Comparison: K3 and SDR 5000A

[John Wiener]

I would like to hear from my fellow Elecraft fans regarding general  
impressions of the K3 versus the SDR 5000A, software defined radio.
Just as in the Elecraft reflector, FlexRadio has some very stout  
supporters.  I hope this topic is not inappropriate.  Just interesting.

John
AB8O
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[John A. McCabe]

Hi John,

Although I do not have a 5000, I do have a SDR-1000. Elecraft and Flex
are both Good companies that produce great radios. However, I believe
one major difference between the K3 and the Flex 5000 will be in wider
space dynamic range. The close-in 2Khz dynamic range for the 5000 I
believe was measured by Rob Sherwood at 96db which is a good number.
But  the 5000 does not have roofing filters, so if I am not mistaken,
the 96db IMD dynamic range will the same at 2Khz, 5Khz, 10Khz, 20Khz,
and beyond,  as it is with most sound card based SDR's.  To me a 96db
Dynamic range beyond 20Khz is not good. I believe that a 96DB dynamic
range is around 40-45db over S9, so if my calculations are correct, IMD
could be a problem from a 45db over S9 signal 20Khz or more away. That
is one of the reason's why I chose the K3 over the 5000. The K3's close
in numbers will be around the same is the 5000, but the wider spaced
measurements I expect to be much better then the Flex-5000.


John, KD8K
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