Oh dear, you have made me a little worried now Ian.
I use two Topten Band Decoders, with new source driver boards. Each one
has a cable wired for Yeasu, ie terminated in a Din plug which goes into
the Band Data out socket on the FT1kMP. One also has a twin screened
lead which picks up Amp Keying and Inhibit for my Acom 1000 amp. I am
not too worried about the Inhibit, as per recent discussions, I wired it
in since it was available and I use short time constant on switching.
I was just going to rewire one cable into the 15 way D connector to pick
up band data. I need 20mA switching capablity for the Acom so was
proposing to use normal phono to phono plus take 12v off the rear K3
connector. A bit messy compared with just a single Din connector on the
MP but now it seems I will need some other kind of interface as well.
Chris G3SJJ
Ian White GM3SEK wrote:
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.
Whether or not any of those interface facilities is "really needed" is
a side issue. Those interfaces exist in the K3, so the relevant
discussion is about compatibility with users' existing stations.
At the technical level, these are all fairly trivial problems. My
holiday project was already going to be a breakout box for the 15-way
cable from the ACC connector, where the interfaces with several
different parts of the station can be patched in. The inverters and
level shifters that will be needed to give the K3 an industry-standard
interface to the outside world can go in there. It's just a little
more work than anyone would really have wanted.
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