Elecraft K1 owners who sometimes operate under low light conditions can
now add backlighting to the rig's display. A kit containing all needed
parts is available, priced at $19.95 (model K1BKLTKIT). Here's what the
K1 looks like with the backlight installed:
www.elecraft.com/K1/K1_backlight_detail.jpg
We've found this to be a nice addition to rig, especially for camping
trips and late-night Field Day operations.
The backlight kit includes a replacement LCD (transflective),
rectangular backlight LED (same color as the K2's), diffuser, and two
current-setting resistors for your choice of 6 or 10 mA backlight
current. The kit can be used with any K1. If you haven't yet built your
K1, you'll end up an extra LCD, which you can keep as a spare.
If your K1 is already built, you'll need to remove the existing LCD in
order to install the backlight. Since we supply a new LCD with the kit,
the old LCD can be removed by clipping its pins, then heating and
removing them one at a time. This is quite easy to do, thanks to the
well-illustrated instruction sheet written by Tom Hammond, N0SS.
ON/OFF Control
The backlight draws only 6 to 10 mA, but you can add on/off control if
desired. One possibility is to use a switch mounted on the left side
panel. However, since most K1 owners never turn off AGC, it may be
preferable to use the AGC menu entry to control the backlight. To do
this: (1) cut the RF board trace running from pin 8 of J6 to C31; (2)
add a jumper on the bottom of the RF board from J6 pin 8 to P1 pin 18;
(3) use another jumper to connect the cathode (K) lead of the backlight
LED to pin 18 of J1 on the front panel board.
73,
Wayne
N6KR
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