From: ag684
Subject: Re:Mods for PRO-43
Date: 18 Oct 92 13:18:07 GMT
This is what I've got on the Pro-43, not my words.
========================
PRO-43
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.
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).
------------------------------------------------------------------------------
From: horak
#Subject: Re:Mods for PRO-43
Date: 19 Oct 92 17:14:41 GMT
I would be very careful about re-installing the diode for 51-88
coverage. In earlier Pro34/37 models, this could be done too (I did
it). The scanner would indeed program the new frequency limits, but
would not pick up anything in that band. I later discovered that I
would have to re-align the receiver to pick up anything. Also, in the
34/37 models, restoring the 54-88 band REMOVES the 30-54 band! I had an
external toggle switch, so I could go back and forth but it was of
little use, since the radio had to be re-aligned each time I wanted to
change bands. The Pro-43 is a different animal, so I can't say for sure
what it can/can't do. Just beware of the possible problems of restoring
the 51-88 band.
David
SOURCE: The QRZ Windows Ham Radio CDROM |
