I love my K3/P3/SVGA and my KX3 as well. I do want to mention that the new
Flex 6000 series uses a 16-bit A/D, with over 245Ms/s sample clock, much
better than 100Ms/s. Processing gain is real, and should help the 16-bit
range somewhat, but 16-bits is not really 16-bits in the real world. Throw
away at least 1/2 bit, and maybe more.
It will be very interesting to see what a Flex 6000 series finally does in
various receive parameters, especially dynamic range. They claim to handle
a very large dynamic range, even without the various RF filters.
I can't wait to see the Sherwood report on the 6000 series.
73, Terry, WB4JFI
-----Original Message-----
From: Barry LaZar
Sent: Wednesday, March 13, 2013 10:13 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Wait For The K4 Direct RF Sampled SDR?
I'm sort of curious about what Flex is doing with their new radio. The
heart of it has to be a very good A/D converter, but the best thing I'm
aware of is an Analog Devices 16 bit, 100 Msp/s one that ain't exactly
cheap. To approach the dynamic range in the KX3 and the K3, 16 bits may
be a might short.
I, too, believe that direct sampling and high dynamic range is still a
bit off particularly if you want to be able to afford one. I like the
magic of my KX3 when used with NaP3 and a 24 bit, ASIO compliant sound
card. As a practical matter, it serves for the 95% situations. those
last five will include a lightning storm over my house or someone like
W3LPL moving next door.
73,
Barry
K3NDM
On 3/13/2013 9:49 AM, Wayne Burdick wrote:
No need to speculate. There is no such project underway at Elecraft.
Direct RF-sampling receivers, for all their technology, still lag well
behind the K3 in blocking dynamic range, and probably will continue to for
years to come. We're quite happy with our superhet architecture. Also, any
advancement we make to the K3 will be retrofittable to existing K3s, so
your investment is safe.
73,
Wayne
N6KR
On Mar 12, 2013, at 8:04 PM, Bob Schumacher wrote:
Given the advances in direct RF sampled SDRs (currently available QS1R,
soon to be released Flex-6000, etc.), Elecraft must be quietly working on
on an RF sampled K4 SDR. Maybe we will see an anouncement in May at
Dayton? I am wondering if I should take the leap with the Flex or wait
for Elecraft? I suspect that Elecraft will provide a higher value
solution. Any speculation on this point by Elecraft fans?
Thanks,
W9DBR
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