I started another thread in this forum titled "Simple ADSB Hardwware question" I started a new thread because this is kind of the results of that topic.
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So after a lot of testing and trying different combinations of filters and various ADSB devices this is what I learned:
1) The E4000 DVB TV Dongle does a nice job of processing ADSB.
2) Filtering is the key
3) A nice antenna high up is key.
This one works well for me http://www.anteni.net/adsb/#!/~/product/category=3647502&id=15504149
4) A low noise amp helped tremendously.
a. http://lna4all.blogspot.com/
My location had a lot of RF interference around 1090mhz but I couldn't ID the exact culprit. I tried 1000mhz high pass filters, 1300mhz low pass filters, SAW filters, and a 1065mhz bandpass filter from mini-circuits (VBFZ-1065+). I learned that insertion loss can cost you 10 – 15% framerates. Without any filtering, framerates were very poor.
I found that most of my RF interference was coming from a local strong APCO digital network operating around 895mhz. Why it was bleeding over to 1090 ??? but nothing else was showing up on the spectrum analyzer of significance < 1090 mhz. I have a Wifi Network that is blasting away at 2400 mhz but that doesn't seem to effect my setup.
I tried a custom made 1090 SAW filter but found it way too tight and choked the signal almost completely. I tried a combination 1000mhz HPF and 1300mhzLPF prior to the LNA (Low Noise Amp) and the results were excellent. I then tried taking the 1300mhzLPF out of the setup and framerates increased another 15% (must have been insertion loss issue??) I guess no noise > 1090 was degrading my ADSB signals. The minicircuits 1065 band bass filter matched the performance of my 1000hpf/1300lpf combination.
I think everybody's RF situation is different so you'll just have to try different filter combinations, I'd say don't make your filtering too tight or you'll choke out the ADSB (personally 50 - 100mhz either side of 1090 would be about right IMHO) Two filters = more insertion loss.
My setup is the E4000 DVB Dongle with the above mentioned antenna.
Antenna > 1000mhz HPF > LNA4ALL > E4000 DVB Dongle > ADSBSharp
I'm getting 200 miles in all quadrants and framerates > 25,000 / minute at peak times. Not sure if that would improve much with a Mode-S Beast or SBS-3 but for the $$$, I'm in the ballpark.
Cheers :)
Thanks for the report, really helpful.
If you're getting 200 miles (statute or nautical?) in all quadrants, you are doing well.
I get similar range on an external antenna with all types of receivers. The antenna location is important.
RTL 1090 configurations to Software
Would some one share their configurations?
USB for base station, port settings and so forth, can't seem to get it to work
Thanks
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I think you need to be running a utility to use Basestation with a DVB-T receiver?
I was hoping it would be an easy fix, I guess I will have to dig deeper and get my degree.
Thanks Anmer
I know Anmer is not in favo(u)r of this but ....
http://f5ann.pagesperso-orange.fr/DongleavecBasestation/index.html
Might give you some clues.
Tim
Triple7 beat me to it ;)
Actually those instructions have wider interest - if only I could figure out which combination of TCP/COM/COM would allow the original Globe-S mini to receive data from TCP. Might also help with the ADSBScope ongoing thread.
Quote from: Triple7 on November 10, 2013, 08:40:17 PM
I know Anmer is not in favo(u)r of this but ....
http://f5ann.pagesperso-orange.fr/DongleavecBasestation/index.html
Might give you some clues.
Tim
That's the link I was thinking about when I said Ill get a degree.
I will give it my full attention tomorrow....................... Thanks Triple7 / IanH
RTL1090 should be started in April fashion:
April fashion - well its November now what!
Got adsbScope to work, never had this range before 250+ with supplied 2 inch antenna also checked with flightaware for a reference.
Globe-S mini now working with planes on the ground, hope to switch to loft antenna this weekend, not sure if I can get the 4 to 5 step process going for Basestation, to much mickey mouse on that one.
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Hi people,
I was an user of SBS-1 and RB since 2007 here in brazil.
Nowadays getting a lot of fun playing around with dongles + RPI
Made in the past several 10 stacked dipoles coax-col antnnaes, newadays i made this one for RTL : http://www.qsl.net/py4zbz/adsb.htm#e but since it was for putting it clamped to a window facing north stucture, i left the piggy-back inside a 20 mm PVC pipe and soldered 2 meters RG174 directly to the wires.
Picture two antennae follows and range achieved :
Best regards : Juan
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Thank you for that - it explains to me how to connect the receiver.
Looks like a simplified version of this:
http://www.lesaunier.com/htm/franklin1_eng.htm
And shakysen has been having a lot of success with that version - I just need time and materials to have a go.
Or perhaps someone else can try it out?
Hi IanH,
I used near 2 meters RG174 coax, one en directly soldered to antenna and crimped a MCX connector at the other end.
Yes, it seems something similar to http://www.lesaunier.com/htm/franklin1_eng.htm
Since 2007 i made lots of antennae, even one 21 stacked dipoles colinear coaxial that from iside my hose was able to receve ACs near 190 NM in some directions, but once installed o top of building happened thar every AC passing overhed or near, saturated the RadatBox in that way that for some time that all the farthest ACs droppped from screen.
So, in further testing .. concluded that the ideal size for my location was to made this kind of antennae only with 10 stached dipoles.
At this time i have 3 working fine since 2008... 2009, no problems at all.
Made also several yagis from 7 to 11 elements, but the testing sowed me several times that very high gain antennae are not needed for RTL dongle.
The only two more important things seemed me to be :
1- Clear line of sight
2- Few meters coax running.
11 elements yagi :
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