I'm just beginning to play around with a couple of ADS-B programs; Dump 1090 and RTL 1090. I've gotten both programs to work, but a question: How do I set my R820T dongle's PPM correction factor in RTL1090? (It's version 3.0.4.161)
RTL1090 question
- Thread starter W4KRR
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Although most have that option the version of RTL1090 I used to use did not either. Do you know the PPM of your SDR dongle? I can tell you that the bandwith is pretty high and does pretty well without a reasonable amount of correction.
Once you get going with your setup you should head over to adsbexchange.com and feed your data.
Are you using Virtual Radar Server? I have been at this ADS-B stuff for a year a so and having a lot of fun.
Another good place to learn is the FB page I am on. https://www.facebook.com/groups/476880835847288/
My dongle PPM correction factor is 54. I thought there should be a command line parameter to set the correction, but I can't find it mentioned in the online manual.
BTW, the online manual seems to be written for an earlier version, and as such there's a few differences in the instructions for the older interface vs. the new one.
No, I'm not using Virtual Radar; I had briefly experimented with it, as well as RTL1090, a long time ago, but I got sidetracked with other interests.
BTW, the online manual seems to be written for an earlier version, and as such there's a few differences in the instructions for the older interface vs. the new one.
No, I'm not using Virtual Radar; I had briefly experimented with it, as well as RTL1090, a long time ago, but I got sidetracked with other interests.
The command line argument would be --ppm54.
You will need something to feed your 1090 data into. VRS is a good choice.
good luck.
I currently use a non dedicated scanner antenna that's not tuned for 1090MHz. It works, but after running SBSPlotter for 12 hours, my maximum range was only 28 miles.
I also have a ground plane antenna tuned for 1090MHz that I will be installing. I am also looking for an in-line amplifier and power injector What is a good source for these? A Google search turns up a lot of choices and designs, but I don't want to buy something that won't work. Does Radio Shack have the necessary components?
I also have a ground plane antenna tuned for 1090MHz that I will be installing. I am also looking for an in-line amplifier and power injector What is a good source for these? A Google search turns up a lot of choices and designs, but I don't want to buy something that won't work. Does Radio Shack have the necessary components?
ki5gf
Member
Ken,
I use the following with my 5/8 wave ground plane:
DirecTV Power Inserter, model P121R1-03, 2-2150mhz, 21v
Paladin Tools #9672 In-line amp, 950-2300mhz, 12-18v
Both available thru Amazon
Even tho the power inserter is rated at 21v, the inline amp doesn't seem to mind the extra volt or 2.
Mine has worked great since August. The 5/8 wave ground plane is supposed to be approx. 300ohms (according to some web experts). I tried using an old TV converted to convert that 300ohms to 75 ohms but the DirecTV power inserter refused to work with it. So I'm just feeding everything with 75ohm stuff.
New RG-6 quad shield with amp near the antenna, coax to the shack (now at 125 feet), a short 6 inch
75ohm to 50ohm pigtail to the R820T2 rcvr. It all works pretty well as my current FlightAware stats
(user ID Sj) show.
I use the following with my 5/8 wave ground plane:
DirecTV Power Inserter, model P121R1-03, 2-2150mhz, 21v
Paladin Tools #9672 In-line amp, 950-2300mhz, 12-18v
Both available thru Amazon
Even tho the power inserter is rated at 21v, the inline amp doesn't seem to mind the extra volt or 2.
Mine has worked great since August. The 5/8 wave ground plane is supposed to be approx. 300ohms (according to some web experts). I tried using an old TV converted to convert that 300ohms to 75 ohms but the DirecTV power inserter refused to work with it. So I'm just feeding everything with 75ohm stuff.
New RG-6 quad shield with amp near the antenna, coax to the shack (now at 125 feet), a short 6 inch
75ohm to 50ohm pigtail to the R820T2 rcvr. It all works pretty well as my current FlightAware stats
(user ID Sj) show.
Thanks for the input Steve. I am now wondering if an amp would offer me much benefit, as my total run of coax will only be around 20 to 25 feet. I will be using Belden quad-shield RG-6 cable, and a Max System 800MHz ground plane antenna modified for 1090MHz.
ki5gf
Member
Ken,
There's only one way to find out -- try it and see. Each and every installation will be different. Everything
you have ever learned about antennas applies (and then some) when working at 1090mhz. All sorts of things that I never worried about when building for or working on HF have now become problems that need to be solved. Things like trees, power lines, metal objects, other antennas, coax adaptors, etc that have always affected HF operation now can become absolute killers at 1090mhz. Also, on the coax -- shorter is NOT always better. My setup works best with coax runs over 50feet long. I proved that to myself with 3 separate 2 week tests keeping daily stats. Using the exact same setup and only changing coax lengths. Stats using a 50ft coax averaged better than using a 25ft coax. Stats using 100ft coax were better that either the 25ft or 50ft lengths. Always the same type and grade of coax with factory-installed connectors.
There's only one way to find out -- try it and see. Each and every installation will be different. Everything
you have ever learned about antennas applies (and then some) when working at 1090mhz. All sorts of things that I never worried about when building for or working on HF have now become problems that need to be solved. Things like trees, power lines, metal objects, other antennas, coax adaptors, etc that have always affected HF operation now can become absolute killers at 1090mhz. Also, on the coax -- shorter is NOT always better. My setup works best with coax runs over 50feet long. I proved that to myself with 3 separate 2 week tests keeping daily stats. Using the exact same setup and only changing coax lengths. Stats using a 50ft coax averaged better than using a 25ft coax. Stats using 100ft coax were better that either the 25ft or 50ft lengths. Always the same type and grade of coax with factory-installed connectors.
For as cheap as it is give it a shot. I use the setup Steve listed except the amp is a different brand. My coverage did expand, my plane and message count doubled. I'll never forget watching the screen when I plugged it in. It came to life. There is a great forum on Flightaware.com with a ton of info also. Also, if you FB then come on over to https://www.facebook.com/groups/476880835847288/
Good discussion on ads-b and dump1090.
Adsbexchange.com is a site with unfiltered flights. Pretty neat.
This is my range. Typically.
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