[FedCom] Uniden BC-796D

[Chris Parris]

Hi, Jim...

I'll see if I can answer some of your questions...

>>> =

I am still coming up to speed on P25.  As I understand it, for P25 radios=

to
communicate with one another they need the following settings to be the
same:

1)  Network Access Code  (NAC)

2)  Talk Group Identification (TGID)

3)  Mobile Manufacturer Identification (MFID)
<<<

I have read some on the NAC, but was not aware of the TGID or MFID. I
assumed that the term "talk group" was usually applied to trunked radio
systems, and not conventional systems.

>>>
With the Uniden BC-796D, does the end user program a given frequency and
the
scanner will decode either analog or P25, or do you need to program which=

type of modulation?
<<<

You need only program the radio as FM or NFM. You can not program a CTCSS=

or DPL tone on a digital channel or it will ignore the digital
transmissions.

>>>
Another question I have is about the P25 NACs.  I have seen $61F on mutua=
l
aid frequencies.  Is this a nationwide NAC for all mutual aid frequencies=
?
Also, is there are common TGID and MFID for mutual aid frequencies?
<<<

I can't speak to the TGID or MFID, but I have been told that the $61F is
sort of a "default" NAC that gets programmed in to digital channels and i=
s
probably widely used a lot.

>>>
I could program some frequencies twice.  Once with the assigned PL tone
that will block DES noise
if used in the analog mode and once carrier squelch under the theory that=

the auto resume will work if it an encrypted APCO 25 signal.  However, I =
am
wondering if the auto resume ONLY works on encrypted APCO 25.  My thought=

are that it might actually work as well on encrypted conventional.  Maybe=

there is no value in programming the frequency more than once.
<<<

The radio still requires that you have the digital frequency programmed
with no PL or DPL applied, so having it in the radio twice wouldn't seem =
to
accomplish much. If you were trying to eliminate some sort of interferenc=
e
by using the PL/DPL, you would miss the digital transmissions.

I would prefer that in future models of digital radios, they could pick o=
ff
the P-25 digital detection prior to the CTCSS or DPL decoding, so that yo=
u
could put a PL tone on a digital channel. Either that or give us the
ability to use the NAC's !

- Chris

 --
Chris Parris
cparris2@compuserve.com
www.groups.yahoo.com/group/pdxmilcom
www.live365.com/stations/cparris2