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- From: armille@afterlife.ncsc.mil (A. Ray Miller)
- 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@afterlife.ncsc.mil>
- 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@super.org | armille@afterlife.ncsc.mil
-
-
-