[Elecraft] K3 Band Data

[Clay Autery]

Here you go:

https://ftp.elecraft.com/K3/Mod%20Notes%20Alerts/K3ALCMod_Rev_B.pdf 
<----  K3 Negative ALC and Ext Band Data Pull-up Mods, Rev B: REMIOUPGD
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The above doc has the instructions for EXT ALC mod and Pullup resistor mod.

https://ftp.elecraft.com/K3S/Manuals%20Downloads/KIO3BUPGD-FAQ%20rev%20A.pdf 
<----  Replaces REMIOUPGD  with KIO3BUPKT FAQ
https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740280%20KIO3B%20Installation%20Rev%20A3.pdf 
<---KIO3BUPKT INSTALL

Hope this stuff is what you are looking for....

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 01/12/20 02:01, Pedro, EA4KD wrote:
> Many thanks Don;
>
> Only need the instructions to add the resistors, I'll keep looking because I haven't found yet.
>
> Pedro, EA4KD
>
> -----Mensaje original-----
> De: Don Wilhelm [mailto:donwilh at embarqmail.com]
> Enviado el: domingo, 12 de enero de 2020 1:24
> Para: Pedro, EA4KD; Elecraft at mailman.qth.net
> Asunto: Re: [Elecraft] K3 Band Data
>
> 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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