LCD Question

[k6dgw]

On 7/30/06, [hidden email]:

 > the LCD on the front panel board. The LCD that came with my kit
 > has the clear strip mentioned on the front (display) side, but
 > on the back side it has an opaque strip with no markings on it.
 > Should this opaque strip be removed or left in place?

LCD's operate by ambient light (or a so-called backlight) passing
through the LC cells, reflecting off a back layer (which polarizes the
light), and then back out through the LC cells.  The cells either pass
of block the light by twisting their preferred polarization, forming the
characters.  If you remove that reflective layer, it will cease to work.
  I can't remember my K2 LCD real well, but I don't remember having any
problem knowing what to peel off.  I think there was a thin protective
film on the front and a somewhat thicker tape-like material on the back.
  I left that on.

Hope this helps,

Fred K6DGW
Auburn CA
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[n1ix]

I just finished my KX-1. I am not sure if I have problems or not. The output
power into a dummy load is only 2 watts. I completed the power mod replacing
resistors R11 and R30 which made little or any difference. Also the receiver
sensitivity seems noticeably better on 40 meters. Any comments?

Dave N1IX



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[Don Wilhelm-3]

Dave,

If your power supply is 13.8 volts, you can expect more power output than
that.  Check into a known good 50 ohm dummy load with the tuner removed and
the jumper in place.

If you still have problems, check T1 and the Low Pass Filter (L1 and L2 and
associated capacitors) for proper winding, good lead stripping, and proper
values.

A typical KX1 will provide almost 4 watts out on 40 meters and about 3.5
watts on 20, but anywhere in the range of 3 to 4 watts is the specification,
so if you can get both bands above 3 watts, it passes.

The receiver sensitivity is not related to the transmit problem unless you
have a gross error in the Low Pass Filter - differnt circuits are used for
transmit than those for receive (the trimmers are only for the receiver
front end tuning, not transmit).

73,
Don W3FPR

> -----Original Message-----
>
> I just finished my KX-1. I am not sure if I have problems or not.
> The output
> power into a dummy load is only 2 watts. I completed the power
> mod replacing
> resistors R11 and R30 which made little or any difference. Also
> the receiver
> sensitivity seems noticeably better on 40 meters. Any comments?
>
> Dave N1IX
>
>
>
> _______________________________________________
> Elecraft mailing list
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> You must be a subscriber to post to the list.
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