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 _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
