KX3 Sherwood RX Test Numbers Posted

[Eric Swartz - WA6HHQ]

See:
http://www.sherweng.com/table.html

:-)

73,

--
Eric
---
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[N0OKS]

Wow!!!

Mark, NØOKS
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[ab2tc]

Hi,

Wow, the number 1 spot! That's incredible. Congratulations. I am especially surprised and impressed by the phase noise performance. I had the impression that the synth in the KX3 wasn't that great for phase noise, being a DDS without a cleanup PLL.

AB2TC - Knut

Eric Swartz - WA6HHQ, Elecraft wrote

See:
http://www.sherweng.com/table.html

:-)

73,

--
Eric
---
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[Eric Swartz - WA6HHQ]

That's because Its not a DDS. :-)

73,

Eric
---
www.elecraft.com

On 8/10/2012 12:26 PM, ab2tc wrote:

> Hi,
>
> Wow, the number 1 spot! That's incredible. Congratulations. I am especially
> surprised and impressed by the phase noise performance. I had the impression
> that the synth in the KX3 wasn't that great for phase noise, being a DDS
> without a cleanup PLL.
>
> AB2TC - Knut
>
>
> Eric Swartz - WA6HHQ, Elecraft wrote
>> See:
>> http://www.sherweng.com/table.html
>>
>> :-)
>>

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[WB4SON]

Oh snap -- there goes the value of my K3!

Fantastic job, Elecraft!

73, Bob, WB4SON
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[Jon Kåre Hellan]

On 08/10/2012 08:09 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> See:
> http://www.sherweng.com/table.html
>
> :-)
>
> 73,
>

Footnote v: "At 1 kHz performance is opposite sideband rejection
limited. On CW consider switching to 8-kHz IF. Note: Roofing filter
disabled in this mode."

What does that mean?

73
Jon LA4RT
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[Jim Brown-10]

Great numbers!  Wayne has outdone himself again.

Can you explain note "v?"

73, Jim K9YC


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[Tony Estep]

On Fri, Aug 10, 2012 at 1:09 PM, Eric Swartz - WA6HHQ, Elecraft <
[hidden email]> wrote:

> See:
> http://www.sherweng.com/table.html
>
> --------

Holy cow! I guess the combo of the KX3's cool SDR design and that unique
baseband roofing filter is the winning recipe!

Tony KT0NY

--
http://www.isb.edu/faculty/facultydir.aspx?ddlFaculty=352
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[Keith Heimbold]

Double wow! I can't wait to see what they say on some of the other reflectors about this game changer!

Congrats Elecraft!

Keith
AG6AZ

Sent from my iPhone please excuse typos

On Aug 10, 2012, at 12:22 PM, "Mark Kachel" <[hidden email]> wrote:

> Wow!!!
>
> Mark, NØOKS
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[wayne burdick]

Jim Brown wrote:

> Can you explain note "v?"

Hi Jim,

Footnote 'v' (on the 2-kHz IMD) actually refers to a measurement at a  
1-kHz spacing, which is not part of the comparison table:

    v:   At 1 kHz, performance is opposite-sideband rejection limited.

As you know, a quadrature direct-conversion receiver (such as the KX3  
or the Flex radios) depends on gain/phase balance to suppress the  
opposite-sideband signal. What Rob is referring to, here, is that when  
you do an IMDDR3 test at a very close offset (say 1 kHz), with the  
roofing filters enabled (i.e., using a zero I.F.), then the opposite-
sideband signal might dominate the measurement. (This depends on the  
relationship between the interfering signal and the desired signal.)  
In his case this limited the measurement to an equivalent DR of 65 dB.

Our main goal for the KX3 was to provide maximum portability yet all-
band/all-mode coverage. If your goal is to get the absolute best DR at  
very close spacings, then the K3 would be the better choice, given its  
narrow crystal filters and nearly infinite opposite sideband rejection.

I'll expand on this topic later.

73,
Wayne
N6KR




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[ab2tc]

Hi,

I am always curious about synthesizer technology utilized in new radios. If it's not DDS, then what is is it?

AB2TC - Knut

Eric Swartz - WA6HHQ, Elecraft wrote

That's because Its not a DDS. :-)

73,

Eric
---
www.elecraft.com

<snip>

[wayne burdick]

Bob wrote:

> Oh snap -- there goes the value of my K3!

Not :)

The two are very different in ways not apparent by their close  
listings in the table. See my next post.

Wayne
N6KR



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[Nate Bargmann]

* On 2012 10 Aug 13:09 -0500, Eric Swartz - WA6HHQ, Elecraft wrote:
> See:
> http://www.sherweng.com/table.html

Well, I guess it's time to dump the old K3...


:-D


Good show, Eric and Wayne.

73, de Nate, N0NB >>

--

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possible worlds.  The pessimist fears this is true."

Ham radio, Linux, bikes, and more: http://www.n0nb.us
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[Matt Maguire]

Jim,

This is my understanding of note "v":

The KX3 is a direct conversion architecture, and relies of the I & Q signals to cancel out opposite sideband. For this cancellation to work, the balance of amplitude and phase needs to be very precise, and it looks like Elecraft have managed to get the image to be 65dB down, which is very good.

Based on the note "v" comment, it seems for the case of CW, this image will normally occur 1kHz away from the desired signal. If you have a close-in signal 1kHz away, then what you can do is enable 8kHz shift, which means the image is now 16 kHz away. Now the close-in dynamic range is 96dB, since the roofing filter can't be used with the 8kHz IF. Of course, if you are unlucky enough to have a strong signal 16kHz away (on the other side of your LO), then this signal will be down 65dB.

73, Matt VK2ACL

On 11/08/2012, at 5:39 AM, Jim Brown <[hidden email]> wrote:

> Great numbers!  Wayne has outdone himself again.
>
> Can you explain note "v?"
>
> 73, Jim K9YC
>
>
> ______________________________________________________________
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[wayne burdick]

DDS-driven PLL, like the K3. Just a different, highly integrated  
version of it.

73,
Wayne
N6KR

On Aug 10, 2012, at 1:39 PM, ab2tc wrote:

> Hi,
>
> I am always curious about synthesizer technology utilized in new  
> radios. If
> it's not DDS, then what is is it?
>
> AB2TC - Knut
>
>
> Eric Swartz - WA6HHQ, Elecraft wrote
>>
>> That's because Its not a DDS. :-)
>>
>> 73,
>>
>> Eric
>> ---
>> www.elecraft.com
>>
>> <snip>
>>
>
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/KX3-Sherwood-RX-Test-Numbers-Posted-tp7560771p7560786.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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[Doug Person-3]

Congratulations Wayne, Eric and the "E" team.  You guys are just
amazing. What an incredible product.

73, Doug -- K0DXV

On 8/10/2012 12:09 PM, Eric Swartz - WA6HHQ, Elecraft wrote:
> See:
> http://www.sherweng.com/table.html
>
> :-)
>
> 73,
>

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[Barry K3NDM]

Eric,
I was under the impression the the KX3 would not perform as well as the K2, but would be a better trail radio with some gee whiz features. Looks like you guys over-achieved. Good show!!

73,
Barry
K3NDM

----- Original Message -----
From: "Eric Swartz - WA6HHQ, Elecraft" <[hidden email]>
To: "Elecraft Reflector" <[hidden email]>
Sent: Friday, August 10, 2012 2:09:17 PM
Subject: [Elecraft] KX3 Sherwood RX Test Numbers Posted

See:
http://www.sherweng.com/table.html 

:-)

73,

--
Eric
---
www.elecraft.com

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[Eric Swartz - WA6HHQ]

We  definitely have a few over achievers here.. ;-)

We had tested to these numbers in the lab, but had to wait until they were confirmed by independent testers. Pretty cool!

73,

Eric

www.elecraft.com
_..._



On Aug 10, 2012, at 10:00 PM, [hidden email] wrote:

> Eric,
>      I was under the impression the the KX3 would not perform as well as the K2, but would be a better trail radio with some gee whiz features. Looks like you guys over-achieved. Good show!!
>
> 73,
> Barry
> K3NDM
>
> From: "Eric Swartz - WA6HHQ, Elecraft" <[hidden email]>
> To: "Elecraft Reflector" <[hidden email]>
> Sent: Friday, August 10, 2012 2:09:17 PM
> Subject: [Elecraft] KX3 Sherwood RX Test Numbers Posted
>
> See:
> http://www.sherweng.com/table.html
>
> :-)
>
> 73,
>
> --
> Eric
> ---
> www.elecraft.com
>
> ______________________________________________________________
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