Barry N1EU wrote:
Alexander Ponomarenko-5 wrote:
yes PHONES-OUT on front panel(!!!) is different from rear panel PHONES
or LINE OUT outs.
The plots from front-panel phones-out is better, but IMD spikes are
present.
plot withoot S9 signal: http://forum.cqham.ru/download.php?id=32055
S9 PRE On AGC Off: http://forum.cqham.ru/download.php?id=32057
S9 PRE On AGC SLOW: http://forum.cqham.ru/download.php?id=32056
Thanks for running the test again Alex!
First off, is this really IMD we're looking at? Aren't you injecting a
single signal? Isn't this harmonic distortion, not IMD?
Looking at the s9 agc off pre on plot, the worst "distortion" product is
still >60dB down. It would be nice if we saw zero distortion products, but
I suspect that the distortion seen here is completely inaudible.
73,
Barry N1EU
Barry,
now I have only one-tone generator XG1 with S3 and S9 level.
But in my first message you can to see TWO-TONE in-band IMD
results for ic7800, ic756pro2, Flex-5k and K3 for S9 and S9+50 levels.
For all these Radios was used same measure-method on one table.
And of course AF-out for all it was from PHONES-out on FP.
s9+50 AGC-Fast PRE-On http://forum.cqham.ru/download.php?id=32004
s9 AGC-Fast PRE-On http://forum.cqham.ru/download.php?id=32004
These results from Alex UR0ID. The FireBox sound-card are no been
overloaded.
But hope I get two-tone generator from Alex, and also check my K3 for
two-tone IMD.
Alex de UR5LAM
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