Well, I did update and there where zero messages recorded, waited a few hours.
Now I reverted to mutability branch and immediately messages appeared. No planes are visible as of yet.
Should I mention that I am using dump1090-fa?
I am using dump1090-fa (Piaware SD card image), and have installed dump978 yesterday using JP’s script. Zero messages here too. Will try dump978 on Raspbian Stretch + dump1090-mutability.
Burned microSD card with Piaware SD card img 3.5.3
Booted and checked folder /var/www/html/
pi@piaware:~$ ls /var/www/html index.html index.js index.lighttpd.html lib logo.gif translations
STEP-2:
Ran JP’s script and installed ONLY dump978.
Checked, MAP NOT showing.
Checked folders. The folder dump978 is created and contains folder data, BUT NO MAP FILES
pi@piaware:~$ ls /var/www/html
dump978 index.js lib translations
index.html index.lighttpd.html logo.gif
pi@piaware:~$ ls /var/www/html/dump978
data
pi@piaware:~$ ls /var/www/html/dump978/data
aircraft.json receiver.json
STEP-3:
Again ran JP’s script and installed Web Portal.
Checked again, all the necessary files for MAP are now available
pi@piaware:~/adsb-receiver$ ls /var/www/html
admin dump1090.php graphs.php lib templates
api dump978 index.html logo.gif translations
blog.php dump978.php index.js plot.php
classes flights.php index.php post.php
data graphs install system.php
pi@piaware:~/adsb-receiver$ ls /var/www/html/dump978
config.js dbloader.js gmap.html ol3 style.css
coolclock flags.js jquery planeObject.js
data flags-tiny layers.js script.js
db formatter.js markers.js spinny.gif
pi@piaware:~/adsb-receiver$ ls /var/www/html/dump978/data
aircraft.json receiver.json
STEP-4:
(1) Configured Web Portal by going to page IP-OF-PI/install
(2) Edited file config.js and changed SiteShow = false; to SiteShow = true;
Are you using my branch? If so can you see RSSI measurements in the dump978 map? It’s working great here as seen below. These even come through to the dump1090-fa map.
No, I am still at JP’s.
The problem is that there is zero UAT traffic here (Toronto) since yesterday (when I installed dump978), so I cannot judge how it works, and if I go to your branch, how it will improve.
Now I need a better antenna for 978MHz. Right now I have a Pepsi can with a paper clip sticking up.
Hmmm… I wonder what’s the bandwidth of the FA 1090 antenna?
“In the SWR test both antennas had excellent SWR at around 1090 MHz, with both Adam’s antenna and the FlightAware antenna being about 1.15. The FlightAware antenna however has pretty poor SWR of ~10 at 978 MHz, so it may not be so good for UAT reception at 978 MHz. Adam’s antenna has a much better SWR of 2.0 at 978 MHz.”
It does not answer your question directly, but it’s likely enough info, if your plan was to use the FA antenna for UAT.
Whe I was experimenting with receivers and filters and amplifiers and I wanted to ensure I was comparing the same signal into each system I used one of these
Without amplification those loss figures are impossible. Most likely that is in addition to the 3dB from splitting the signal in half. So that makes the loss figures 3.3dB and 3.4dB. Minicircuits quotes their loss figures the same way. Still good though for a 2-way splitter.
I just updated.
downloaded the files to a new dir, did a make and copied the executable files over the existing ones.
I now get RSSI. Will make gain optimisation so much easier.
I have one RTL-SDR connected to a DPD antenna with the hab/nevis amp powered by bias-t(Hardware mod). The other one is the FA pro stick(without the filter) feeding a directional skymaster antenna.
Range is limited as I am low and UAT978 aircraft tend to fly low.
Great to hear that it seems to be working. Gain is tricky as they can go from weak to strong very quickly due to the elevations most of the aircraft fly at. I can get some that are 150 miles away but those are ones that are up at 30k+.
I have a small wifi like antenna designed for 978 (similar to Nooelec - 978MHz UAT ADS-B Antenna, 5dBi (High Gain), SMA) sitting about 20 feet off the ground running to a FA filter and then a FA prostick. I’ve found upper 30’s in gain seem to be best for that setup but it’s pretty variable depending on the level of activity.
With the amount of traffic I know there aren’t a lot of people using this but I got tired of not being able to easily tell if the signals were weak or strong and decided to add it. I hope others can get some use from it.
That’s correct, living next to a big airport you won’t see too much UAT traffic, they usually can’t afford the fees. The small planes tend to go to smaller airports, and because they fly so low, it’s harder to “see” them.
Plus, I see a lot of small planes being equipped with ADS-B, bypassing UAT completely.
I have seen posts in the past about NOT using AGC.
One user tested it and found it worked well for them(on 1090Mhz) as they are in a quiet location.
I live under the KLGA arrival path and next to the Hudson River SFRA so get way too much traffic to do this.
978UAT is another thing. It is often quiet, especially when the weather is bad.
I thought I would give AGC a go. There are no secondary radar responses so I thought it may help.
It seems to work well. My range seems to have improved a little. It has only been one day so I will have to let it go for a while longer before making any conclusions.
It’ll depend on the installation. In my case, if I use AGC, I get a single line between 0 and -3 dbfs, and no decodes whatsoever.
On the other hand, if I lower the gain, there are some very weak decodes. I tried 20.7 again yesterday. The noise line was around -35 dbfs. I saw a plane with a -49.5 signal. I’m inclined to believe it was not real, but it tracked okay for a period of time. Past posts here on the forum mentioned that the dongles/sticks are good up to -30 dbfs.
Anybody has more info about how ‘low’ will they go?