[Elecraft] K1 10m band / 28 MHz (low-side injection / VFO added to Premix)

[r j]

I am going to make a quick 10m module for the upcoming contest. In
https://www.mail-archive.com/elecraft@mailman.qth.net/msg17837.html there
are two frequency schemes for a 10m band for K1. They require crystals for
appr. 33MHz or 26MHz.

I have a "junk box parts" home brew K1 receiver with IF 5MHz (on an
original K1 RF PCB that I got hold of). I only have 20MHz crystals at hand
for the 10m filter module, and must have it working in a week's time. By
using low-side injection and VFO added to premix, I get 28Mhz RF - 5MHz IF
= 23 MHz LO (low-side injection). By using the added product of VFO ca.
3MHZ and XO 20 MHz, I get the needed 23 MHZ low-side injection for the
receiver mixer.

Apart from having to make a 23 MHz BPF for the premix (that might be
marginally less stable in frequency than one will achieve by using 26MHz
and VFO subtraction), is there any other significant issues with this
method (in addition - of course - to LP and BP rf filters for 28 MHz).

Thanks.

Roy
RF Tinkerer