True I took my laptop running dump1090 with FA Pro stick to a high spot so that I could pick up a couple of Spitfires that were performing at a local event. Although they were visible there was no sign of them in my VRS aircraft list but I was receiving aircraft from long distance as I guess the data was being swamped.
Thanks for the tip. Do you think that will that give any measurable effect if the coax cable is only 2 meters long? If so, it’s worth to give it a try. If it’s only in theory, I would rather stay inside than climb on the roof again to replace the cable. 8)
I thought the Aircell 7 was a good option for this, as it is suitable for frequencies up to 6GHz.
Dump1090 Mutability is one of my next steps to do. Although… rumors about a new, improved, Piaware version made me wait for a while.
Thanks! I have tried different gain settings manually, but it’s hard to see any differences. Standard setting was -10 (auto gain control???). But I keep trying.
torroid chokes on the USB pigtails(if used) and power cables. May reduce noise.
A metal case for the FA Dongle and the RPI itself may also reduce noise.
Keep the RPI CPU cool. Mine drops MLAT when it gets too hot. A case with a fan fixed the issue.
Thanks! Cooling issues already have my attention. I ordered a metal case with fan for my Pi and I already have placed heatsinks. A metal case for the FA pro stick is a good one, and Chokes for the powercables too.
Aircell 7 appears to have roughly the same spec as any typical plenum rated RG6, commonly used by ADS-B’ers. Two meters of this cable probably gives less than .5 dB of loss at 1090. Inconsequential. The extra losses incurred by the changeover is not much either.
Sure, ideally, one should use 50 ohm high quality cable between the 50 ohm antenna and the 50 ohm-ish SMA port on the dongle. But, two meters of RG6 and two impedance changeovers isn’t going to be much different than two meters of LMR600 and a N to SMA changeover.
Height, a higher gain antenna, or maybe even try using a directional antenna pointed towards the ‘hottest’ region.
My present ADS-B collector is running with a 820T2 dongle, a 15 dB LNA (not a satellite inline amplifier), 15’ of LMR400, and a 5 dB antenna at about 50’ HAAT, no gain argument and no agc argument.
Aircell 7 gives a loss of 0,4 db whit 2 meter of it.
if you use a diferent cable you dont see de difrence.
the flightaware filter gives much more loss.
if you want more range the only thing you can do is the height of the antenne.
And find the correct settings whit the gain setting.
i always use planeplotter and look at the message rate and then play whit the gain settings when the gain is to hard the message rate drops .