in-band-IMD test

[JOHN-23]

Hello,

Good job Alex!!! I was pointing out weak in the Channel IMD characteristics of K3 for long time!!!

73!
John,SP2GGZ,N2KFC,YB1AQV,


     
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[Joe Subich, W4TV-3]

Have these tests been made AFTER the AF board modification?
Improvements to the power supply to the front panel can have
a significant effect on this issue.

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of JOHN
> Sent: Thursday, November 13, 2008 10:01 AM
> To: [hidden email]
> Subject: Re: [Elecraft] [K3] in-band-IMD test
>
>
> Hello,
>
> Good job Alex!!! I was pointing out weak in the Channel IMD
> characteristics of K3 for long time!!!
>
> 73!
> John,SP2GGZ,N2KFC,YB1AQV,
>

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[Mike Harris-9]

G'day,

The plot thickens.  We need to know more about these modifications.  Or
have I missed something these past few weeks.

Regards,

Mike VP8NO

----- Original Message -----
From: "Joe Subich, W4TV" <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Thursday, November 13, 2008 12:39 PM
Subject: RE: [Elecraft] [K3] in-band-IMD test


|
| Have these tests been made AFTER the AF board modification?
| Improvements to the power supply to the front panel can have
| a significant effect on this issue.

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[Jim-168]

Current out the door models mod'ed???????????????

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Mike Harris
Sent: Thursday, November 13, 2008 11:08 AM
To: [hidden email]
Subject: Re: [Elecraft] [K3] in-band-IMD test

G'day,

The plot thickens.  We need to know more about these modifications.  Or
have I missed something these past few weeks.

Regards,

Mike VP8NO

----- Original Message -----
From: "Joe Subich, W4TV" <[hidden email]>
To: <[hidden email]>; <[hidden email]>
Sent: Thursday, November 13, 2008 12:39 PM
Subject: RE: [Elecraft] [K3] in-band-IMD test


|
| Have these tests been made AFTER the AF board modification?
| Improvements to the power supply to the front panel can have
| a significant effect on this issue.

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[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:[hidden email]]
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,


<QUOTE author="Dean Straw">
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&&start=0

---

This email is a reply to your post @ http://n2.nabble.com/in-band-IMD-test-tp1491448p1493383.html
You can reply by email or by visting the link above.

[Joe Subich, W4TV-3]

> You'll need to contact [hidden email] for info. For some
> reason the kit and the instructions are not on the Elecraft WEB site.

The kit is listed here:

http://www.elecraft.com/order_form_parts.htm#K3%20Parts

However, the instructions are not on the web site.

73,

   ... Joe, W4TV
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Ron
> D'Eau Claire
> Sent: Thursday, November 13, 2008 12:20 PM
> To: [hidden email]; [hidden email];
> [hidden email]
> Subject: [Elecraft] K3 AF Stage Upgrade (WAS: in-band-IMD test)
>
>
> Yes, this is an 'official' mod. Elecraft has instructions and
> a kit of parts for those who want them.
>
> You'll need to contact [hidden email] for info. For some
> reason the kit and the instructions are not on the Elecraft WEB site.
>
> Ron AC7AC
>
> -----Original Message-----
>
>
>
> Hallo,
>
> > 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 !
>
> Has this modification been blessed by Elecraft or is it an
> unofficial mod?
>
> Is the PDF an official doc by Elecraft?
>
> vy 73 de toby
>
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>
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[Bob Cunnings NW8L]

Hmmm -  improvements to the front panel power supply?

Bob NW8L

On Thu, Nov 13, 2008 at 8:39 AM, Joe Subich, W4TV
<[hidden email]> wrote:

>
> Have these tests been made AFTER the AF board modification?
> Improvements to the power supply to the front panel can have
> a significant effect on this issue.
>
>
>> -----Original Message-----
>> From: [hidden email]
>> [mailto:[hidden email]] On Behalf Of JOHN
>> Sent: Thursday, November 13, 2008 10:01 AM
>> To: [hidden email]
>> Subject: Re: [Elecraft] [K3] in-band-IMD test
>>
>>
>> Hello,
>>
>> Good job Alex!!! I was pointing out weak in the Channel IMD
>> characteristics of K3 for long time!!!
>>
>> 73!
>> John,SP2GGZ,N2KFC,YB1AQV,
>>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
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>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

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[Joe Subich, W4TV-3]

> Hmmm -  improvements to the front panel power supply?

According to the documentation, the RF choke is being replaced by
another with significantly less resistance.  This results in less
voltage drop on signal (audio peaks) and will obviously result in
less IMD (due to current starvation in the audio circuits).
 

> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Bob Cunnings
> Sent: Thursday, November 13, 2008 1:07 PM
> To: [hidden email]
> Subject: Re: [Elecraft] [K3] in-band-IMD test
>
>
> Hmmm -  improvements to the front panel power supply?
>
> Bob NW8L
>
> On Thu, Nov 13, 2008 at 8:39 AM, Joe Subich, W4TV
> <[hidden email]> wrote:
> >
> > Have these tests been made AFTER the AF board modification?
> > Improvements to the power supply to the front panel can have a
> > significant effect on this issue.
> >
> >
> >> -----Original Message-----
> >> From: [hidden email]
> >> [mailto:[hidden email]] On Behalf Of JOHN
> >> Sent: Thursday, November 13, 2008 10:01 AM
> >> To: [hidden email]
> >> Subject: Re: [Elecraft] [K3] in-band-IMD test
> >>
> >>
> >> Hello,
> >>
> >> Good job Alex!!! I was pointing out weak in the Channel IMD
> >> characteristics of K3 for long time!!!
> >>
> >> 73!
> >> John,SP2GGZ,N2KFC,YB1AQV,
> >>
> >
> > _______________________________________________
> > Elecraft mailing list
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> >
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> >
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