Re: [Elecraft] K2 Rev A to Rev B Upgrade

[Don Wilhelm]

Ralph,

Yes, the A to B mods are worthwhile.  I have done many of them.
Download the K2 A to B instructions and look at the first page to see 
the entire list of associated upgrades.


The only 2 mods that are not listed there are the K2 Keying Waveshape 
Mod and the Extremely High Signal Handling mod (2 back to back 1N4148 
diodes at the input of the IF Amp).  The K2 Keying Waveshape Mod kit was 
withdrawn because the PIN diode is no longer available in thru-hole 
format, but Elecraft has a substitute that is used in new K2s.  I can 
send you the instructions - if you want the instructions, send me a 
private email.


With that serial number, you will find added benefit if you change the 
IF crystals on both the RF Board and the KSB2 option.  While you have 
the crystals off the KSB2, it is an easy matter to change the filter 
capacitors to widen the OP1 filter to 2.4kHz from the older 2.1kHz 
bandwidth.


While you are at it, change the AG Gain pot and install the Alternate AF 
Gain Wiring mod.


I am not certain how long it would take someone to do all the mods doing 
it for the first time.  It takes me less than a day, plus a couple hours 
to do the alignment and test, but then I have had a lot of practice.


73,
Don W3FPR

On 4/21/2017 10:59 AM, Ralph Perreca wrote:

Hi All
I purchased my Elecraft K2 several months ago Ser # 1913 firmware 1.06F 1.02 
with ATU And SSB options I am considering doing the Rev A to Rev B upgrade and 
would like some feedback as to whether it is worth doing and why as well as 
approx build time for a builder with average experience I have built several 
small kits and the Elecraft K1

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Re: [Elecraft] K2 Rev A to Rev B Upgrade

[Guy Olinger K2AV]

Revision B fixed a lot of things.

With your experience, I would do the A:B upgrades and all the other
mods. I'm not sure the DSP board is available any more from Elecraft,
DSP's CPU part not made any more is what I'm remembering.

I did them one at a time, spread out. Not a one or two night project.

The result of all the mods + DSP was impressive. It heard better on
the low bands than my FT1000MP.

73, Guy K2AV

On Fri, Apr 21, 2017 at 10:59 AM, Ralph Perreca  wrote:
> Hi All
> I purchased my Elecraft K2 several months ago Ser # 1913 firmware 1.06F 1.02 
> with ATU And SSB options I am considering doing the Rev A to Rev B upgrade 
> and would like some feedback as to whether it is worth doing and why as well 
> as approx build time for a builder with average experience I have built 
> several small kits and the Elecraft K1
> Thank you
> Ralph
> KD2EJR
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> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft@mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to k2av@gmail.com
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[Elecraft] K2 Rev A to Rev B Upgrade

[Ralph Perreca]

Hi All
I purchased my Elecraft K2 several months ago Ser # 1913 firmware 1.06F 1.02 
with ATU And SSB options I am considering doing the Rev A to Rev B upgrade and 
would like some feedback as to whether it is worth doing and why as well as 
approx build time for a builder with average experience I have built several 
small kits and the Elecraft K1 
Thank you
Ralph
KD2EJR
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