N2TK:
- Better close in (2KHZ) dynamic range performance.
AA4LR:
For the price, the K2 has one of the best dynamic range figures, even close in.
K2's IMD degrades 24 dB from 5 kHz to 1 kHz,
primarily due to phase noise.
IMD @ 5 kHz 91 dB (ARRL)
IMD @ 2 kHz 80 dB* (Sherwood)
IMD @ 1 kHz 67 dB* (ARRL)
* = phase noise limited
Sources:
<http://www2.arrl.org/members-only/prodrev/pdf/lab/k2.pdf>http://www2.arrl.org/members-only/prodrev/pdf/lab/k2.pdf
(graph page 20)
<http://www.sherweng.com/table.html>http://www.sherweng.com/table.html
N2TK:
- Switchable front end filters
AA4LR:
Huh? The K2 is single-conversion. It isn't an up-conversion rig like
the Orion or the IC-7800, etc. There's no need for a front-end
roofing filter because the main filter IS the front-end roofing filter.
But Orion is not an up-conversion rig. Its
First IF is 9 MHz vs the K2's ~5 MHz. Up conversion
rigs typically have First IF at VHF (70 or 40 MHz).
"Until the Orion came out, 99% of modern transceivers were up
conversion radios. (K2 the exception)" Rob Sherwood
http://www.sherweng.com/Dayton_2004/Dayton_2004-Sherwood.pdf
73, Bill W4ZV
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