METHOD ONE:
~~~~~~ PLL Conversion ~~~~~~
1)Locate IC-7 and IC-5.(There near the PLL chip)
The Results
If all is done right SWITCH 1 will give you:
Then you can use SWITCH 2 with SWITCH 1
~~~~~~ Crystal Conversion ~~~~~~
1)Find the 14.550 MHZ crystal in the radio.
2)Found them??...Good! Lets start with IC-7
3)Cut the trace going to PIN #2.
4)With a SPST switch (We'll call this switch 1) solder both sides of the cut trace to each leg of the switch.
5)Now on IC-5 cut the trace going to PIN #12.
6)With another SPST switch (We'll call this switch 2) solder both sides of the cut trace to each leg of the switch.
7)Now mount the 2 switches somewhere in the radio.
25.425 - 25.865 MHZ on channels 1 to 40 on Band 'A'
25.875 - 26.045 MHZ on channels 1 to 15 on Band 'B'
25.295 - 25.415 MHZ on channels 16 to 27.on band 'A'
The other 'Bands' are not affected with this mod.
2)You can change this crystal to 15.450 and get 26.965 - 29.185 MHZ.
3)You can change this crystal to 15.000 and get 26.515 - 28.745 MHZ.
(By +/- .450 MHZ to the crystal you can move up/down a full band.)
AM POWER - ????
SSB POWER - Cut TR-37
~~~~~~ AGC Modification for SSB ~~~~~~
1)Change R-43 (10k ohms) to 1k ohm. Now strong SSB signals should be clear and not distorted.
~~~~~~ Roger Beep delay ~~~~~~
1)Remove R-168 (47k ohms) and install a 56k ohm.
~~~~~~ Talk Back ~~~~~~
1)Cut D-71.
2)Change R-41 (150 ohms) to 270 ohms.
3)Change R-47 (1.50kohms) to 3.9k ohms.
4)Remove capacitor C-31.
2)Solder a wire from PIN 1 of IC UPC-1242H (audio chip) to PIN 2 of the mic socket.
3)IF...the talk back is to loud then install a 100 -500 ohm resistor in series to the mic socket.
4)IF...the receive audio drops then install a .01 uF ceramic disk capacitor in series to the mic socket.
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