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I have not opened mine up yet, but in looking at this I found a typo
in the App Note....
it says "Locate resistor R30 on the bottom of the board between
trimmer pot R30".... should that be R4?
Randy Rathbun NV0U
[EMAIL PROTECTED]
K2#1981, kx1 #1318, ARS #895, QRPARCI #10776, FP#1292, KCQRP #1
On Apr 5, 2006, at 6:07PM, wayne burdick wrote:
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
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http://www.elecraft.com
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