UltraWideBand antenna design

Discuss commercial and home made antennas.
HighSNR
Posts: 14
Joined: Mon Sep 18, 2017 8:14 am

Re: UltraWideBand antenna design

Post by HighSNR » Mon May 07, 2018 10:07 am

Hi, sorry for the delay. Its a 1/4-20 UNC thread. Its the standard thread for most tripods and cameras.

Username
Posts: 273
Joined: Sun Oct 09, 2016 7:27 am

Re: UltraWideBand antenna design

Post by Username » Mon May 07, 2018 10:42 am

And why does the 2 Antenna who come in the Set look different?
What is different between them? :oops:

Username
Posts: 273
Joined: Sun Oct 09, 2016 7:27 am

Re: UltraWideBand antenna design

Post by Username » Fri May 11, 2018 4:28 pm

:D Today the Antenna arrived!

Username
Posts: 273
Joined: Sun Oct 09, 2016 7:27 am

Re: UltraWideBand antenna design

Post by Username » Sun May 13, 2018 3:36 pm

I play arround and... :roll: Cant receive anything than Cellphone Signals.
What was the intention of the Antenna?

rtlsdrblog
Site Admin
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Re: UltraWideBand antenna design

Post by rtlsdrblog » Tue May 15, 2018 5:33 am

It's advertised to work from 800MHz up to about 6GHz. So you could probably receive ADS-B and Inmarsat signals with it. Although those L-band freqs may require an LNA to get the noise figure down.

Username
Posts: 273
Joined: Sun Oct 09, 2016 7:27 am

Re: UltraWideBand antenna design

Post by Username » Fri May 18, 2018 9:00 am

So you could probably receive ADS-B
sure for demo purpose it work.
and Inmarsat signals with it. Although those L-band freqs may require an LNA to get the noise figure down.
oke I try an LNA but without I received nothing! :lol:

HighSNR
Posts: 14
Joined: Mon Sep 18, 2017 8:14 am

Re: UltraWideBand antenna design

Post by HighSNR » Sun May 20, 2018 11:32 am

It should work pretty well for ADS-B

Its not very directional below about 1.7GHz so it wont be good for Lband sigbals that need high gain. It would work ok for GPS or Iridium/thurays etc(i.e. systems that use a LEO or MEO satellite). I think INMARSAT normally works with a high gain antenna pointing at the GEO satellite.

Username
Posts: 273
Joined: Sun Oct 09, 2016 7:27 am

Re: UltraWideBand antenna design

Post by Username » Sun May 20, 2018 4:57 pm

It should work pretty well for ADS-B
The Work but my cheap ADSB Antenna do a better Job.
It would work ok for GPS or Iridium/thurays etc(i.e. systems that use a LEO or MEO satellite). I think INMARSAT normally works with a high gain antenna pointing at the GEO satellite.
I will try it with my Laptop today or tomorrow but I dont know if my LNA who I have at home are good for that Freq range. I connected it just with my Chinese HackRF. :lol:

HighSNR
Posts: 14
Joined: Mon Sep 18, 2017 8:14 am

Re: UltraWideBand antenna design

Post by HighSNR » Sun May 20, 2018 6:46 pm

Your cheap ADS-B antenna is will help filter out out of band signals. A bit like having a bandpass filter built in. With the UWB antenna there will be lots of other strong signals getting into the front end of the HackRF. This will lift the noise floor. The hackRF, while a great SDR for the money, isnt the best SDR for blocking out of band signals.

I presume you are just looking on a waterfall plot. You wont see GPS on that as it sits below thr noise floor. Iridium and Thuraya might be visible though, but probably only a few dB above the noise.

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