[Elecraft] K2 No Side Tone After Firmware Upgrade

Sun Mar 14 19:04:06 EDT 2010

 Oops!  That's a grab and go K2........

-----Original Message-----
From: cstoverva at aol.com
To: olinger at bellsouth.net
Cc: elecraft at mailman.qth.net
Sent: Sun, Mar 14, 2010 6:43 pm
Subject: Re: [Elecraft] K2 No Side Tone After Firmware Upgrade

 Guy,

Who ever owned #972 before me did the B mods to the rig.  It came to me equipped 
with the KSB2, KNB2 and K160RX.  I'm going to build the KDSP2 to drop in later.  
I have the QRP top with a KAT2, KIO2 and KBT2 from K2 #5939 that I built a few 
years ago. 

#5939 is decked out with the KPA100,KDSP2,KSB2,KNB2,K160RX and KAT100 and serves 
as a back up for my K3.

This arrangement will give me a grab and K2 without having to change tops or 
even moving the K2 in the shack.  

I love the building process, but money is a little tight right now and this one 
came at the right price.  Just made economic sense.

The line up now included a K1, K2/10, K2/100 and a K3/100.

All great rigs.

Chuck K4QS

-----Original Message-----
From: Guy Olinger K2AV <olinger at bellsouth.net>
To: cstoverva at aol.com
Cc: don at w3fpr.com
Sent: Sun, Mar 14, 2010 5:42 pm
Subject: Re: [Elecraft] K2 No Side Tone After Firmware Upgrade

I added DSP to my bought-used K2 #1239 when I did all the A/B mod
upgrades and replaced all the filter crystals, and it was stunning the
difference it made.  Once I got the crystal and DSP skirts aligned for
each filter BW slot, it was dynamite, and frankly not so far off K3
performance.  I have all the options and the battery top as well.  You
doing the A/B mods?

73, Guy.

On Sun, Mar 14, 2010 at 4:09 PM,  <cstoverva at aol.com> wrote:
>
>
>
>  Done,
>
> The sidetone is up and running.  Now to recalibrate the VFO and check a few 
other things and I will start building the KDSP2.
>
> I have a QRP top with KAT2, KIO2 and KBT2 standing by.   #972 will be a fully 
loaded and up to date K2/10 sitting in the line up with my K1, K2/100 and K3.
>
> Thanks again Don.
>
> Chuck K4QS
>
>
>
>
>
>
> -----Original Message-----
> From: Don Wilhelm <w3fpr at embarqmail.com>
> To: elecraft at mailman.qth.net
> Sent: Sun, Mar 14, 2010 4:42 pm
> Subject: Re: [Elecraft] K2 No Side Tone After Firmware Upgrade
>
>
> Chuck,
>
> While both sidetone sources should be supported in 2.04P, go ahead and
> make the change anyway.  Yes, make the cut on the trace ging between
> U6-25 and Q5.  You will add 2 wires.  The one from U8-4 to Q5 (make
> certain you do not put it on the R-PAK) is the one important for the
> sidetone.  The long wire from U6 pin 25 and the capacitor is only used
> for data communications, and will not be used unless you have either the
> KIO2 or the KPA100, but add it anyway just for completeness.
>
> After you make the change, the sidetone source will be only U8-4.  If
> you added the inductor and the resistor for the sidetone waveshape
> during the upgrade, check those components (and the trace cut) carefully
> if the sidetone still does not work.
>
> 73,
> Don W3FPR
>
> cstoverva at aol.com wrote:
>>  Hi Don,
>>
>> This is K2 sn972 I'm upgrading, so it's an oldy.  The firmware chip is 2.04P
> which I somehow came into possession of while building my first K2 sn5939 a 
few
> years ago.  I had Elecraft send only the new I/O chip, so the firmware came to
> me in pieces.  I didn't see any notes about circuit modifications in the
> firmware documentation that I have.
>>
>> I do have the mods located on page 10 of the KIO2 manual.  Just to verify,
> when you say deletion, are you referring to the cut trace between U6-25 and 
Q5?
>
>>
>> I own a .001uf cap, some hookup wire and an Exacto knife, so I should be able
> to knock this out in a few minutes.
>>
>> Thanks for pointing me in the right place.
>>
>> Chuck K4QS
>>
>>
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