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Ham Radio Version 3.2 (Chestnut CD-ROMs)(1993).ISO
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pro2004.4
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1991-02-22
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PRO2004.4
Part 1/4
The Radio Shack PRO-2004
Programmable Scanner
(c)1987 - Bob Parnass, AJ9S
Manufactured in Japan, by General Research Electronics,
the Radio Shack PRO-2004 is a 300 channel, wide
coverage scanner radio, incorporating NBFM, WBFM, and
AM modes.
Although the catalog description doesn't do the radio
justice, the microprocessor circuitry provides features
not found in other scanners.
This review, although admittedly subjective, focuses on
three broad characteristics: feature set, basic elec-
trical performance, and mechanical construction.
Frequency Coverage
The PRO-2004 literature states that coverage is from
25-520 and 760-1300 MHz. Radio Shack's last minute
decision to remove cellular telephone frequency
coverage from the PRO-2004 caused a 7 week delay in its
introduction. A small card is now packed with each
scanner, informing the buyer that the radio will not
operate in the 825-845 and 870-890 MHz ranges.
A matrix of diodes, attached to the microprocessor's
input port, is often used to configure radios for sale
in different markets. From recent flux on the circuit
board, it appears that a diode has been added or remo-
ved from my PRO-2004, and this may be how the cellular
telephone coverage was yanked.
Lots of Memory
The PRO-2004 has the usual features that scanner buffs
have come to expect: individual channel lockouts,
selectable rescan delay, an external speaker jack, etc.
But, the 300 channel capacity of the PRO-2004 sets an
industry record! Casual scanner users may scoff at the
usefulness of having so many channels, but seasoned
monitorists can have those channels filled up in no
time flat, especially with frequencies in the vast
225-400 MHz military air band.
With so many channels to program, one dreads the
thought of a power failure, which could clear memory in
a hurry. Not to worry, the PRO-2004 memory is backed
up by a conventional 9 volt alkaline battery (not sup-
plied). The 300 channels are divided into 10 banks of
30 channels each, and one can select or deselect any
channel bank from the scan list. Individual channels
can be locked out in the customary way, but the PRO-
2004 provides a new feature, a LOCKOUT REVIEW. Succes-
sive depressions of this key step through the locked
out channels.
The owner's manual refers to the ability to delete a
channel by storing a 0 frequency in it, not a particu-
larly useful exercise. The scanner will still spend
time scanning a "deleted" channel unless it is locked
out with the LOCKOUT key, which then means it appears
in the lockout list when using the LOCKOUT REVIEW
feature.
Scanners worth their keep have a priority feature, with
channel 1 usually designated the priority channel. The
PRO-2004 is more flexible; any of the 300 channels may
be designated the priority channel. When the PRIORITY
key is depressed, that channel will be sampled every 2
seconds, and the radio will stay there if a signal is
heard.
The PRO-2004 has two scan speeds, although one would
probably use the faster, 16 channel/second speed in
most instances. This compares favorably with 14
channel/second speed of the Bearcat 800XLT.
When programming a channel, the PRO-2004 firmware sets
the mode automatically, based on its idea of what mode
is most prevalent on that frequency. This feature
saves extra keystrokes, and makes one appreciate the
thought that went into the design of this radio. The
default mode can be overridden easily, if need be, like
to listen to a NBFM satellite in the 225-400 MHz range,
which is mainly populated with AM signals.