[Elecraft] K3: Band Data (renamed)

[G3SJJ]

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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