[K3] RE: [Elecraft] in-band-IMD test

[Dean Straw]

Hello, Alexander:

Yes, please send me that pdf.

For your information, I am sending a pdf of an article I wrote in December
1995 QST magazine describing modifications to the AGC system of the ICOM
IC-765 to reduce in-band IMD. This illustrates how a "Fast" time constant
can create unwanted in-band IMD.

This article was why the ARRL Laboratory started making detailed in-band IMD
tests for receivers after December 1995.

Thanks & 73, Dean, N6BV
Senior Assistant Technical Editor, ARRL (Retired)
  -----Original Message-----
  From: e72x (via Nabble) [mailto:ml-user+96067-220166628 at n2.nabble.com]
  Sent: Thursday, November 13, 2008 1:28 AM
  To: Dean Straw
  Subject: Re: in-band-IMD test



  The Audio mod is a very simply! You just need to add simple two resistor
pararell on KIO3 module and replace one RFI choke! If anyone need mode just
send me mail and I will forward pdf direct !

  73, E72X,



  Alexander:

  Sorry but I don't read Russian. What were the K3's AGC settings for the
IMD measurements? At a large input signal (S9+50 dB), using a "Fast" AGC
time constant will often result in poor IMD for conventional receivers using
analog type of AGC systems. I don't know the details of the K3's AGC system,
however.

  Have you tried the S9+50 dB input signal with the "Slow" AGC setting?

  73, Dean Straw, N6BV



    Alexander Ponomarenko-5 wrote:
    GA for all K3 users.
    So many guys has talks about perfect audio sound of K3.
    So many talks about "analog K3 sound" on e-ham.
    But how it possible if K3 have the so bad in-band IMD?
    You can read about "in-band-IMD-measurements" in russian here:
    http://forum.cqham.ru/viewtopic.php?t=17119&postdays=0&postorder=asc&&st
art=0



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