Posted by
Guy, K2AV on
Mar 28, 2009; 3:15pm
URL: http://elecraft.85.s1.nabble.com/K3-Beta-firmware-Rev-3-04-AGC-fixed-various-improvements-tp2540723p2549374.html
Crossband A/B was quite worse in one of the early band independence beta's
and issues were reported to Elecraft. Somewhere in there Wayne cleaned up
some artifacts in the switch (e.g. could hear the oscillator settle in) and
significantly tightened the times -- the pause currently appears to be quite
short.
Rig has to flip a lot of data and settle a lot of circuit states in an A/B
crossband switch. But there is a clearly longer pause to RX when one does a
straight band change. It is interesting that noone has reported the pause
for band change, as if we clearly expect that.
Just went through and rechecked and remeasured all the timings in firmware
3.04. Using Spectrogram 15 audio breaks show up very clearly and can be
measured. The pauses are consistent for the kind of switching done.
On my K3 #1239 an A/B crossband switch (80/40) creates an audio pause of 230
milliseconds. A straight band change on the other hand (which moves the
main RX/TX but leaves the sub RX where it was) creates an audio pause of
700 milliseconds.
As you report, an inband switch does not cause a pause, with nothing
detectable on Spectrogram.
73, Guy.
----- Original Message -----
From: "ab2tc" <
[hidden email]>
To: <
[hidden email]>
Sent: Friday, March 27, 2009 6:14 PM
Subject: Re: [Elecraft] K3 Beta firmware Rev. 3.04: AGC fixed; various
improvements
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