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?.
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