Thanks for the info, I think the other ham that asked Wayne, was me...
:) I don't need absolute accuracy, I just wanted no steps is all... I
will go pick up an older Icom, or something along that line. I had a
Pro III and it worked for my application, watching short term changes in
the Ionosphere. Even had I know the K3 was not capable of doing this, I
would have still purchased it. As you intimated, the right tool for the
right job.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 6/6/20 6:48 PM, Wes wrote:
All synthesized radios tune in steps. The difference between them is
some are smaller steps than others. Eleven years ago I offered a fourth
method for calibrating the reference frequency in a K3. (I suspect, but
do not know that the K3S is different.) See:
http://elecraft.365791.n2.nabble.com/Ref-Osc-Cal-Method-4-td2595451.html
After reading about my observations another ham queried Wayne and he
responded with an explanation of the frequency generation in the K3.
Once again, I don't whether this applies to the K3S. Perhaps Wayne will
let us know. Nevertheless, the tuning step sizes are different for
different bands with the higher bands having greater step sizes, i.e.
less accuracy. I-F BW/Shift requires changing oscillator frequencies at
I-F ("BFO") with commensurate changes in the LO. Since the LO has
different step sizes on different bands, changes in the beat note (that
I observed) do occur.
The K3(S) is a great transceiver, it isn't a great frequency meter.
Wes N7WS
On 6/6/2020 2:42 PM, Dave Cole wrote:
Hi,
As the other station siad, you will have Doppler issues. Also the K3
tunes in steps, which make sustained .1 hz accuracy a dream, not
attainable. It looks to tune in .25 Hz., or larger steps. I am going
from memory here, so it may be something different.
I wanted to use my K3 to watch Ionospheric shifting, via Doppler
shifts, from WWV. I am unable to as a result of the method Elecraft
chose for tuning.
I have the TXCO, and that just provides a reference for the radio, it
does not make the steps go away...
I was quite disappointed when I discovered this, but, the good stuff
in the rest of the radio makes up for that small loss. I'll buy some
stable rig that uses analog tuning.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
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