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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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pro43_01.doc
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1997-02-01
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52 lines
INSTRUCTIONS FOR PRO-43 CELLULAR RESTORATION
1. Remove the battery pack and cover.
2. Remove the four screws on back and GENTLY pry apart.
3. Remove the 6 silver screws from the 1st PC Board.
4. Remove solder from the ground pad and center feed
conductor of the antenna directly under the antenna on
the PC Board heat solder on top PC Board and center
feed will loosen, this is the only really tricky part
to this.
5. Disconnect the 2 plugs/wiring harness, make note of the
color scheme for reinstalling. Harness has 2-metal
guides on the side....BE CAREFUL NOT TO PINCH WIRES.
6. Lift top board away from bottom, paying careful
attention the black plug near the bottom of the
assembly, gently pry this apart. DO NOT FORCE IT!
7. Remove 2-silver screws from the 2nd PC Board.
(remember to replace on re-assembly)
Disconnect the 2 wire connector at the top and
remove the 2nd PC board.
8. Remove solder from the four points on the large silver
shield covering the microprocessor board. Remove
shield. Make sure to replace shield on re-assembly
as this serves as protection from intermod and
interference.
9. Near the bottom you will see a row of surface mount
diodes (very small and square, approx. 1/32" long,
black with gray markings) These will be in locations
marked D1, D2, D3, D4, D5. Some of the locations
are blank.
10. Use a very low temp iron (15-watt) and the smallest
solder wick available, remove the solder from both
sides of D4. Use hemostats or needle nose (very small)
to grip while de soldering. Remove diode D4.
11. Once D4 is removed you will have full 800 MHZ coverage
and 30 KHZ spacing on cellular.
12. Save the diode you removed from the D4 position and
install it in the D3 position being careful to make
sure the diode is facing the same direction it was in
the D4 position. (same as D2) This will increase the
low band coverage from 30-50 to 30-88 Mhz.
13. Carefully reassemble unit remembering to double check
before going on to next step.
USE THIS PROCEDURE AT YOUR OWN RISK!!!!
The 800 Mhz reception on the PRO-43 is superb.
When you've reassembled the unit. Hit MANUAL, PROGRAM,
LIMIT, 870.00 ENTER, HIT LIMIT UNTIL "H" APPEARS AND THEN
890.00 ENTER. PUSH THE "UP" ARROW AND YOUR IN BUSINESS.
With this modification, this really is a great radio.
ENJOY!