[Elecraft] K2 - NOISY POLLING

[Donald Nesbitt]

Hello Chris - I am using my K2/100 with N1MM and do not notice the noise
that you are referring to.  I use the K2/100 with two laptops - one an old
P1 266mhz with only 80 meg ram (yes, it works fine with N1MM as long as you
don't have anything else running!). This old computer has a "real" RS-232
port.  The reason I mention that is that my other laptop is a 2.6 gig with
512 meg ram, etc but NO serial port.  I have to use a USB to serial
converter cable with it.  When I use that computer, I can hear the converter
creating a slow pulsing broad rf spectrum that is receivable on all the rest
of the rigs in the shack.  This is true whether the K2/100 is connected to
that computer or not.  Now the interesting part is that when the K2/100 is
connected to the converter, I cannot hear the noise in the K2 - only in the
other rigs.  BTW - the usb to serial converter works very nicely with N1MM.
You might want to check to see if you have any ground loop between the K2
and the computer.  I think the cable should be grounded at only one end to
kill the ground loop.  73 es gud dx --don n4hh K2/100 #2028 KAT100, etc.
etc.
----- Original Message ----- 
From: "Chris Page" <g4bue at adur-press.co.uk>
To: <elecraft at mailman.qth.net>
Sent: Thursday, February 17, 2005 8:36 AM
Subject: [Elecraft] K2 - NOISY POLLING


> Does anyone else have a problem with noisy polling with their K2 when
> used with a computer logging program, and is there a cure for it?
>
> I have two K2/100s which both have the 160m, NB and DSP options and
> one has the SSB option.  I am using N1MM Logger with an old desk-top
> (about 300MHz) computer under Windows 98 and when I listen to the SSB
> K2 on any band with the AF gain at minimum, I can hear a soft pulse
> every second or so.  This does not increase as the AF Gain is
> advanced and normally the sound of signals, etc masks it, but it is
> slightly annoying when tuning on a very quiet band.
>
> I can just about hear it on my other K2 if I really listen hard for
> it but I don't think I would have noticed it on this K2 had I not
> first heard it on the SSB K2.  The problem must therefore be
> something to do with the SSB K2.
>
> Gary Surrency suggested moving the ribbon cable between the K2 and
> K2/100 further away from the KSB2 unit and also try switching off the
> RTC (in the secondary menu).  I have tried both and neither make any
difference and Gary suggested I now ask on here.
>
> Thanks for any help.
>
> 73 de Chris, W4/G4BUE
>
>
> arse just installed the repaired K2 and my own K2 in a SO2R set-up
> > with N1MM Logger for contesting and have noticed that the polling
> (at
> > least I think that's what it is) is very noisy on the repaired K2
> > compared with my own K2.
> >
> > I hear a continual soft pulse about every second which does not
> > increase as the AF gain is increased.  When I disconnect the radio
> > from N1MM Logger, it goes away.
> >
> > Is there anything I can do to reduce the volume of the polling,
> > please?
>
>
>
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