The Flex design is completely exposed to strong in band signals. That
is a well known problem with both their original QSD and current DDC
designs. Simply put, they can't handle ADC overflow. That will always
be a problem for SDRs with wide front ends in high RF environments.
The K3 and Orion transmitters have much less spurious (particularly
transmitted phase noise from the K3) than most other transceivers while
the Flex is one of the dirtiest according to ARRL Labs.
73,
... Joe, W4TV
On 2015-07-01 7:49 AM, N1EU wrote:
joemoffatt wrote
The K3 and Orion absolutely crushed the Flex's. The Flex's got destroyed
by in band interference from the CW guys, but we never heard them.
I don't think you can necessarily make that conclusion without further
testing. If the K3/Orion transmitters had significantly more spurious tx
products than the Flex transmitters, that could also explain why the Flex
receivers seemed impaired compared to the K3/Orion. I'm not suggesting that
was the case, but you need more data to reach a conclusion.
73, Barry N1EU
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