[Elecraft] K3 Band Data

[Don Wilhelm]

Pedro and all,

The first K3 had band data outputs that were driven by open drain FETs. 
That means that the receiving unit had to provide the pullup voltage to 
operate properly.

Since almost no one in the amateur community understood the benefits of 
using open drain or open collector devices to drive the attached device 
(which would provide the pullup voltage), that was changed so the K3 
provided the pullup voltages early in the life of the K3.

If your K3 does not provide voltage on the band data lines, then you can 
add the resistors to +5 volts if you install the REMIOUPGD resistors to 
the band data lines.  This upgrade kit is no longer available from 
Elecraft, but the instructions can be found in the archives.
If you are also wanting to upgrade your K3 with the USB interface, you 
can install the KIO3BUKT3 which replaces the REMIOPGT  kit and provides 
pullup resistors on the band data lines.

73,
Don W3FPR

On 1/11/2020 6:53 PM, Pedro, EA4KD wrote:
> I am the owner of an old K3 (Nov 2007 # 188) and now I need to use Band Data
> outputs. As they did not work I have been looking for the problem and found
> that a long time ago there was a board that sold Elecraft to solve the
> problem (REMIOUPGD) for K3 before December 2008, but that is no longer
> available.
> 
>   
> 
> Someone has available a board of these or information to be able to make
> this modification and use the Band Data?.
>