[Elecraft] Low Voltage Band Data Output

[Bill Frantz]

I have no problem feeding the band data directly into Arduino 
input ports. (I homebrewed the antenna switch controller.) I 
wonder about the load from your antenna switch controller. You 
may need additional pullup resistors. The K3S manual says, 
"External pull-up resistors can be connected a voltage not 
exceeding 14 V."

73 Bill AE6JV

On 7/4/18 at 10:45 AM, jtmiller47 at gmail.com (Jim Miller) wrote:

>The open collector outputs is
>F the K3 or K3s are lightly pulled up then fed thru a series 
>resistor. Your decode must have adequate buffering in place to 
>avoid drawing excessive current. A cmos buffer chip will do the trick.
>73
>
>Jim ab3cv (got the t shirt)
>
>On Jul 4, 2018, at 11:55 AM, William Liporace <wc2l at wc2l.com> wrote:
>
>Hi Folks,
>I thought it was me, but I guess not... When I hook up a cable 
>to the ACC plug for band data output, I get about 4.8v 
>(slightly less than 5v). When I hook up the radio to any 
>antenna switch that has band data input, the voltage goes down 
>to 3v. This is not enough to drive the antenna switches.  This 
>is a new KIO3B board, so is it a bad board? Is there something 
>else not set right that I am missing?? I didn't anything in the manuals..
>
>TNX Will WC2L
>
-----------------------------------------------------------------------
Bill Frantz        | Security is like Government  | Periwinkle
(408)356-8506      | services. The market doesn't | 16345 
Englewood Ave
www.pwpconsult.com | want to pay for them.        | Los Gatos, 
CA 95032