Hi Bill,
The ARRL has not published lab tests on the SDR-1000 to my knowledge,
but I do have one here in the lab.
Its an interesting approach for a 100% computer based rig and in general
its RX performance is not too bad, but is is well below the K2 for IMD
dynamic range and Blocking dynamic range.
It relies on the sound card in the PC to do all of its filtering, which
makes it's performance quite variable depending on what quality sound
card is in use and how it is set up by the user. In any case though, the
current PC sound cards do not have enough A/D input range to get the
same dynamic range performance as rigs (like the K2, Orion. etc) that
use narrow crystal filtering at their first IF.
It also uses a direct DDS based local oscillator (without a following
PLL to clean it up) for its VFO, which will have numerous significant
off freq spurious responses in the -80 to -90 dB range that will mix off
frequency signals onto your listening frequency. These spurious receive
components absolutely can not be canceled out by the DSP once they
occur. They look identical to legitimate on-frequency RX signals to the
DSP. As a comparison, the K2 and other top performing rigs have local
oscillator noise (with no spurs) at -125 to -130 dBc range five to ten
kHz from the carrier. A big difference.
Even more important, the direct DDS approach creates the same DDS off
freq. spurs on transmit. Not a great idea then running 1KW etc.
73, Eric WA6HHQ
Bill_Harris wrote:
Have there been any lab tests published comparing the SDR-1000 against the K-2?
Carry on
Bill_Harris
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