On Sun, May 19, 2013 at 9:21 PM, James C. Hall, MD <heart...@nwtcc.com> wrote: > > > Sent from my iPad > > Begin forwarded message: > >> From: "James C. Hall, MD" <heart...@nwtcc.com> >> Date: May 19, 2013, 11:20:00 PM CDT >> To: "elecraft...@yahoogroups.com" <elecraft...@yahoogroups.com> >> Subject: Band decoding with TXBPF's >> >> Hello: >> >> For Field Day I'm planning on using the AUX I/O band data pins to feed the >> built-in band decoder of the TXBPF's I built a couple years ago. I won't be >> using the output of this decoder for antenna switching - just band following >> with the BPF's. I'll be utilizing an older Microkeyer for digital operations >> and this uses the AUX I/O for FSK and PTT. >> >> Looking back in the archives, I presume I will need a DB15 Y-cable which I >> see Elecraft sells and I presume ABCD on the TXBPF 5-pin DIN is the same as >> 0123 on the AUX I/O DB-15. I just need to make up this interface cable.
>> One other thing - my K3 is serial number 616, so I have the KIO3 board >> without the pull up resistors. This is more specific to the TXBPF, but does >> this unit need those resistors; that is, do I need the upgraded KIO3 board ? Which TXBPFs? If it's the 5B4AGN kit, the schematic for his band-decoder shows 10k pullups on the band data inputs, so you should be fine. I recently acquired an already-built 5B4AGN unit, but haven't gotten around to interfacing it to my K3 yet. 73, ~iain / N6ML ______________________________________________________________ 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