HI report de test complet de Adam VA7OJ/AB4OJ
http://www.ab4oj.com/sdr/flex/6700rev1_38_notes.pdfTable 7. TX IMD in dBc (ref. 1 of 2 equal tones) at 100W PEP.
Freq. MHz
1.9 3.6 7.1 14.1 28.4 50.1
IMD order
3rd -27 -34 -46 -37 -31 -38
5th -47 -39 -36 -36 -39 -31
7th -53 -42 -42 -44 -42 -44
9th -53 -46 -49 -46 -46 -69
Add 6 dB for IMD ref. 2-tone PEP.
I found on-air handling of the radio very easy and intuitive. Tuning in a station with the mouse
wheel was quite convenient, although for my own use I would add a tuning-knob accessory. The
combined spectrum-scope and waterfall presentation is first-class – superior to any other SDR I
have used – and I found point-and-click selection of the desired signal, with “zeroing-in” via the
mouse wheel, a very useful feature. A station with excessively wide SSB audio and a number of
in-band artifacts had “no place to hide” from the 6700’s lab-quality scope.
Adjacent-channel rejection and overall receive audio quality were superb; the DSP detection-
channel filters are “brick-wall”, as is the SSB transmit filter. I also found NR fairly effective; it
lowered the band-noise level but did not degrade the audio. There was no impulse noise on
which to test the NB on-air.
The 6700 appeared to “pull up” weak SSB signals with somewhat greater clarity than my
conventional transceiver. In addition, in the absence of signals I found the receiver subjectively
very quiet.
