Using Wifi antenna with RTL2832U+R820T dongle

[uts9880332719]

Hi All,

   I just received a RTL2832U+R820T dongle. But with stock antenna I am not able to receive any ADS-B signals. In order to increase

ADS-B can I use wifi (2.4ghz) antenna with mcx to sma adapter? Will it work?

Regards,

Uttam

[Priyasloka Arya]

Hi
Uttam if you are in India ADS-B will not be there.ACARS has limited presence.
Rgds
Priyasloka

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[jdow]

Not well. For ADS-B signals the wavelength is a bit less than 30 cm. So a
quarter wave whip is about 7.5 cm long. That would work better than the
stub that comes with the dongle. But it'd be a little inefficient,
especially inside. You might get better luck hacking up an outside antenna
with a modest LNA at its base. Even an outside discone will work nicely.
It will have the advantage of being useful for a lot of frequencies
rather than one. (Discones are very broad frequency range antennas.)
(Amplifier gain more than a few dB more than the loss in the coax
cable to get inside the house is counter-productive. It causes more
problems than it solves.)

Outside is best as it gets the antenna away from the computers and the
noise they generate and signals don't have to get through the walls of
your house. House walls can be pretty heavy signal attenuators.

{^_^} Joanne, W6MKU

[arv...@gmail.com]

Hello Priyasloka

I am curious about your statement regarding ACARS / ADS-B presence in India. http://www.flightradar24.com offers ADS-B coverage over Mumbai for example - I'm curious to know how they are doing that :-)

 

if you can clarify I would appreciate it!

[uts9880332719]

Hi Joanne,

   After placing the antenna outside, coverage has increased to ~250kms.

Regards,

Uttam

[Priyasloka Arya]

Hi

What i mean to say ADS-B ground stations are not available. But what i understand, few guys are uploading position data to flightradar site using their ADS-B receivers. If you are interested you could request ADS-B receiver set from flightradar. However, i  was unable to receive any ADS-B

signal in Bangalore using stock antenna provided with RTL SDR.

Thanks.

Priyasloka Arya  

[arv...@gmail.com]

Hello Priyasloka

How is the ACARS reception in BLR? And can you share which RTLSDR dongle you are using? is there a good place where I can buy these in BLR?

 

Thank you.

[Anurag aggarwal]

Uttam,

Which Antenna did gave you 250 kms range ?

[jdow]

It's a dirty job but somebody has to do it.

The antenna which gave him the 250 kms range is the one at 30,000' on the
airplane. Then all you have is line of sight path loss which is modest.

At 1 GHz path loss is about 92.45 + 20 log10(d) with d in meters or about
52 dB + 92.5 dB = 146 dB. So a 1 watt transmitter at that distance is
about at the receiver noise level in a bandwidth of about 500 kHz. It is
easy to demodulate at 50 kHz bandwidth. If the transmitter power is more
than 1 watt the demodulation becomes more error free.

So a bog standard resonant whip with a decent ground plane is sufficient
for most uses. Fancier antennas do exist, though.

{^_^} Joanne/W6MKU taking her smart ass hat back off.