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K3: Sherwood Receiver Test Data question

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Pierre

K3: Sherwood Receiver Test Data question

Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New Synthesizer) ...which compares very well to the 'original' K3.

73 de Pierre VE2PID
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Joe Subich, W4TV-4

Re: K3: Sherwood Receiver Test Data question

Of more interest is that the new synthesizer numbers show 6 dB
lower noise floor without the preamp. That means much more
sensitivity on 12 and 10 meters where external noise is low.

It is also interesting that the new numbers were achieved with
AGC threshold 6db *lower* (sooner) than with the original
synthesizer.

73,

... Joe, W4TV

On 2015-03-07 10:24 PM, Pierre wrote:

> Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New Synthesizer) ...which compares very well to the 'original' K3.
>
> 73 de Pierre VE2PID
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wayne burdick

Re: K3: Sherwood Receiver Test Data question

Administrator

In reply to this post by Pierre

Pierre <[hidden email]> wrote:

> Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New Synthesizer) ...which compares very well to the 'original' K3.

Yes....In our haste, we sent Rob a K3 with new synths but uncalibrated RX gain. Now that the automated RX GAIN procedure has been completed, this K3 behaves normally.

73,
Wayne
N6KR

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Guy Olinger K2AV

Re: K3: Sherwood Receiver Test Data question

Now that makes a serious external preamp useful. Will also help very lossy
lowband RX antennas. 73, Guy

On Sunday, March 8, 2015, Wayne Burdick <[hidden email]> wrote:

> Pierre <[hidden email] <javascript:;>> wrote:
>
> > Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New
> Synthesizer) ...which compares very well to the 'original' K3.
>
>
> Yes....In our haste, we sent Rob a K3 with new synths but uncalibrated RX
> gain. Now that the automated RX GAIN procedure has been completed, this K3
> behaves normally.
>
> 73,
> Wayne
> N6KR
>
>
>

Barry

Re: K3: Sherwood Receiver Test Data question

All this talk about better numbers is great, but has anyone done a side by side comparison of on the air differences? That's what I'd like to hear about.
Barry W2UP

David Bunte

Re: K3: Sherwood Receiver Test Data question

Barry -

It will be interesting to hear from someone who has done that... but I put
two new synth boards in the K3 of W9FAM, and he is THRILLED at being able
to run QRQ without having to be in the QRQ mode, thus being able to use
RIT, without degradation of the CW his K3 is putting out.

For him that is important every moment he is on the air... He realizes he
may never be aware of receive improvement, but knows the upgrade was well
worth it.

In my case, I seldom go over 30 wpm, so I did not need the upgrade the way
he did, but I am still glad I did it. I may never know how differently my
rig actually performs, but it "seems" quieter. I realize that could be
just because I want to justify the upgrade, but I am a very happy camper
regardless.

Dave - K9FN

On Sun, Mar 8, 2015 at 9:23 AM, Barry <[hidden email]> wrote:

> All this talk about better numbers is great, but has anyone done a side by
> side comparison of on the air differences? That's what I'd like to hear
> about.
> Barry W2UP
>
>
>
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-Sherwood-Receiver-Test-Data-question-tp7599908p7599927.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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joemoffatt

Re: K3: Sherwood Receiver Test Data question

I can't compare against a K3, but I can against a Flex5000a and a Flex 6300, and this Rx is quieter and smoother at weak signals. I am a computer junkie by trade and I really can't stand the SmartSDR interface for the 6000 series Flex's. I have had a Flex for 2.5 years and I decided it was time for a well designed small knobbed radio. I added an Afedri SDR as a panadapter and I have the best of both worlds. No loss of computer features and gained the K3.

Joe

-------- Original message --------
From: David Bunte <[hidden email]>
Date: 03/08/2015 8:19 AM (GMT-07:00)
To: Barry <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] K3: Sherwood Receiver Test Data question

Barry -

It will be interesting to hear from someone who has done that... but I put
two new synth boards in the K3 of W9FAM, and he is THRILLED at being able
to run QRQ without having to be in the QRQ mode, thus being able to use
RIT, without degradation of the CW his K3 is putting out.

For him that is important every moment he is on the air... He realizes he
may never be aware of receive improvement, but knows the upgrade was well
worth it.

In my case, I seldom go over 30 wpm, so I did not need the upgrade the way
he did, but I am still glad I did it. I may never know how differently my
rig actually performs, but it "seems" quieter. I realize that could be
just because I want to justify the upgrade, but I am a very happy camper
regardless.

Dave - K9FN

On Sun, Mar 8, 2015 at 9:23 AM, Barry <[hidden email]><mailto:[hidden email]>> wrote:

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Phil Wheeler-2

Re: K3: Sherwood Receiver Test Data question

In reply to this post by wayne burdick

Wayne,

Is that "automated RX GAIN procedure" the same as
the one the K3 Utility walks you through? I did
that yesterday with my XG3 and it was pretty
slick. No obvious change from the factory settings
(my K3 is relatively new, about a year old), but
I'm glad I did it. Motivation was that at some
point yesterday 20 seemed to have died, and I
wanted to check out the K3's RX.

I did it only on 20 meters: Is there any reason to
do it on more than one band?

Phil W7OX

On 3/7/15 9:55 PM, Wayne Burdick wrote:
> Pierre <[hidden email]> wrote:
>
>> Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New Synthesizer) ...which compares very well to the 'original' K3.
>
> Yes....In our haste, we sent Rob a K3 with new synths but uncalibrated RX gain. Now that the automated RX GAIN procedure has been completed, this K3 behaves normally.
>
> 73,
> Wayne
> N6KR

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David Gilbert

Re: K3: Sherwood Receiver Test Data question

In reply to this post by Barry

Because numbers are so subjective?

On 3/8/2015 6:23 AM, Barry wrote:
> All this talk about better numbers is great, but has anyone done a side by
> side comparison of on the air differences? That's what I'd like to hear
> about.
> Barry W2UP
>
>
>

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dmb@lightstream.net

Re: K3: Sherwood Receiver Test Data question

In reply to this post by David Bunte

I concur 100% with W9FAM's observations, and would add that the same
benefit applies to SPLIT operation as well as (less importantly) to [SSB +
CW] operation. In fact, it works so well that I have turned QRQ mode OFF.
I can hear a slight change in 'weight' between QRQ engaged or disengaged
(the state of which still changes as a function of engaging RIT, IT, SPLIT
...), but with the new Synth board, I actually prefer the timing w/ QRQ
off. With QRQ disengaged, maximum sending speed is 50 WPM, whereas w/ QRQ
engaged, the maximum speed is 100 WPM. I only use paddles, and I have no
ambition (or capability) to send with paddles beyond 50 WPM, so for me,
QRQ-OFF mode is PERFECT.

Any and all other KSNY3A improvements/enhancements are just icing on the
(K3) cake.

73, Dale
WA8SRA

> Barry -
>
> It will be interesting to hear from someone who has done that... but I put
> two new synth boards in the K3 of W9FAM, and he is THRILLED at being able
> to run QRQ without having to be in the QRQ mode, thus being able to use
> RIT, without degradation of the CW his K3 is putting out.
>
> For him that is important every moment he is on the air... He realizes he
> may never be aware of receive improvement, but knows the upgrade was well
> worth it.
> ....

Mike Reublin NF4L

Re: K3: Sherwood Receiver Test Data question

In reply to this post by David Gilbert

I seem to remember an Intel processor where they were....

73, Mike NF4L

> On Mar 8, 2015, at 12:56, David Gilbert <[hidden email]> wrote:
>
>
> Because numbers are so subjective?
>
>
> On 3/8/2015 6:23 AM, Barry wrote:
>> All this talk about better numbers is great, but has anyone done a side by
>> side comparison of on the air differences? That's what I'd like to hear
>> about.
>> Barry W2UP

wayne burdick

Re: [Elecraft_K3] K3: Sherwood Receiver Test Data question

Administrator

In reply to this post by Phil Wheeler-2

On Mar 8, 2015, at 9:43 AM, Phil Wheeler [hidden email] [Elecraft_K3] <[hidden email]> wrote:

> Wayne,
>
> Is that "automated RX GAIN procedure" the same as the one the K3 Utility walks you through?

Yes.

> I did it only on 20 meters: Is there any reason to do it on more than one band?

No.

Wayne
N6kR

>
> Phil W7OX
>
> On 3/7/15 9:55 PM, Wayne Burdick wrote:
>> Pierre <[hidden email]>
>> wrote:
>>
>>
>>> Sherwood's List now shows 0.27 and 0.20 uV for the K3 (w/New Synthesizer) ...which compares very well to the 'original' K3.
>>>
>>
>> Yes....In our haste, we sent Rob a K3 with new synths but uncalibrated RX gain. Now that the automated RX GAIN procedure has been completed, this K3 behaves normally.
>>
>> 73,
>> Wayne
>> N6KR
>>
>
>
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