[Elecraft] K2 keying mod

[Mike Cizek W0VTT]

Hey Don,

Is it true that you can draw the entire K2 schematic from memory?

I learn something every time I read one of your posts.  Thanks a zillion for
all the help you give out on here.  We all owe you a beer or three.

-- 
73,
Mike Cizek WØVTT

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Friday, November 03, 2017 08:40
To: Mike Maiorana; elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 keying mod

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 The doc from Elecraft specifies a PIN diode that is obsolete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).
> 
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