NW AR].  I do know that 
the 163.8375 transmitter is located about 500 feet above the ground on an FM 
tower south of Springfield and it was at full signal strength at my location 
last night.  I would also guess that the Kansas City office has a land line or 
microwave link to the 163.8375 site in order to control and communicate to the 
area repeaters down here.

You said in a post many months ago that the 165.925 repeater out of KC is 
sometimes encrypted almost constantly during the day.  I would venture to say 
that is the input frequency for other repeaters in the region and that they are 
busy running NCIC and license plate checks for all of there field offices on 
this frequency.  I know in years past [back in the good old days where all 
transmissions were in the clear] that the Springfield FBI would call KC office 
"570" for all of there license plate checks and NCIC inquiries.

Here is what I have come up with so far for the repeater outputs [PL 167.9]:

167.2375 repeater out located in Branson, MO
167.3625 repeater out located in Springfield, MO for local operations / hand 
held radios
167.6875 repeater out located in the Springfield, MO area, wide area coverage 
167.5125 repeater out located in the SW MO / NW AR area ?
167.7125 repeater out located in the SW MO / NW AR area ?
163.9875 repeater out located in the SW MO / NW AR area ?
165.975 [167.9] Simplex surveillance

Signal500



In a message dated 10/6/2006 10:33:29 AM Central Standard Time, rankin at ku.edu 
writes:
That's really interesting.  Ordinarily a greater separation is required 
between the input and output frequencies in order to prevent the high powered 
repeater from covering the input signal it's trying to hear and repeat.  The 
repeater receive site would need to be quite a distance from the transmit site for 
this pair to work well.  Also, isn't 163.8375 normally the input to their 
portable repeaters with outputs on 167.5375?  (I may be wrong about this last.)

Bob, w0nxn

________________________________

From: fedcom-bounces at mailman.qth.net on behalf of Signal500 at aol.com
Sent: Thu 10/5/2006 10:03 PM
To: fedcom at mailman.qth.net
Subject: [FedCom] 163.9875



General location: Southwest MO.  FBI currently active.  DES-XL encryption
analog. No "in the clear" comms at all.

163.8375 IN  PL 167.9
163.9875 OUT

Also heard 167.7125 repeater output [analog] being keyed up at the same time.

Signal500
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