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 Post subject: Wireless/WIFI For Antenna Connection?
PostPosted: Wed Jun 14, 2017 4:20 pm 
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smark220 - FlightAware user avatar

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Is it possible to use a wireless access point to connect an antenna to a Raspberry PI 3?

I want to install the antenna in my attic, but don't want to run coax.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Wed Jun 14, 2017 6:08 pm 
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obj - FlightAware user avatar

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You need physical coax between the dongle and the antenna, and physical USB cabling from the dongle to the Pi.

You could put the Pi in the attic (cabled to the antenna) and have it connect over wifi rather than running ethernet cable.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Thu Jun 15, 2017 12:21 pm 
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smark220 - FlightAware user avatar

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obj wrote:
You need physical coax between the dongle and the antenna, and physical USB cabling from the dongle to the Pi.

You could put the Pi in the attic (cabled to the antenna) and have it connect over wifi rather than running ethernet cable.

obj,

Thank you for your reply.

I previously considered your suggestion, but I was concerned about the great heat in the attic during summer months affecting the Pi. I have the "turbine" attic ventilators and vents, but it still gets very hot up there.

Thoughts?


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Thu Jun 15, 2017 3:51 pm 
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biekerc - FlightAware user avatar

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A RPi can get pretty hot even in normal conditions, at least thats my experience.

A heatsink might help, and an enclosure with fan might also be necessary. Some people here build boxes with a bigger fan that cools Pi and the (stripped) dongle. Or you could try and reduce the clockspeed. I use a Pi B+ without problems, seeing around 2800 a/c per day, so a RPi3 should not be to busy.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Sat Jun 17, 2017 12:14 am 
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myalias - FlightAware user avatar

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If you use a WiFi dongle, keep it well away from the SDR dongle. The WiFi transmissions will overwhelm the SDR and cause you to lose messages.

The Raspberry Pi is fine with temperatures up to 80° (176°F). I would try mounting it without a case so that air may passively flow over the CPU.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Sun Jun 18, 2017 10:02 am 
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smark220 - FlightAware user avatar

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myalias wrote:
If you use a WiFi dongle, keep it well away from the SDR dongle. The WiFi transmissions will overwhelm the SDR and cause you to lose messages.


Thank you for your reply, but I'm not clear on that. Doesn't the Raspberry Pi 3 have on-board wifi/bluetooth? If so, is using that an issue as you described?


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Sun Jun 18, 2017 2:18 pm 
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abcd567 - FlightAware user avatar

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If you want to transfer signal from antenna to DVB-T wirelessly, you will need a pair gadget to do this, one gadget attached to antenna in attic, other to input of DVB-T somewhere in the room.

The gadget at antenna will be essentially a frequency shifter+transmitter, and gadget at DVB-T will be essentially a small antenna (possibly with rf amplifier), to receive signal from transmitter gadget at antenna.

Now question is "For 1090 mhz, is such a gadget available commercially at reasonable price?"

Even if such a gadget is available, you will still have to run a cable to antenna in attic to feed power to this gadget, and the gadget will fry in heat of the attic.

So why not go for a very simple and easy solution: Run a coax from antenna in attic to DVB-T+Pi combo located down below in the room.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Sun Jun 18, 2017 9:40 pm 
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smark220 - FlightAware user avatar

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abcd567 wrote:
So why not go for a very simple and easy solution: Run a coax from antenna in attic to DVB-T+Pi combo located down below in the room.


That's not the solution, that's the problem (that I'm trying to avoid). :)


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Mon Jun 19, 2017 8:27 am 
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abcd567 - FlightAware user avatar

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smark220 wrote:
abcd567 wrote:
So why not go for a very simple and easy solution: Run a coax from antenna in attic to DVB-T+Pi combo located down below in the room.


That's not the solution, that's the problem (that I'm trying to avoid). :)

Is it COAX you want to avoid, or do you want to avoid EVERY CABLE (Coax, USB extension chord, Network Cable, Power Supply cable etc)?

If it is EVERY CABLE to be avoided, I dont think you can find a solution.


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Sun Jun 25, 2017 3:37 pm 
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biekerc - FlightAware user avatar

Joined: Sat Jul 16, 2016 2:17 am
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biekerc wrote:
A RPi can get pretty hot even in normal conditions, at least thats my experience.

A heatsink might help, and an enclosure with fan might also be necessary. Some people here build boxes with a bigger fan that cools Pi and the (stripped) dongle. Or you could try and reduce the clockspeed. I use a Pi B+ without problems, seeing around 2800 a/c per day, so a RPi3 should not be to busy.


In this thread is an example for such a setup.

http://discussions.flightaware.com/ads-b-flight-tracking-f21/announcing-the-pro-stick-plus-t38099-200.html


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 Post subject: Re: Wireless/WIFI For Antenna Connection?
PostPosted: Fri Jul 07, 2017 3:40 am 
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Devonian - FlightAware user avatar

Joined: Wed Dec 23, 2015 2:54 pm
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Although not wireless, I had the idea of using a USB to ethernet device.
That is, the dongle plugged into the device and accessed over ethernet.
If it were possible, it would put the dongle right where it is best, at or very close to the antenna = nearly no cable/signal loss.
In theory, you could now have the dongle up to 100 yards/metres from your network switch/router and no signal loss.
Imagine having an antenna/dongle at some remote site with enviable reception (and internet connectivity) and you access it from afar.

I tried with a TP-Link TL-PS310U
https://www.amazon.co.uk/TP-LINK-TL-PS3 ... B002LB8XFK
http://www.tp-link.com/us/download/TL-PS310U.html

Using Windows 7, I can get an RTL-SDR dongle to be presented to the system, unfortunately, even using Zadig to add the correct driver, SDR# RTL1090 etc cannot access it even though Windows device manager 'sees' it as the correct USB device.

I haven't tried with Linux and a GUI, let alone command line only but on the TP-Link site, it shows how to access the device and add a printer attached to the TL-PS310U.
http://www.tp-link.com/us/faq-352.html

I see on the TP-Link website, they may offer source code for the TL-PS310U, but I'm now way out of my league.
An email to GPL@tp-link.com might yield something useful if anyone is brave enough to take it on ;-)

Nigel.


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