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K3: Sherwood Receiver Test Data question

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K3: Sherwood Receiver Test Data question

Please advise if I am reading the new Sherwood receiver data correctly:

1) it shows a nice 6-8dB improvement in 3rd order dynamic range after
adding the new synthesizer?

2) it shows that the K3's sensitivity has been greatly reduced from the
original 0.33 & 0.19 to 0.8 & 0.5 after the addition of the new synthesizer?
If this is true, this would be bad news for weak signal 6 & 10-m.
reception.

73,
Dick- K9OM
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wayne burdick

Re: K3: Sherwood Receiver Test Data question

Administrator

Dick,

The "sensitivity" number is incorrect because the K3 Rob tested didn't have its S-meter and AGC calibrated. He's going to re-test this after the unit is calibrated. We tested a few K3s with new synths in our lab, and all of them had sensitivity very close to the first K3 Rob tested.

On the contrary, the new synth reduces noise considerably over the old (as much as 20 dB lower noise at a 2-kHz offset), which only benefit all measurements.

73,
Wayne
N6KR

On Mar 4, 2015, at 8:56 PM, Dick via Elecraft <[hidden email]> wrote:

>
> Please advise if I am reading the new Sherwood receiver data correctly:
>
> 1) it shows a nice 6-8dB improvement in 3rd order dynamic range after
> adding the new synthesizer?
>
> 2) it shows that the K3's sensitivity has been greatly reduced from the
> original 0.33 & 0.19 to 0.8 & 0.5 after the addition of the new synthesizer?
> If this is true, this would be bad news for weak signal 6 & 10-m.
> reception.
>
> 73,
> Dick- K9OM
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

joemoffatt

Re: K3: Sherwood Receiver Test Data question

I can't speak to what the old was like. I just got my K3 built a few days ago and it is brand new with the new board.

I had a Flex-5000a and a 6300 I have access too. I am an avid DXer with very marginal antennas. Last night in the CWT, I hit my highest rate ever and I am blown away with this receiver. The sound and feel is incredible. I have never had a radio this good. It is hard to.describe, but it is amazing.

73 to all,

Joe

-------- Original message --------
From: Wayne Burdick <[hidden email]>
Date: 03/04/2015 11:46 PM (GMT-06:00)
To: [hidden email]
Cc: [hidden email]
Subject: Re: [Elecraft] K3: Sherwood Receiver Test Data question

Dick,

The "sensitivity" number is incorrect because the K3 Rob tested didn't have its S-meter and AGC calibrated. He's going to re-test this after the unit is calibrated. We tested a few K3s with new synths in our lab, and all of them had sensitivity very close to the first K3 Rob tested.

On the contrary, the new synth reduces noise considerably over the old (as much as 20 dB lower noise at a 2-kHz offset), which only benefit all measurements.

73,
Wayne
N6KR

On Mar 4, 2015, at 8:56 PM, Dick via Elecraft <[hidden email]><mailto:[hidden email]>> wrote:

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Gary Smith-2

Re: K3: Sherwood Receiver Test Data question

Joe,

You will be a happy guy with the new K3. Mine is 6 years old but has
all the upgrades done here & at the factory so it's the same radio as
yours, and the new K3 is incredible. If you don't have the sub
receiver, plan on putting that in, diversity is a hoot.

73,

Gary
KA1J

> I can't speak to what the old was like. I just got my K3 built a few days ago and it is brand new with the new board.
>
> I had a Flex-5000a and a 6300 I have access too. I am an avid DXer with very marginal antennas. Last night in the CWT, I hit my highest rate ever and I am blown away with this receiver. The sound and feel is incredible. I have never had a radio this good. It is hard to.describe, but it is amazing.
>
> 73 to all,
>
> Joe
>
>
> -------- Original message --------
> From: Wayne Burdick <[hidden email]>
> Date: 03/04/2015 11:46 PM (GMT-06:00)
> To: [hidden email]
> Cc: [hidden email]
> Subject: Re: [Elecraft] K3: Sherwood Receiver Test Data question
>
> Dick,
>
> The "sensitivity" number is incorrect because the K3 Rob tested didn't have its S-meter and AGC calibrated. He's going to re-test this after the unit is calibrated. We tested a few K3s with new synths in our lab, and all of them had sensitivity very close to the first K3 Rob tested.
>
> On the contrary, the new synth reduces noise considerably over the old (as much as 20 dB lower noise at a 2-kHz offset), which only benefit all measurements.
>
> 73,
> Wayne
> N6KR
>
>
> On Mar 4, 2015, at 8:56 PM, Dick via Elecraft <[hidden email]><mailto:[hidden email]>> wrote:
>
> >
> > Please advise if I am reading the new Sherwood receiver data correctly:
> >
> > 1) it shows a nice 6-8dB improvement in 3rd order dynamic range after
> > adding the new synthesizer?
> >
> > 2) it shows that the K3's sensitivity has been greatly reduced from the
> > original 0.33 & 0.19 to 0.8 & 0.5 after the addition of the new synthesizer?
> > If this is true, this would be bad news for weak signal 6 & 10-m.
> > reception.
> >
> > 73,
> > Dick- K9OM
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]<mailto:[hidden email]>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
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