[Elecraft] K3 Enhancements and Application Notes Page (CW risetime)

[Don Ehrlich]

My S/N 195 has a 1 microfarad installed and has what I would call an 8 mS 
rise time.

Don K7FJ


----- Original Message ----- 
From: "GW0ETF" <gw0etf at btinternet.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, March 28, 2008 6:48 AM
Subject: Re: [Elecraft] K3 Enhancements and Application Notes Page (CW 
risetime)


>
> According to the Application Notes Page my K3 #145 should have an ~8ms 
> rise
> time. However, viewed on my analogue 'scope the rise time (0 - 100%) is
> definitely shorter and nearer to 5ms with a similar fall time though with 
> a
> sharper falling transition edge.
>
> The notes suggest the mod is necessary to enable a future menu selectable
> envelope adjustment but I don't want to reduce my rise time to a nominal 
> 5ms
> if it already is around that figure anyway - presumably I will end up with
> an even steeper leading edge.
>
> Anyone else looked at keying waveforms in pre s/n 211 K3s...?
>
> Stewart Rolfe, GW0ETF
>
>
> Eric - WA6HHQ wrote:
>>
>> At long last we have the K3 Enhancements and Application Notes Page, and
>> K3 enhancements parts kits order form, on-line. :-)
>>
>> See: http://www.elecraft.com/K3/k3_app_notes.htm
>> and:
>> http://www.elecraft.com/order_form_parts.htm#K3%20Parts
>>
>> There are .pdf documents for each item, along with the approximate date
>> and s/n of any K3 enhancement phase in.
>>
>> 73, Eric  WA6HHQ
>>
>>
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>
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