That would make sense...  Its the 13th harmonic of 4Mhz.  

~Brett

On Sun, 2009-08-23 at 22:18 -0400, James Sarte wrote:
> Well, got around to installing the resistor/diode kit today, and for the
> most part was uneventful. I managed to slightly melt/warp the edge of the
> plastic RJ-45 jack at the bottom of the board near C66, not realizing my
> iron was resting on it or very close to it.  That bummed me out to say the
> least!  Thank goodness that jack is at the bottom of the K3 and doesn't
> really do anything.
> 
> Anyway, all seems to work well.  The VFO noise I heard on 5 MHz is now gone
> once SPI2 is engaged in firmware.  What is odd though is that there now
> seems to be VFO noise around 52 MHz where it was never noticed before.
> 
> 73 de James K2QI
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Eric Swartz -WA6HHQ,
> Elecraft
> Sent: Sunday, August 23, 2009 5:31 PM
> To: David Pratt
> Cc: Elecraft Reflector
> Subject: Re: [Elecraft] K3 Hardware Updates
> 
> This was mis-worded in the doc and is being corrected. It should read:
> 
> "IMPORTANT:  You must complete the modification as described below before
> enabling the vfo noise reduction menu item in version 3.24 or later. Failure
> to do so may result in erratic behavior of your K3."
> 
> Basically, he resistor/diode mod is only necessary if you -enable- the
> option in the menu (which only appears in V3.24 and later). 
> 
> Its perfectly OK to run 3.24 (or later) and not make that h/w mod (as long
> as it is not enabled in the menu.)
> 
> There is no downside to making this h/w mod, even if you do not enable 
> the menu option.
> 
> 73, Eric   WA6HHQ
> 
> 
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