[aprssig] More on DTMF Messaging

Mark Earle wa2mct at mearle.com
Wed Oct 8 21:38:31 EDT 2008

> monitoring the APRStt simplex channel (147.51).  Soon your TH78
Whoa!   Where did this frequency selection come from?

It's not a 20k spaced channel.

Both 147.50 and 147.52 are in use in my state - even way out here in 
EL17HQ I hear traffic on both, often. It is more used in the Houston and 
San Antonio area. With some other problems, (see below) 147.50 may be 
unusable due to D-Star.

You should at least pick a frequency which is OK with 15k and 20k band 

Also be aware, there is a proposal here in TX to use these pairs for 
D-Star 2m repeaters:

146.450/147.450 MHz
146.460/147.460 MHz
146.470/147.470 MHz
146.480/147.480 MHz
146.490/147.490 MHz

I do not think this is a good idea, and it is not yet in the standards; 
yet there are a few (3 that I am aware of, as a non-D-Star user) systems 
already on the air on some of these frequencies. So, in TX, the D-Star 
useage is reducing the available 2m simplex channels for FM voice.

Further details here:


Note that this proposal was NOT passed at the August 08 Society meeting.

But it is still under consideration.


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