[Elecraft] Strange behavior when tuning around with SUB receiver LINKED

[William Evans]

James,
I, too, have noticed what I believe you are noticing.  It seems to me  
that the jumps in the tracking of VFO A and VFO B occur at the  
transitions of the bandpass filters.  It is as if when the bandpass  
relays switch, the VFOs lose their synchronization. (Of course, I  
could be wrong, but it seems that way to me)  I tried to discover the  
repeatable conditions for its occurrence, but other than quickly  
tuning the main VFO knob over large excursions of frequency with  
linked VFOs, I could not discover any real reason for the occurrence.

Concerning the motorboat zipper noise, I have 8 pole filters in both  
the main and sub receivers, but they are evidently not exactly  
matched.  When I tune quickly, the phase difference between the two  
receivers, due to the tuning delays in the VCOs kicks in and causes  
the motorboating.  As soon as I stop tuning, the phase differences  
come back into sync (or nearly so) and I do not have the  
motorboating.  Now if there is a tutorial which describes how to find  
the actual offset of the 8 pole filters out there, we could find the  
offsets and adjust them accordingly, and be rid of that problem.

That is my diagnosis, and I'm sticking to it (at least until the true  
reasons are discovered.)

Bill
W4ISH -- With my call, you only have to know half the Morse Code --  
Just the Dits.