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400 mHz trunking?????

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mpdonala

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Can anyone help with how to program a 400 mHz Trunking system into a uniden 250D have local military bases that are on it and we are trying to get them programed right. Any help would be appreciated. Mark in Colorado
 

mciupa

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The key to monitoring this site is to program the system in Motorola-UHF
mode.

You must first enter a base freq. which is 406.000 mHz. The next
step is to set an offset. According to the database it is 12.5 kHz.
If you look at the list of freq. for Fort Carson, you'll see that each
freq. increases by that amount(12.5 kHz or .0125 mHz)
Now you can enter the freq. for the system.
Put your scanner in Search mode and it should start tracking
if the system is active.
Let us know. Good Luck.
 
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Some 400 Mhz have base frequencies which are higher than 406.000!

Here is an example of one:

http://www.radioreference.com/modules.php?name=TRSDB&sid=2608

Federal Medical Center Rochester System
Rochester, MN


System Name: Federal Medical Center Rochester
Location: Rochester, MN
County: Olmsted
System Type: Motorola ASTRO 3600 baud
Digital Type: APCO-25 Exclusive
Last Updated: 01-09-04 17:29 Changed talkgroups
Hits: 317

Custom Frequency Table

1
Base: 407.0000
Offset: 12.5
Spacing: 380
 

mciupa

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GlacierClipper said:
Getting the correct talkgroups users description sounds interesting!

Filling in the blanks would be nice.

Mr. m we have a little job for you..... :wink:
 

mpdonala

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Thanks

With the Uniden 250D was not sure what to program the system as Motarola type 1 or type 2 800 or what nobody around here has had much luck. Brand new system so doing alot of programing and re-programing. It appears that we have all the freq's and talk group just got to figure out how to get it to work now. THANKS for all of the input. mpdonala
 

mpdonala

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400 mHz

Can anyone tell me if there is an easy way to figure out the spacing. Trying to listen to Fort Carson FD. Need any help that one can offer.
 

mpdonala

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400 mHz

Can anyone tell me if there is an easy way to figure out the spacing. Trying to listen to Fort Carson FD. Need any help that one can offer.
 

loumaag

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Katy, TX
Re: 400 mHz

mpdonala said:
Can anyone tell me if there is an easy way to figure out the spacing. Trying to listen to Fort Carson FD. Need any help that one can offer.
Well, yse. The Uniden has a very strange way of calling one thing something else. The actual spacing (according to our information) is 12.5KHz. The offset should be 380 (as this is normal). What Uniden chooses to call these things is a mystery but in any case the right numbers should go in the right spots. :D

Real Definitions:
Spacing = The distance in KHz between adjacent channels
Offset = The first channel number used in the channel line up for the base frequency. 380 (Hex 0x17C) is the normal "first" repeater output channel, those below 380 are input channels.

In some VHF/UHF systems, you may find more than one Spacing/Offset/Base setup for the system.
 
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