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 Why not take a look at our Web site? http://www.simoncarves.com ************************************************************************* The information in this email and any attachments may contain privileged and/or confidential information intended solely for the use of the individual or entity to whom it is addressed. If the reader of this email is not the intended addressee, or the employee or agent responsible to deliver it to the addressee, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify me by telephone or email and delete all copies immediately. ************************************************************************* _______________________________________________ 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
