From: armille
Newsgroups: alt.radio.scanner
Subject: TWO frequency mods for the PRO-43
Summary:cellular (870-890 MHz) and low band (51-88 MHz) restoration for PRO-43
Message-ID: <1992Aug20.045656.5971
Date: 20 Aug 92 04:56:56 GMT
Distribution:usa
Organization: The Great Beyond
Lines:51
A few people have mentioned the cellular mod for the PRO-43; it turns out
you should not remove but MOVE the diode. Doing so allows cellular coverage as
well as low band (up to 88 MHz) coverage.
Acknowledgments to Grove Enterprises; this information came from them.
They are selling the PRO-43 for $300 which is $50 less than Radio Shack.
I have no connection with them other than as a satisfied customer.
PRO-43
Cellular Frequency Restoration and Low Band Expansion
Note:It is not lawful to monitor cellular or conventional mobile telephone
conversations.
The following procedure requires familiarity with microcircuit soldering and
will violate your warranty. Grove Enterprises assumes no liability resulting
from its attempt, nor will accept the modified scanner for return under any
condition.
TOOLS NEEDED:Fine point, low power soldering pencil; solder wick or a
desoldering tool; pointed awl, hemostats or pointed tweezers; small Philips
screwdriver; solder.
1) Remove the battery, antenna and back cover (held in place by four screws).
2) Remove the six screws holding the top circuit board in place. Carefully
unsolder the two antenna connections from the board. Bend the antenna ground
tab fully up from the board. Carefully lift the board, unplugging the black
connector at its base, and lay the board out of the way on its bundle of
colored wires.
3) Remove the two screws from the next board and lift it, carefully unplugging
the white connector at the bottom of the board. Lift it up and lay it aside on
its brown wire (which can be unplugged if necessary).
4) Unsolder and remove the metal shield from the final board, revealing the
microprocessor; note the row of diodes labeled D1-D5 above it. Only diodes
D1, D2, and D4 are present; assisted by a pointed tool, unsolder and remove D4,
the lone diode (this restores cellular frequencies which will be searched in 30
kHz steps).
5) Resolder the removed diode carefully into position D3 to extend low band
coverage to 88 MHz.
6) Reassemble the boards, paying particular attention to the alignment of the
plugs. Test the radio by entering any frequency between 870 and 890 MHz
(cellular) and 51-88 MHz (low band).
--
A. Ray Miller
arm
SOURCE: The QRZ Windows Ham Radio CDROM |
