Hardware Hacking

AMC Modification

Add a 8.2KOhm in series with R249 and a 1KOhm resistor across D92 to give more AMC adjustment range.

Super-talk

Lift leg of R-238. Insert a 1N4745 Zener Diode (a 16V, 1 W type), band side up.

Solder the Zener diode to the PCB.
Next, solder the resistor lead you lifted from the PCB to the banded end of the Zener diode.
DOING THIS WILL GIVE YOU FULL MODULATION SWING AT LOW POWER.
PLUS, IT GREATLY INCREASES YOUR RMS WATTS TOO. Stabilise Talk BackBridge C-155/R-207 junction to the C-187/R-235 junction with a 470K resistor.
THIS WILL DO AWAY WIYH FADING IN AND OUT, PLUS TAKE AWAY ANY SQUEEL IN THE TALK-BACK YOU MAY HAVE.
YOU CAN CHANGE THE LOUDNESS BY CHANGING THE RESISTANCE THE 470K PROVIDES GOOD LOUD TALKBACK.

Channel Expansion Version 1

1) Open up your radio.
2) Find the small circuit board on the left of the radio.
3) Cut the (usually) green wire and tape it off.
4) There is an unplugged connector by this board….plug it in.
5) Near the front of the radio there is a connector marked +10K. Reconnect the plug to the board.
6) That’s it.!You now have 8 bands of 40 channels.25.165-28.755.

Channel Expansion Version 2 (more detailed, but the same)

Remove the bottom cover.
On the left side of the radio (Front panel facing you) look for a red wire on the small pc board. (foil side up)
Unsolder this wire at both ends and dispose of it.
Be certain that the solder pads, from which the wire was removed, are soldered correctly.
Remove the screw holding the board onto the chassis.
On the top side of that board (component side-which was down) there is a row of pins with nothing plugged into it.
There will be a matching plug close by that is lying loose.
Plug it onto the row of pins and replace the screw holding the board to the chassis.
Near the front of the main pc board there will be a small 3 pin plug lying loose.
Plug it on to the matching pins located next to the channel board.
The radio will now work on the C. B. band.

Tweaks

Audio Limiter – R249
AM Power – VR13

Here is a little trick I found for the galaxy FC148 frequency counter to work on the galaxy 33 that has been modified for CB channels.

Remove the pc board from the case.
Remove the metal cover on the pc board.
Remove the jumper at JP and reasemble.
Now it will plug in and work like it is suppose to on the galaxy 33
(I dont know about the other plug in models as this is the only one I have messed with)

Adjustments

VR 1….AM/FM S-Meter

VR 2….SSB S-Meter.

VR 3….SSB Squelch Range

VR 4….AM/FM Squelch Range.

VR 7….SSB Carrier Balance

VR 8….RF Meter 7.VR11…Driver Bias.

VR12…SSB ALC

VR13…Hi Power.

VR14…AMC

VR15…AM Low Power.

VR16…SSB Low Power.

VC 1….10.240

VC 2….10.240

Channel Expansion Version 1

Remove the top cover.

Just above the PLL you will find a jumper block.

There is only one jumper on this block..Move the jumper from bottom left position to top right position.

I have been informed by a visitor to my site that it is possible to get coverage from 26.000 Mhz – 31.999 Mhz buy adding another jumper instead of moving it.

Just add the jumper between pins 2 and 3, leave the other jumper on pins 4 and 5.

Channel Expansion Version 2

Remove the top cover.
Near the front of the radio located behind the display will be a black jumper block next to two pins that have nothing on them.
Another black jumper block comes with the radio and will be in the accessories package.
Slide it over the 2 pins that are not covered and the unit will operate from 26.000 mhz to 32.000 mhz