Rf amp yes or no ?

[Col@home]

hi guys I have been running tar1090 to get graphs now i have the pi hut 60cm up now with its base at 8mtr and running the saw amp as before my Rader number is T-EGUA71 on FR24 and heywatsthat I am getting around 220 nm average with 140 max if you look at haywats this i should be getting 350 nm, the gain on the tar1090 graph was set using the auto gain with tar1090.
if somebody who know what the graphs mean can tell me any thing they see that maybe the reason for the nm shortfall I would really be grateful, and will the cavity filter make that much difference and what are the cavity filters that are just a board with gaps ?
1.jpg2.jpg3.jpg4.jpg

[Col@home]

by the way please ignore the blue circle on tar1090 was a mistake.

[wiedehopf]

Are you sure about your heywhatsthat?
The blue circle might just be correct after all.

What exact parts are you using currently?

If you're min maxing, uputronics filtered LNA + airspy mini is a good setup.
Add one either a 5 or 8 vinnant antenna and you should get pretty much all you can get.
If there is strong interference you'll also need a cavity filter.

[Col@home]

I have the pihut 60cm ads-b Antenor @ 6mtr my co-ordinance are 51.902075 -1.164765 with an elevation of 84mtr above sea level, 5mtr rj58 coax connected to ADS-B Active SAW Filter&LNA SMA Connectors Low Noise Amplifier 21dB and NooElec NESDR Mini (TV28T v2) USB RTL-SDR, DVB-T & ADS-B Receiver, my radar is T-EGUA71 and my panorama is https://www.heywhatsthat.com/?view=MQWV268F
I currently receive 2,000 messages per second and max range of 250nm with average of 213nm, heywatsthatt says I should get around 600km or 340nm.also after installing tar1090 my fr24 feeder changed from default dvbt to mode s beast it also has this setting --net --gain -10 --lat 51.9017 --lon -1.1643 hopefully that is correct.
Im not at all interested in ranking, but if heywatsthatt is accurate and I should be able to see an aircraft at 30,000 ft 350nm away I would like to do my best to receive that.
I have 3 mobile phone masts within 0.6km of my location, I was hoping from the graphs above someone could tell me if my reception, signal and noise are good or bad and what my best option is.
Thank you
Colin

[wiedehopf]

I'm not sure where you get the 350 nmi from, that's just incorrect.
The panorama you linked suggests a range of roughly 270 miles which is 234 nmi.
This agrees nicely with the numbers in graphs1090 (fr24 reported max range isn't useful in my opinion).


The blue heywhatsthat outline in your tar1090 screenshots looks exactly like it should by the way.

image.png

[Col@home]

This is strange as @30000 it shows me more distance see my screen shot.

Screenshot_20241115_121311_Edge.jpg

[wiedehopf]

You've set it to 30000 meters as you switched to metric.

The site doesn't seem to recalculate the 'up in the air' immediately when switching US / Metric but if you click the 'up in the air' button twice it will update to the changed units.

[Col@home]

Arr that makes sense then so everything for my radar looks good then.

[Col@home]

Wiedehopf
Thanks for your help and also for creating tar1090 I love the radar view and im sure the graphs will make more sense to me when i learn a little more about db and dbfs.
in the mean time do my graphs look like a cavity filter would be of any use to me?

thanks
colin