[Elecraft] K3 Band Decoder

[K3KO]

The poor man's solution is a CD4514 IC, some diodes and resistors.  It will
decode all 11 bands and run off the K3 +12v jack.  Diodes allow for handling
multiband antennas. 

Personally, I prefer a cheap PIC but you have to have the programmer.
73 de Brian/K3KO


Ron Chambers wrote:
> 
> Buy a Phidget 16/16 board ($100), write a little Visual Basic 6 code,
> input the K3's band data to the Phidget Board, and "bingo", out comes
> whatever switching logic you need on any or all of the 16
> outputs!....(slightly oversimplified of course...)
> Ron N5QQ
> 
> Message: 39
> Date: Tue, 8 Apr 2008 16:04:08 -0700 (PDT)
> From: "J. Heide" <kd6kml at sbcglobal.net>
> Subject: [Elecraft] K3 - Band Decoder
> To: Elecraft at mailman.qth.net
> Message-ID: <510420.99376.qm at web80707.mail.mud.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
> 
> 
> OK, now that the Katiegram has arrived, I need to think about antenna
> switching. I have the following antennas that I want to use with the
> K3
> Windom for most all bands
> Yagi for 20 meters
> Yagi for 6 meters (goes to the XV50)
> Vertical for 160 meters
> Vertical for 6m FM (which is not used with the K2)
> 
> Right now, I have a KRC2 that switches the 20m yagi and 160 vertical
> on antenna port 2 on the radio. Since the K3 has 4 band decoder (TTL?)
> lines coming out of it, it is easy enough to build logic to pull in
> the right relay. Can the "DIGOUT" line be used (with proper buffering,
> of course) to switch a relay for changing from horizontal to vertical
> on 6m? Basically, windom and 6 meter antennas to antenna port 1 (with
> the band decoder switching from windom to 6 meters, and digout
> selecting wither the vert or horiz) and the 20m beam and 160 vert
> switched on antenna port 2?
> 
> I have several RelComm RDL-SR002 relays, one of which I am using with
> the KRC2 now, so quality relays are not a problem here.
> 
> Sorry if this is a bit long, but without equipment in front of me, I
> have a hard time visualizing things.
> 
> 73
> Josh
> K6ZRX
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