You may have just sold me on a KDSP2 down the road Eric. I just ran some
tests on my "new used" K2 (#568), and to cut to the chase... I measured
ultimate rejection out 5 kHz as 80dB with the KSB2 OP1 filter in, better
than you indicated. But with FL2, which is set for 1.8 kHz, I measured
115dB. Is this a result of the KSB2 being outboard?
Larry N8LP
Eric Swartz - WA6HHQ, Elecraft wrote:
We designed the KDSP2 to improve ultimate SSB filter ultimate
rejection in the K2.
The KDSP2, with its brick wall SSB filter settings, when cascaded
after the KSB2 filter, totally eliminates any residual leakage from
strong signals outside the passband. It also tightens the net filter
shape factor. The ultimate rejection is 60-75 dB on the xtal filter,
which means a strong residual off freq. signal will not activate the
K2's AGC, allowing the DSP to do its job without signal degradation.
This is how I run my K2 and I hear no difference with strong off
frequency signal blow-by between it and the other $3K+ rigs we have in
the lab. :-)
73, Eric WA6HHQ
Larry Phipps wrote:
Sounds like the age old debate in the hifi world about the "sweet"
sound of tube amplifiers vs. the "hard" sound of clearly superior
modern solid state amps.
Preferences aside about slopes and shape factors... I'd like to have
MUCH better ultimate rejection... and a true rf clipper would be a
nice addition, especially when using QRP.
Larry N8LP
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