[Elecraft] Another K1 10 meter project

[Bill Cunningham K4KSR]

I'm launched on experiment to put K1 on 10 meters -- using 26.170 MHz xtal
at Wayne's suggestion (and generous contribution).  This should make the
whole project easier with lower frequency crystal and more premix output,
but I've run  into a snag and seek some advice.

Instrumentation here is pretty crude -- RF probe and HF receiver.  RF probe
uses 1N914 vice 1N34A and that makes a difference in readings for  low level
signals.  10 meter filters are built as Band 1 on a KFL1-2 board with 80
meters working like gangbusters as Band 1, my basis for comparison -- 
acknowledging potential difference in freq response for the probe.  The
premix filter is same as for 17 meters,  peaks nicely and right mixing
product verified with HF receiver.  Bandpass filter and RF board mods follow
design by Stephanie Maks, VA3UXB.  This includes change to R11 on RF board
and absence of L-section at output of BPF.  For now, the output filter is
jumpered across - just seeking raw output into dummy load.  Best I can
achieve is a hair under 200 mW output. That level does peak with slugs in L7
and L8 very near all the way down.   No problem hearing low level 10 meter
signal generated in shack.

Signal is dying either within the BPF or from mismatch at its output.
Comparison with 80 meters yields 1.06 volts at test point TR1 for 10 meters
vs 0.28  volts for 80 meters. The 80 meter signal drops to 150 mV at test
point BPF, but the 10 meter signal drops like a stone to 16 mV at the same
point, so difference in RF probe freq response cannot be an issue.  I'm
stumped over great difference from Stephanie's results.  Caps in the
bandpass filter are high quality from Elecraft. My only immediate source for
filter changes, however, is limited to Radio Shack - grand variety and
questionable quality.

Anybody else been down this path and have ideas?

Bill Cunningham
K4KSR