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- From: ag684@cleveland.Freenet.Edu (Mark Stephany)
- 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@convex.com (David 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
-
- Copied from the QRZ! Windows Ham Radio CDROM
-
-