[Elecraft] K2 keying mod

[Mike Maiorana]

Don,
As always, thank you for that detailed information. I do have a set of
2.04r firmware to install as I go through my A-to-B mod list.
Best regards,
Mike M.
KU4QO

On Fri, Nov 3, 2017 at 9:39 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> Mike,
>
> Order the SMT1B - PIN diode on carrier board p/n E120014 from Elecraft and
> mount it as shown on page 60 of the latest K2 manual.
> Note that you also will need to have MCU firmware at 2.04.  If yours is
> lower than that, also order FWK2MCIO.
> The current firmware is 2.04r, and if you are dealing with a K2 below SN
> 3000 and have not done the sidetone source change as indicated in the
> KPA100 or KIO2 instructions, you must add it to use 2.04r because the
> sidetone source is locked at U8-4.  That is the only difference between
> 2.04P and 2.04r.
>
> The rest of the components on the Control Board can be mounted as
> indicated in the Keying Waveshape Mod documentation.  If you do not have
> that document, send me an off-list email and I can send it to you.
>
> I have been installing that mod on all the K2s that I upgrade.
>
> 73,
> Don W3FPR
>
>
> On 11/3/2017 8:56 AM, Mike Maiorana wrote:
>
>> I'd like to update my K2 (SN 336) with the keying mod to reduce CW
>> bandwidth. The doc from Elecraft specifies a PIN diode that is obsolete
>> and
>> no longer available (5082-3081).
>>
>>