[Scan-DC] Montgomery county rebanding

[Henry Gardner]

Now I'm really confused.

-----Original Message-----
From: scan-dc-bounces at mailman.qth.net
[mailto:scan-dc-bounces at mailman.qth.net] On Behalf Of mike agner
Sent: Tuesday, January 24, 2012 10:13 PM
To: scan-dc at mailman.qth.net
Subject: Re: [Scan-DC] Montgomery county rebanding

On Tuesday, Alan Henney wrote:
=============================================
If you have a scanner that is control-channel tracking, just add
thesechannels to the Montgomery County system info:  You will be covered
when thechange is made, assuming talkgroups remain unchanged.

853.9375
853.8875
853.8625
853.6875
868.9375
868.8875
868.8625
868.6875

==========================================================

Not quite true, I'm afraid. If you examine the frequencies for the system on
the RRDB, as shown here

http://www.radioreference.com/apps/db/?sid=2142

You will note that some of the frequencies have a zero in the fourth decimal
position. In this case, when the frequency is rebanded, the resulting
channel calculation will put it on a channel that the old bandplan won't
recognize. A custom table will very likely be needed to copy this system
when it rebands, particularly since this is one of those 'mixed mode' 
systems. If it were fully digital, all this futzing around wouldn't be
needed...

A lot of the information necessary for modifying scanners to follow rebanded
systems (including the values for the custom table) can be found in links in
Section 7 of the following wiki article;

http://wiki.radioreference.com/index.php/Rebanding

best regards..Mike


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