[Elecraft] K1 tuning rate... is 150 kHz too wide?

[Mike Morrow]

A compromise configuration is possible that makes tuning less cramped on the low end of a band on a K1 that has been built for 170 kHz VFO span:

(1)  On the 30m band filter board, use the 18.1 MHz hetrodyne crystal (normally installed when a 80 kHz VFO span is used) instead of the specified 18.0 MHz unit.  Both crystals are supplied with filter board kits.  This will cause 10.1 MHz to be the low end of VFO tuning instead of 10.0 MHz.
(2)  Solder another 100 kohm resistor in parallel with R19 at the VFO pot terminals, for an effective resistance of 50 kohm at R19.  This will alter the linearity of VFO tuning such that the kHz per turn will typically be about 13 kHz per turn at the low end of the band, while at the high end of the band tuning will be more than 22 kHz per turn.

This will result in spreading out the CW band at the low end where most activity is, and cramping it at the high end where only occasional CW operation will likely take place.

However, I personally don't use this configuration because I want to be able to receive WWV at 10 MHz, and I like the nearly linear tuning rate.

73,
Mike / KK5F