[Elecraft] RFI

[Joe Subich, W4TV]

> I am noticing keying errors on the k3 ERR PLL and it usually 
> goes away when I shutdown the MKII interface. 

microKEYER II does not interact with the K3 PLL/Synthesizer 
in any way.  You are seeing "common mode" RF effecting the 
K3.  That common mode RF can be getting there through any 
device connected to the transceiver.  

Make sure the feedline to your BigIR has an effective common 
mode choke so that it does not act like a random radial and 
put RF on the K3 and/or external interface.  

An interim solution is to change the feedline length as it 
will change the RF distribution in the shack! 

73, 

   ... Joe, W4TV 
 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of John Gaynard
> Sent: Sunday, November 08, 2009 11:41 AM
> To: 'Stewart'; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] RFI
> 
> 
> I am noticing keying errors on the k3 ERR PLL and it usually 
> goes away when I shutdown the MKII interface.  I have 
> ferrites on every cable going into the K3 but did not know 
> about the MH MKII USB issue.  I am noticing it when I use 
> WinKey from my ACLog logger.  I am running a KW into a 
> SteppIR BiggIR vertical with an almost 1:1 SWR.
> 
> Thanks
> 
> John K8WDN
> 
> -----Original Message-----
> From: Stewart [mailto:stewart at baker.nildram.co.uk] 
> Sent: Sunday, November 08, 2009 4:24 AM
> To: John Gaynard; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] RFI
> 
> John,
> What do you mean by RFI is shutting down your K3 ?
> Please give some more details.
> 
> There is a known issue with the MH MKII where it has poor immunity on 
> the USB interface in the presence of a strong RF field.
> A mod  of fitting a single capacitor  is available to provide 
> the solution.
> 
> 73
> Stewart G3RXQ
> On Sat, 7 Nov 2009 20:58:54 -0500, John Gaynard wrote:
> > I am getting destroyed by RFI on the back panel.  I am using a 
> > MicroHam MKII interface.  I have ferrites on every cable 
> from the MKII 
> > and it is still shutting down the K3.  I know the real 
> solution is the 
> > RFI mod for
> the
> > K3.  Is there an interim solution?  How long would it take if I 
> > shipped
> the
> > K3 back to have all the current mods applied?  
> Guillain-Barre Syndrome 
> > pretty much destroyed my sense of touch so intricate mods 
> are beyond 
> > my attempt.  This RFI is killing my SS attempt tonight.
> >
> >
> > John K8WDN
> >
> >
> > K3 #157
> >
> >
> > John
> >
> >
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