ARLA/CLUSTER: Ham Radio scanning using the Whistler TRX-1 on DMR

João Costa > CT1FBF ct1fbf
Segunda-Feira, 26 de Dezembro de 2016 - 18:11:28 WET

Ham Radio has changed in recent years from traditional point to point
communication using Frequency Modulation and Single Side-band modes of
communication to Digital Modulation.

Radio Ham networks now include D.M.R. or Digital Mobile Radio and a
great hand-held receiver to use to translate the digital transmissions
is the Whistler T.R.X.-1 and its bigger desk top version the T.R.X.-2.
These two receivers are capable of allowing D.M.R. to be received.

Digital Radio Transmissions are created by a process called T.D.M.A.
it stands for Time Division Multiple Access and one of the major uses
of this technology is the G.S.M. system, or Global System of Mobile
often referred to as the cellular network.

Listed below are some of the features of the Whistler receivers.

The Whistler T.R.X.-1 and T.R.X.-2 allow Radio enthusiasts to not only
receive Ham Radio they also allow the hobbyist to listen to many
commercial transmissions which take place on the V.H.F. and U.H.F.
spectrum. The Whistler covers this frequency range, The frequency
coverage is: 25-54, 108-136.99, 137-174, 216-512, 764-781.99,
791-798.99, 806-960 (excluding former cellular phone bands) and
1240-1300 MHz These are the Tuning Steps: 2.5, 3.125, 5, 6.25, 7.5,
8.33, 10, and 12.5 plus 25 kHz.

Whistler has also announced that development of N.X.D.N. monitoring is
underway and the T.R.X.-1 and T.R.X.-2 will include N.X.D.N. as a free
upgrade when available. I understand that this upgrade is now
available from Whistler, December 2016.

N.X.D.N. is a digital protocol developed by I-COM and Kenwood.

Both the Handheld and Desktop & Mobile models feature a full back-lit
alphanumeric keypad in addition to the easy-to-use Scan, Pause, Select
and Navigation controls.

The Whistler indicates the time slot and colour code. It also allows
monitoring of analogue signals.

Other features include:-
Upgradable CPU, DSP, and library
Store Favourite Scan lists
EZ Scan PC Software
I.F. output for connecting to a computer and additional software.
Receiver permits recording of channels and saves them into a Windows
compatible audio file
Clock and calendar function adds date and time info to the recordings
Dedicated Weather button
Spectrum Sweeper
Programmable audio and visual alert system

Using my two metre and seventy centimetre vertical aerial mounted on
the end of my house about 8 feet above the apex of the roof allowed me
to hear my local D.M.R. Ham radio repeater which users the
Brandmeister network about 5 miles away. The V.H.F. spectrum here in
the U.K. around 165 Megahertz has many digital transmissions.

The U.H.F. band from 455 Megahertz through to 457 Megahertz has a
number of security and Industrial transmissions. 446 Megahertz has
several channels designated for digital use. I would suggest you use
good low loss coaxial cable between the aerial and your receiver,
R-G-213 is the best, you can easily make up a pig tail lead or
purchase one for the final connection to the receiver.

John Allsopp G4YDM

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