[Elecraft] K2 Band Data

[Jack Brindle]

As far as I know, the transceivers have Auxbus (K2, K3, K4, but not K1). Not sure if the KX transceivers bring it out to a connector, though.
The KPA500 sends data out to the transceiver using Auxbus, but does not listen, the KAT500 only receives data. The KPA1500 does both.

I believe you are using the TXBPF filters, Jim (as am I). They need low-drive individual band signals, although they also can use the K3’s 
BAND outputs.

I hope this answers the question…

73,
Jack, W6FB



> On Sep 2, 2023, at 1:07 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> On 9/1/2023 7:21 PM, Michael Carter wrote:
>> One clarification on the AUXBUS signal: the
>> 'auxbus' is Elecraft's proprietary 1-wire
>> signaling scheme by which the main MCU
>> on the K2 Control board talks to all of the
>> other controller ICs on the various option
>> modules and the I/O controller (relay driver,
>> among other functions) on the K2 RF board.
>> The 'auxbus' signal is made available via the
>> KIO2 interface, if installed, for use with
>> external Elecraft modules (e.g. the KAT100
>> ATU, KPA100 PA, and the transverter modules).
> 
> One caution -- I was told by someone at Elecraft years ago that not all later products implement it. I think I remember KAT500 and/or KPA500. I'm using Auxbus from K3s KRC2s to generate band data to switch bandpass filters. Very nice - a single coax from K3 to KRC2. I don't remember what format the filters wanted. That was W6FB's project, I think.
> 
> 73, Jim K9YC
> 
> 
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