echristley(at)nc.rr.com
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 Posted: Thu Sep 20, 2007 7:07 pm Post subject: Icom A200 Dimmer |
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It took a little experimentation, but I got it done and thought the
information might help someone else.
Dimming the backlight of the Icom A200:
The installation manual for the Icom A200 indicates a lead to supply
+12V for the panel backlight, and another for the backlight's ground.
Using an ohmeter, the indicated ground is tied to all the other
grounds. The backlight will work without that lead being grounded. At
least it did for me.
I passed the +12V through an ON-OFF-ON switch and then to a bus
controlled by the marker light switch. I tied the two ON contacts of
the switch together with a 15 ohm, 1/2 watt resistor. The backlight now
comes on with the marker lights (ie, at night), and is full bright with
the switch up. With the switch down, current has to pass through the
resistor and the backlight is about half as bright. I could have used
and ON-ON switch, but I didn't have one on the shelf. This way I have
more (albeit, useless) options. 8*)
Icom seems to have changed their backlighting scheme over time, but I
bought mine only a few weeks ago. As of August 2007, a 15ohm resistor
in series with the power supply is sufficient to drop the backlight to
half brightness.
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