New Sherwood Test for K3 & Flex 6700

[Bill W4ZV]

http://sherweng.com/table.html

Sounds like Rob is working on a new talk for Dayton...probably comparing testing of direct sampling vs traditional receivers.  Note the "ag" and "ah" footnotes for dynamic range (at both 2 & 20 kHz) at the bottom of the comparison chart.  New K3S result is #3 on the page and new 6700 result is #12 on the page.

ag DR3=96 dB with 20 dB Preamp ON. (99 dB Preamp OFF) Otherwise dynamic range independent of signal spacing.
NOTE: Testing of 2nd sample made on 10 meters while investigating IFSS* curves. Similar testing of 2nd sample of K3S, also made on 10 meters. * IFSS = Interference free signal strength.

ah NOTE: Testing of 2nd sample made on 10 meters while investigating IFSS* curves. Similar testing of 2nd sample of Flex Radio 6700, also made on 10 meters. * IFSS = Interference free signal strength.

73,  Bill  W4ZV

[Richard Lawn]

There has been a tremendous amount of flap, angst and drama on the Flex
users group about these results, so much so that Gerald got involved to try
and get to the bottom of it. Apparently there were some software changes
made with the last or previous SmartSDR upgrade that did some harm. They
know what happened apparently, which is way beyond my capability to
understand or explain, and are in the process of making the changes and
improvements Gerald found and these changes will be implemented in the next
SmartSDR version. I guess at that at some point Sherwood will re-run tests
and post new findings which hopefully will look like the much earlier
evaluations.

Rick, W2JAZ
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[Michael Walker]

Correct

And this is both the advantage and disadvantage of an SDR Receiver.
Mostly, it is a big advantage and the issues get caught by the software
test team.

The great news is that it is a simple software update away from being
resolved and is part and parcel of normal software product life cycle.

The sky is not falling.

73, Mike va3mw



On Sun, Apr 2, 2017 at 5:20 PM, Richard Lawn <[hidden email]> wrote:

> There has been a tremendous amount of flap, angst and drama on the Flex
> users group about these results, so much so that Gerald got involved to try
> and get to the bottom of it. Apparently there were some software changes
> made with the last or previous SmartSDR upgrade that did some harm. They
> know what happened apparently, which is way beyond my capability to
> understand or explain, and are in the process of making the changes and
> improvements Gerald found and these changes will be implemented in the next
> SmartSDR version. I guess at that at some point Sherwood will re-run tests
> and post new findings which hopefully will look like the much earlier
> evaluations.
>
> Rick, W2JAZ
> ______________________________________________________________
> 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]
>

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