Author: Dan, KC8LQA
I have found some mods for the Alinco
DJ-280 which I have found to work well. I have not yet tried
everything yet and it is up to you to do what a ham does best
"tinker".
First remove the battery and battery
contact plate on the bottom of the radio.
Second remove the 3 screws on the radio
case, 2 on the back next to the PTT and 1 on the front next to the
lanyard hole. There is no need to remove the belt clip or the
plate under the belt clip.
Three remove the squelch knob and the
off/vol knob, take of the front half of the case
(be careful there are 2 small wiring
harnesses between the 2 halves of the case)
by swinging the bottom out and lifting up.
Then unclip the 2 wiring harnesses, 1 from the speaker and the
other from the keypad.
Now looking at the board you will see 5
solder jumper spots on the left side of the radio. Two of the on
the top going horizontal, and three jumpers going vertical. The 3
going vertical are the ones to use, I have not worked with the
other two yet.
I have solder blobs on TRX and TX, which
gives me the standard US band plan TX 222 Mhz- 224.995 Mhz.
Which is model DJ-280T
TX jumper CLOSED
RX jumper OPEN
TRX jumper CLOSED
By opening the TRX jumper and closing the
RX jumper it will now work on 220 Mhz- 239.995 Mhz. Which is model
DJ-280TA1
TX jumper CLOSED
RX jumper CLOSED
TRX jumper OPEN
By closing all jumper it will work on 240
Mhz- 259.995 Mhz. Which is model DJ-280TA2
TX jumper CLOSED
RX jumper CLOSED
TRX jumper CLOSED
73, KC8LQA
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KB2LJJ
