Dave, This is the old WAOF (wierd at one frequency) situation. If you have it, it will be found near 7167 kHz. It is most noticible on receive but it affects the transmitted signal too.
Reduce the lead length of everything that you can find in the general area of the VCO and PLL - even flush cut the IC leads. If you mounted the ICs in sockets (contrary to Elecraft's instructions), then remove the sockets and solder in the ICs directly on the board. Make all leads as short as possible to minimize the leads acting like tiny antennas. 73, Don W3FPR > -----Original Message----- > > When I operate my K2 between 7180 and 7190 Khz the VCO seems to worble or > becomes unstable. Any other band or frequency is fine. I have > removed RFC15 > and replaced it with a direct wire connection then later a ferrite bead. > C91's value was increased from .001 uf to .01 uf. c*88 is still 68pf but > with the advice of Elecraft Technical support I reduced the lead > length of > this component to as short as possable. These changes seem to > help reduce > the bandwidth of instablity but not totally eliminate it. > > The rig works fine on all bands and puts out 10+ watts. > Any suggestions > > 73 > Dave KD1NA > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.15/581 - Release Date: 12/9/2006 3:41 PM _______________________________________________ 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
