Subject:Extended frequency rx and tx of the ALR22T



ALR22HT ALINCO 2 METER RADIOS

BEWARE OF ANY STATIC WHEN WORKING WITH THIS RADIO !!!


1. Remove the top and bottom covers of the radio.
2. Remove the 4 screws that hold the front panel assembly to the main chassis.
3. Pull front panel away from the main chassis very gently.
4. Locate the Volume\Squelch pot on the left side of the radio.
5. Locate the VFO control on the left side of the radio.
6. Between the two above units is an IC that runs vertically between the two units only the 12 pins of the ic are seen from the back.
7. After locating the IC locate 3 sets of unsoldered jumper pads between the IC pins  8 Make a solder bridge between the top 2 pads,then the middle 2 pads,then between the bottom 2 ONLY of the bottom set of 3 pads.

REAR VIEW OF FRONT PANEL / ------\ 12 PIN O * O /---------\ / VOLUME \ IC |

solder BRIDGE / \ / CONTROL \ O * O / \ / \ / VFO \ \ / O * O \ CONTROL / \ / | SOLDER BRIDGE \ / \-----/ O * O \--------/ O * O * DO NOT SOLDER THE TOP PAD O | O OF THESE 3 PADS * \SOLDER BRIDGE HERE 9 RE-ASSEMBLE RADIO 10 RESET MICROPROCESSOR 11 This mod will extend the RX range as well as the TX range of the above unit.The display will have a range from 29mhz to 299 mhz but this is just an erroneos display as the PLL on a typical radio will rx between 130 mhz and 180mhz with a TX range that may be a little beyond these these frequencies  GOOD LUCK AND HAPPY MODING 73 CARL Packet:VE3ZCO@VE3GYQ Internet:VE3ZCO@ardsley.business.uwo.ca CARL VE3ZCO 44.135.80.8