[Elecraft] K3 VFO tuning hash

[Toby Deinhardt]

Hi John and the List,

 > What I've discovered and reported to factory tech support is a very
 > noticable hash noise while in the receive mode with any bandwidth
 > centered around 28.000 MHz to 28.050 MHz.  And, it is also present
 > while tuning RIT.

I noticed something like this after adding the secondary receiver to my 
K3 many months ago.

At least in my case, the actual physical layout (routing) of the cables 
to and from the synthesizers, the reference and the receivers turned out 
to be critical and rather touchy. After a fair amount of fiddling I 
managed to reduce the hash to a point where it was below the noise level 
from the antenna on a quite, inactive band.

Apparently something was coupling into and then elsewhere out of the 
shields of the coax wiring around the synthesizers. If I remember 
correctly, the smallish knob for the secondary RX was worse than the big 
main knob, and when the two receivers were tracking the hash was much 
stronger then when they weren't

Because I do not do 5MHz or 50MHz, I can't really comment about these bands.

vy 73 de toby
-- 
DD5FZ (ex 4n6fz, dj7mgq, dg5mgq, dd5fz)
K2 #885, K2/100 #3248, K3/100 #67
DOK C12, BCC, DL-QRP-AG