Re: #LimeSDR Transmit Anomaly #limesdr
he see wobble also with no beacon lock ... (but then additional drifting)
please please ... do NOT use offset ... if there IS a spur ...
you see it in your own if display (next to your passband) and you
just do another tx calibrate (and spur should be gone or a lot
lower) ... if you use offset ... then you may send the spur
without notice (but may disturb on anotherones frequency) ... so
best is to set that to 0hz ... and in case you see your own spur
do a tx calibrate (do NOT FORGET TO SWITCH OFF AMP!!) ...
jose also measured how clean (or not) the lime is with different levels ... and he also wrote to stay 10 db or more below max power (and use another lna in the chain) ... in that level range gain is cheap :-) ... i use a skyworks65017 for around 20 db gain from 0.1 to 6 gig ... VERY nice broadband amp for a few mw out
first pic is jose
secondand third is my pluto ... first half with beacon lock on
and second half beacon lock off
lnb is only tcxo modded and tcxo is INSIDE lnb but we have almost stable temp outside (cloudy and only a tiny bit of wind) so lnb drift is low
spectrum set to x8 resolution and 20 lines/sec on waterfall speed in first and 10 lines/sec on second picture
compare that with what jose sees ... his signal wobbles a lot more even if i do not count the maximum swings (100hz) but only the mean swings up and down (say 30 hz or so) ...
so all lime and maybe also pluto users ... please post a screenshot ... resolution x8 .. 10 to 20 lines wf speed and max zoom ... so we can compare the results (internal and external reference welcome)
joe ... may you also do the same test and post a screenshot??
greetz sigi dg9bfc
Am 30.05.2020 um 15:36 schrieb josephlevy via groups.io:
Hi Jose and Sigi