Converting Icom-1050/JWR M2 CB to 10M
             =====================================

It is STRONGLY recommend that you make your own investigations into the
legality of USING one of these rigs, once converted.

These four steps for ICOM 1050 ONLY (improves the ICOM squelch)
-----------------------------------
Remove diode from rear of PCB.
Change Resistor on rear of PCB to 220K.
Remove link R116 and fit 10K resistor.
Change C119 to a 0.47uF (tantalum) +Ve to pin 12.

Do the following for both ICOM 1050 & JWR M2
--------------------------------------------
Change C228 to 30pF (ceramic, VCO).
Remove GREEN wire from IC 201 and put mauve wire in it's place.
Link pins 10, 11, and 12 together with one end of a 10K resistor and connect
the other end of the resistor to pin 1 (+5V).

Note, that is all there is to do to get the rig onto 29MHz!

Remove C309 and C311 completely (improves TX audio).
Change C312 to 1000pF (680pF would do).
Change C106 to 10 or 15pF (RX).

That concludes all the changes, other mods (repeater shifts, more channels
etc.) can be done later if desired.

ALIGNMENT
---------
HINTS:-
1. Be VERY careful with all the coils as they are filled with wax. Use a
   soldering iron to soften the wax before ajusting.

2. RV101 alters the S meter reading, and RV303 the deviation, you MAY find it
   necessary to mess about with these TO SET UP THE TX/RX, but MAKE A NOTE OF
   THEIR SETTING and put them back as they were after the rig is set up.

3. DON'T FORGET TO TX ON A DUMMY LOAD.

4. Put a meter (10 volt range) +Ve lead on pin 8 (lock detector pin) of
   IC201, negative to ground, and tune the VCO coil T202. This coil is common
   to both RX and Tx) Wind the core down until 5 volts is achieved on both RX
   and TX. Hint:- Have another 10m set without an antenna tuned to 29.600
   near to the CB, and have the CB TXing on channel 25 while you ajust it for
   maximum carrier on the 10m set. Then, still monitoring the carrier as
   described above, tune coils T207, T208, T209, T301, T302, T305 & T307 for
   max. output.

5. Now swop the 2 sets (and dummy load) and put the 10m set on low power TX
   while you tune coils T101,T102 & T103 on the CB for best signal.

NB. It is now no longer a CB, so get your morse passed!

G4XGN

(Downloaded from GB7SYP)