Snip
Martin wrote:
>...I built a 4-band board for 40/30/20/15 and a two band board
>for 80/40m
Hi Martin,
Is your frequency of operation on 40m accurately shown on the LCD for
*both*
filter boards?
The problem with having the same band on two different filter boards is
that
the K1 front panel MCU can only store *one* display calibration constant
for
each HF ham band (as set using the OPF function). The calibration constant
is not stored in the filter board MCU. Unless the hetrodyne crystal
oscillators for that duplicated band on both filter boards operate at the
same frequency, the LCD frequency display for that band will be inaccurate
for the filter board which was not installed at the time of the OPF
frequency display calibration. Judging by three Elecraft 40m hetrodyne
crystals I've tried, the variation between crystals can be several kHz.
The effects of hetrodyne oscillator frequency variations do *not*
automatically show up on the K1 LCD frequency display. The LCD display is
driven by a frequency counter program in the front panel MCU that senses
*only* the raw output of the VFO before it is mixed with any other
oscillators in the K1.
73,
Mike / KK5F
Snip
You are quite right Mike, the frequency calibration is only correct for one
of the boards but the error seems to be fairly small (as you say it depends
on the frequency difference of the crystals) and doesn't bother me. I just
keep away from the band edges hi.
Martin
M0KWV
K1 #1534
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