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