Some KX1s have slightly lower transmitter output than others. When
using a 14V supply, the output may be as low as 2.5 to 3 watts across
all bands instead of the expected 3 to 4 watts. When using the internal
battery the output maybe as low as 0.75 to 1 watt instead of he
expected 1 to 1.5 watts.
Some builders have noticed this effect only after installing the
KXB3080 option (30/80 meter module). The low-pass filter module
supplied with the KXB3080 has slightly different characteristics from
the original, which is necessary to obtain coverage of all four bands.
If you think your KX1's output is on the low side, for whatever reason,
you can order our model #KX1PWRMODKT at no charge. It's listed at the
bottom of our Parts and Mod Kits page:
http://www.elecraft.com/order_form_parts.htm
The mod kit provides two resistors and instructions, and the change is
easy to make. If you have your own stash of resistors, you can just
download the application note at:
http://www.elecraft.com/manual/
E740099%20KX1%20Application%20Note%20Rev%20A.pdf
NOTE: We don't recommend making the change if your KX1 already puts out
4 watts or more on some bands. While it's generally safe to operate the
KX1 at 5 watts, the design was optimized at the 4-watt level to provide
plenty of safety margin in terms of RFI, current drain, and heat
sinking via the top cover.
73,
Wayne
N6KR
---
http://www.elecraft.com
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