UX-910
Note: use a small insulated alignment stick to make these adjustments. The controls are tiny, and
if shorted to ground or to another component, will damage the circuit. The first control is especially
susceptible, as it is very close to a coil shield.
1.
Turn off the radio and remove the top and bottom covers. If you have the UX-910 module
installed, remove it in order to make the 144 and 430 band adjustments possible. It's easy,
there are just 4 screws holding it in place, and 3 connectors to unplug. Set it aside until
you are ready to make the 23cm adjustments.
2.
Turn the radio on.
3.
Refer to page 5-5 of the service manual, and find R547 and R360. Adjust these controls for
max receiver gain on 144 (main band). Then switch 144 to the sub band and adjust R857
for max receiver gain on the sub band.
4.
Switch 430 to the main band and refer to page 5-7. Adjust R61 for max receiver gain on
430.
5.
Turn the radio off.
6.
Reinstall the UX-910 23cm module. Remove the cover plate on the UX-910 and set it aside.
7.
Turn the radio on.
8.
Set the main band to 1296.1 Mhz USB, and connect a proper dummy load to the antenna
terminal. Refer to page 5-19 and adjust R224 for max gain. On my unit, I was actually able
to adjust the gain too high, as the s-meter was reading about s3 on background noise. I
backed off the gain until the meter dropped just below s1, you may have to do the same.
9.
This last adjustment is for the overall transmitter gain on 1296, and I adjusted this
because I found that I did not have sufficient ALC action when on SSB, even with the mic
gain all the way up. I turned up R83 to correct this...you may or may not need to do the
same.
10.
Turn off the radio, reinstall the UX-910 cover and the top and bottom covers of the radio.
All done!
Summary of Contents for IC-910H
Page 2: ...144 R360 R857 430 R61...
