[Elecraft] K3 Beta firmware Rev. 3.04: Crossband A/B switch audio pause

[Guy Olinger, K2AV]

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" <ab2tc at arrl.net>
To: <elecraft at mailman.qth.net>
Sent: Friday, March 27, 2009 6:14 PM
Subject: Re: [Elecraft] K3 Beta firmware Rev. 3.04: AGC fixed; various 
improvements


>
> Hi Wayne,
>
> Another minor quirk to report regarding the cross band A/B switching. If
> the B VFO is on another band, pressing the A->B button causes a minor
> pause in the audio. No relays clicking but a definite pause in the
> audio. No big deal at all, but when A and B are on the same band, this
> does not occur.
>
> Knut - AB2TC
>
> wayne burdick (via Nabble) wrote:
>> Guess I forgot that it didn't work right before :)
>>
>> Have fun--
>>
>> Wayne
>> N6KR
>>
>> ab2tc wrote:
>>
>> > I just made the upgrade to 3.04 after a long period of skipping
>> > upgrades. I am very happy to report that the A/B VFO switch now works
>> > across bands *without* having the sub-receiver. I am not sure why
>> > Elecraft has been so reluctant to announce this...
>>
>>
>> ---
>>
>> http://www.elecraft.com
>>
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>
>
> -----
> AB2TC - Knut
> -- 
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