Hi Jerry, I had forgotten about the KRC2, Elecraft's universal band decoder/relay driver unit, so thanks to Jack, W6FB for reminding us.
The K2 uses five separate filter sections (both for bandpass and lowpass selection), and these do double duty for adjacent ham bands. From my brief inspection of the W6PQL Low Pass Filter design, it should be possible to decode the K2 filter relay driver signals and design an appropriate converter to create the Yaesu 4-bit band encoding. A microcontroller may be overkill, but certainly more forgiving than a pure hardware encoder if you don't get it right the first time. 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). The KIO2 module does provide RS-232 serial bidirectional communication for rig control/status monitoring, and it is possible to write your own monitoring application that infers band data from the KIO2 data stream. If you go this route, be sure NOT to use a standard RS-232 cable, but DO wire the special cable spelled out in the KIO2 manual. The KIO2 programmers' reference manual is available on the Elecraft support pages. The pin labeled 'AuxBus' on the Aux. I/O port of the KIO2 is indeed the proprietary signaling scheme used by Elecraft, and would require more in-circuit data capture while exercising the various option controls to enable reverse engineering of the protocol. It is not publicly documented to my knowledge, so the KIO2 RS-232 data channel is probably the preferred way to accomplish your objective. 73, Mike, K8CN ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
