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
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