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re-reading your original post, did you align your dish with your L band antenna,
this is what I do, I fix my L band helix in place of the LNB and carry out basic
alignment and then put the LNB back in place.
usually have to tweak the alignment to maximise the C-band signal. I take my
receiving laptop outside and have it next to my dish and watch the signal
strength as I tweaking.
precision, yes with a 1.1m dish the signal is weak at best so you do have to be
accurate, I find just 2 or 3 degrees off can make a big difference - I also
notice on my off set dish, the indicator scale on the dish has no relation to
reality, it's showing around 30 deg elevation when it's actually pointing
around 10 degrees - by looks alone the dish appears to be pointing into the
ground but this is a feature of being "off set".
help you with the testing of the LNB but the increase in noise level when you
apply power must be a good sign, I get the same effect
you have better luck today, as I write this I have around 50 aircraft showing on
my Plane Plotter map - all from my own data.
26/12/2018 at 21:50, Patrick Lindecker <f6cte@...
for the advice.
I tried to reverse polarity, but there was no effect ( I tried also to remove
the dielectric without any effect).
tried this afternoon. But I received the L band transmissions so I suppose
that I could have received the C band.
wonder if my LNB works. But it is difficult to test it because 3.6 GHz sources
are rare. ☺
>as you have the dish aligned
I have a compass for azimuth and a
setting at about 10 ° of elevation is not a big problem (there is a raw
indicator of the dish). My alignment was perhaps at +/-5 ° maximum, in azimuth
and elevation, but I don’t think it needs to be extremely precise (in general
I get a first signal and then try to adjust elevation and azimuth so to have
the maximum signal). But here I had no signal at all.
email@example.com [mailto:firstname.lastname@example.org] De la part de Paul
Envoyé : mercredi 26 décembre 2018
À : email@example.com
Objet : Re:
[multipsk] Reception of C band - Problem #AERO
I've been receiving 3F5 all day so I can confirm
there is no problem with the satellite.
Have you tried reversing the polarity, applying 12 volts
instead of 18. I notice if the dielectric is in the wrong slots within the lnb
this has the same effect as changing the voltage. Ie reversing the
I can't think of anything else that could cause the
problem as you have the dish aligned correctly.
What time of day did you try? I always find the strongest
signal is when the satellite is above the equator, at the moment between 06.00
and 12.00 gmt
On Wed, 26 Dec 2018, 17:05 Patrick Lindecker <f6cte@...
I tried to receive C band from 3F5, with a 1.1 m diameter dish, applying the
diagram (for a possible “Easy” document), below.
received absolutely no signal on the expected C band frequencies (tested
with SDR# and Multipsk). I checked that I could receive L band signals from
this satellite (with the same RTL/SDR receiver, a LNA and a patch antenna)
and this works well.
checked the voltage on the LNBF which was correct (about 18 V but it’s true
that I did not checked the quality of the filtering). If you have ideas of
possible causes of problem, don’t hesitate.
when I switched on the LNBF with the 18 V, the level on the SDR# waterfall
increases of about 10 dB (which is reassuring).
de virus dans ce courrier électronique a été vérifiée par le logiciel