Digital Simplex List and Information

The purpose of this list is NOT to reserve exclusively these frequencies for DMR or any digital use but only to provide some common frequencies to more practically enable use of simplex on the fly anywhere in the USA as front panel programming is not available and talk-around (direct on a repeater pair) is unworkable.  See current table for UHF/VHF.

The discussion has wound down and as of 6-12-2013.  The repeater list and talkgroup page have been updated and has the simplex channels listed at the bottom of the page.  If you have any last minute issues with the simplex listing, then make it known in the Yahoo Groups.  The simplex listing has been renamed National Digital Simplex so to include all 12.5Khz (or narrower) digital modes rather than limiting it to only DMR.

The rest of this page is legacy and now stale...


This page is only a mock-up to aid in the discussion in support of creating a wide-spread list of DMR Simplex channels for use in the USA.  More work will follow for VHF and worldwide for DMR and possibly the other digital modes.  This page will change frequently as the discussion narrows the concerns of the digital (and analog) community.  The main focus currently is for digital UHF in the USA.
While this list is primarily developed for DMR simplex, all digital modes using 12.5 Khz wide channels or less, are welcome to use the frequencies as well as participate in our discussion to develope this list of frequencies.  Anyone is welcome to submit any area exceptions that they would rather us not use.  This is a community effort that is striving to garner the best use of limited channel space in the 440-450 band.
Latest information in our discussion: read the posts in both MototrboUSA  and Mototrbo Yahoo groups.
Temporary annotations are right margin in turquoise.

USA VHF Digital Simplex (discussion ongoing)

## Mode Label  (15 digits) Notes, Exceptions
01 145.6700 National Digital Simplex Calling channel?
02 145.6500 ?
03 145.6300 ?
  145.6100 ?
 
  144.3100 possibles
  144.3700 possibles
Defaults:  Talkgroup ID 1, Color Code 1, Timeslot 1
Alternates: Talkgroup 2 on Timeslot 2 for Gen 2 capable radios

 

More work needed below, more a placeholder for discussion after USA UHF and VHF discussions

 

Worldwide VHF and UHF Digital Simplex

## Frequency Notes, Exceptions
01 433.4500 Friedrichshaf Germany
02    
03    
04    
05    
06    
 
Defaults:  Talkgroup ID 1, Color Code 1, Timeslot 1
Alternates: Talkgroup 2 on Timeslot 2 for Gen 2 capable radios

 


Discussion on this table is now ended as of 6-12-2013

USA UHF Digital Simplex (Rev 3; 6-8-13)

## Mode Label Notes, Exceptions  
01 01  441.0000 National Digital Simplex             [appears to be the best freq yet for simplex]
02 03  446.5000

National Digital Simplex, Secondary      [appears next best freq yet for simplex]

03 03  441.0125 [Suggestion to move farther away than a splinter]       [1st splinter above 441]
04 04  440.9875 [Suggestion to find something in 430-440]       [1st splinter below 441]
05 05  446.5125  [1st splinter above 446.5]
06 06  445.9875 [1st splinter below 446.5]
07 07  446.000 ANA National UHF Simplex (Analog)
08 Custom Ch [Your local simplex or custom channel in zone if desired]
09 Custom Ch [Your local simplex or custom channel in zone if desired]
10 Custom Ch [Your local simplex or custom channel in zone if desired]
11 Custom Ch [Your local simplex or custom channel in zone if desired]
12 Custom Ch [Your local simplex or custom channel in zone if desired]
13 Custom Ch [Your local simplex or custom channel in zone if desired]
14 Custom Ch [Your local simplex or custom channel in zone if desired]
15 Custom Ch [Your local simplex or custom channel in zone if desired]
16 Custom Ch [Your local simplex or custom channel in zone if desired]
 [Other TG's being considered: "All Call" or MARC's USA #300]
Defaults:  Talkgroup ID 99, Color Code 1, Timeslot 1, [Color Code Free & Always on TX]
Alternates: Talkgroup 2 on Timeslot 2 for Gen 2 capable radios

 

It is recommended that you contact the local area coordinating counsels when using our recommended simplex frequencies to insure an interference free session.

If you wish to comment, correct or provide an exception for use in your area, please send them to dci@trbo.org  Provide sufficient data so that we can correct or add the except for your area.


USA UHF Digital Simplex (Rev 2; 6-6-13)

## Mode Label Notes, Exceptions
01 01 445.0125 National Digital Simplex, (Chicago Repeater Links)
02 03 440.0125

National Digital Simplex, Secondary        [Complement of channel 1]

03 03 445.0375  
04 04 440.0375  
05 05 445.0625  
06 06 440.0625

[Even/odd channels complement input/output]

07 07 445.0875  
08 08 440.0875  
09 09 445.1125  
10 10 440.1125  
11 11 445.1375  
12 12 440.1375  
13 Custom Ch [Your local simplex or custom channel in zone if desired]
14 Custom Ch [Your local simplex or custom channel in zone if desired]
15 Custom Ch [Your local simplex or custom channel in zone if desired]
16 Custom Ch [Your local simplex or custom channel in zone if desired]
 [Other TG's being considered: "All Call" or MARC's USA #300]
Defaults:  Talkgroup ID 99, Color Code 1, Timeslot 1
Alternates: Talkgroup 2 on Timeslot 2 for Gen 2 capable radios

Other frequencies under discussion and consideration

446.0750  Current Primary Digital Simplex, standard 25 Khz channel spacing and repeater pair
441.000  
441.500  
446.500  

 

USA UHF Digital Simplex Rev 1 (to be deleted)

## Mode Label  (15 digits) Notes, Exceptions
01 DMR 445.8100 [simpler label as suggested by Jerry]
02 U02 445.8125 DM [orig label so you don't have to look at your selector]
03 445.8375 [simpler label yet; we know it's a TRBO radio]
04 04 445.8875 [possibly the best label yet; channel # is included so you don't need to look at the selector when selecting a mode]
05 U05 445.9125 DM  
06 U06 445.9375 DM  
07 U07 445.9625 DM  
08 U08 445.9875 DM Detroit APRS on 445.9250
        [446.000 USA National UHF Simplex]
09 U09 446.0125 DM Chicago Repeater Links
10 U10 446.0375 DM  
11 U11 446.0625 DM  
12 U12 446.0875 DM  
13 U13 446.1125 DM  
14 U14 446.1375 DM  
15 U15 446.1625 DM  
16 U16 446.1875 DM

Other TG's being considered: "All Call"

 
Defaults:  Talkgroup ID 99, Color Code 1, Timeslot 1
Alternates: Talkgroup 2 on Timeslot 2 for Gen 2 capable radios

 

It is recommended that you contact the local area coordinating counsels when using our recommended simplex frequencies to insure an interference free session.

If you wish to comment, correct or provide an exception for use in your area, please send them to dci@trbo.org  Provide sufficient data so that we can correct or add the except for your area.

 

Generation 1 Legacy List (to be deleted)

National TRBO Simplex Frequencies

UHF: 1) 446.075   2) 445.925   3) 433.000   4) 434.000   5) 435.000
VHF: 1) 145.790   2) 145.510   3) 146.510
Color Code 1 and Talkgroup 99  (Timeslot 1 if your radio is capable of "2 slot simplex")
On-going discussion and fine-tuning on the MTUSA and/or MotoTRBO Yahoo Groups; comments welcome

 

Revised: 09/19/2014 05:43

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