Not sure what you mean? What do you want to see?
something like the following (if you have it) - not a thorough check just a quick one
during high traffic period.
I use a v3 with only the jetvision.de antenna (~70e) elev 350 feet amsl, 4m coax 50ohm
no LNA.
seems with every lower setting there is a significant drop in aircraft count and range
which is not the case with prostick and cantenna on the other rpi same place 4m coax 75ohm sat coax.
Oh sure this is what mine looks like:
As you see i keep my peak quite a bit higher. As long as i donât see dotted lines of low level airplanes buzzing by one or two miles away i wonât decrease the gain. Mind you that is only the occasional GA aircraft mostly on the weekensds or every 3 days or so the police or rescue helicopter.
Which jetvision antenna do you use they sell quite a few?
thanks @wiedehopf
Is the SCO-1090.
Flightaware Antenna (in window) + 30 cm pigtail RG316 + FA Filter + Pro Stick
Gain =48.0
thanks @abcd567
what is strange is similar performance between the v3/fa-filter/jetv ant/cable 50ohm and prostick plus/cantenna/cable 75ohms but⌠with vastly different gain settings.
v3 is set at max and prostick at 37.2. (I try to stay close or on the red 3dbfs line.)
so is cantenna more sensitive or what ?
The cantenna is not more sensitive.
The pro stick has a LNA with 17 dB or so gain built in before the actual rtl chipset.
I would use the pro stick with the good antenna to be honest 
After seeing the âblood stainedâ 
graph, few minutes ago changed gain to 38.6. Will have to wait for an hour to see result.
Please see RSSI column at far-right
That many messages above -3dB is indeed impressive 
@abcd567 If you want to check it out i have pushed a new version of the colorized tracks (signalview) that now clearly shows with a change from violet to red if a plane goes above -2dBFS.
Also changed the message display to Messages per second (averaged over 4 seconds like the RSSI) so that you can see if the msgs/s drop when the gain goes above -2dBFS.
1 Like
yes I tried this and strangely enough results were worst 
I thought - maybe wrongly - the idea was to stay at or below the âred lineâ to avoid
saturation(?) also the blue and cyan lines seldom match let alone blue over cyan
but in my area canât get more than 70 aircraft at any given time.
You should use the filter also.
Then set the gain to 35 as a starting point.
But hey sometimes the prostick seems to not like high gain antennas i guess.
yes isnât it puzzling 
Here are graphs for the other PI
Mag-mount (cut to 67 mm, on a cookie-can, near window) + FA Filter + ProStick PLUS
GAIN = 48 (initially) then changed to -10 at 2 am
I meant dotted lines due to high signal not low signal.
You basically have to see the RSSI before and after the dotted line. If itâs above letâs say -3dBFS then you probably lost the plane because the signal got too strong.
So with your screenshots i actually donât know why the track drops off.
if for the yellow nearby aircraft maybe because of MLAT (?) for the distant onces most probably due to obstacles / mountains. have quite a few of these
Blue line is messages/s and Cyan line is Positions per second. The second one uses the right hand scale so they are not necessarily related.
In Central Europe the planes send a lot of messages so you get a lot of those but not necessarily many positions out of those messages.
If you keep the peak signal below the red line that will not be where your best performance is.
Looking at your signal level i doubt you would have interrupted tracks due to overdrive.
What setup / gain did you use with the prostick / jetvision antenna combo?
hello abcd567, can you advise how to run RRDTOOL on SD card install RPI (3.6.3)?
I kept the same gain 37.2