At 10:32 AM 12/3/2007, Ian White GM3SEK wrote:
<SNIP>The problem was simply that, on the issue of compatibility with
existing technical standards in the market, nobody picked up the ball.
<SNIP>
3. Reverse logic in the band data output. Again, this 4-bit encoding
was originated by Yaesu, and has since been adopted and extended by
a range of third-party providers. The standard band data output is
TTL, logic 1 = 5V, logic 0 = 0V.
The K3 uses industry-standard band encoding, but the output
interface is not standard. Use of open-drain pulldowns in the K3
means that existing non-Elecraft band data interfaces will not work
without some modifications and a user-provided positive supply rail.
Thanks for mentioning this, Ian. I hadn't picked up on this before.
One of the major reasons I ordered a K3 was because I assumed the
automatic band selection feature on my Quadra would work directly
with the K3 after I wired up a new cable.
I am presently using a method in which my PC reads the rig freq and
generates band-data signals for the amp (
http://www.ab4oj.com/quadra/w4uk.html or
http://mywebpages.comcast.net/rwilliams309/QUADRA_interface.html ).
This works OK, but always requires the logging computer is on and
that the program is running.
Are there any existing devices that would work with the K3 band-data
interface as-is? Anybody know of such?
Ian, if this is fixable within the K3, will it require a hardware
change or can it simply be inverted in software?
Jerry W4UK
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