KerberosSDR & Aircraft Beacon Search

Discuss KerberosSDR - 4x Coherent RTL-SDR
rtlsdrblog
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Re: KerberosSDR & Aircraft Beacon Search

Post by rtlsdrblog » Tue May 21, 2019 11:37 am

Yes that's right. Considering a car is typically at least 1.7m in width, if should fit easily.

Batch 2 of KerberosSDR is currently available for preorder at http://indiegogo.com/projects/kerbeross ... t-rtl-sdr/. Because it's in preorder it's already discounted, unfortunately we can't discount any further right now.

Maginux
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Re: KerberosSDR & Aircraft Beacon Search

Post by Maginux » Tue May 21, 2019 12:04 pm

I will probably wait a bit the results of "SignalsEverywhere", no doubt he can tell me more with his tests but I admit that this project interests me if it is applicable in the context that interests me !

Maginux
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Re: KerberosSDR & Aircraft Beacon Search

Post by Maginux » Sat Nov 23, 2019 12:58 pm

Hello everyone, I come back to you after falling purely by chance on the new website offering the sale of Kerberos SDR; I would have liked to have news about its evolution since May and if it becomes as functional as I could see it thanks to the videos of "SignalsEverywhere". I am very pleasantly surprised at its price and I look forward to your feedback, because I remain convinced that this device can be useful for me looking for aircraft beacon.

WA4OSH
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Re: KerberosSDR & Aircraft Beacon Search

Post by WA4OSH » Sat Nov 23, 2019 8:17 pm

121.5 MHz ELTs were phased-out 10 years ago in February 2009. The new system is on 406 MHz. Here is an article that describes the differences.
https://www.sarsat.noaa.gov/406vs121.pdf

There's also a system that runs on 243 MHz, which also has been phased-out.
http://www.arrl.org/news/distress-beaco ... phased-out

I suppose there are still some people that are still flying with obsolete technology. Here's some specifics on the signal that's being sent:
https://en.wikipedia.org/wiki/File:Radi ... ,5_MHz.ogg

...and this company thinks that 121.5 MHz ELTs will always be needed:
https://www.polarisrdf.com/2018/12/20/w ... be-needed/

Perhaps you are actually interested in building an ELT tracker for 406 MHz? Sometimes a satellite or aircraft can't locate the 406 MHz beacon for a variety of reasons. This is where a vehicle or back-pack carried receiver may come in handy.
https://www.gocivilairpatrol.com/media/ ... 65921D.pdf

--Konrad, WA4OSH

WA4OSH
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Re: KerberosSDR & Aircraft Beacon Search

Post by WA4OSH » Sat Nov 23, 2019 8:33 pm

Maginux,
If you were interested in using KerberosSDR to "fox hunt' a low-powered transmitter to simulate locating a 5 watt burst-mode 406 MHz ELT transmitter, you could experiment with fox-hunting a low-powered (10mW) 433 MHz transmitter in can be operated in many regions in the world license free. However, in the US, you will have to have an Amateur Radio license. https://en.wikipedia.org/wiki/LPD433

--Konrad, WA4OSH

WA4OSH
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Re: KerberosSDR & Aircraft Beacon Search

Post by WA4OSH » Sat Nov 23, 2019 8:42 pm

Maginux,
Another low-powered transmitter to "Fox Hunt" for is a garage door opener. These typically run in the 310-390 MHz band.

--Konrad, WA4OSH

Maginux
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Joined: Sun Apr 21, 2019 9:27 am

Re: KerberosSDR & Aircraft Beacon Search

Post by Maginux » Sun Nov 24, 2019 9:23 am

WA4OSH wrote:
Sat Nov 23, 2019 8:17 pm
--Konrad, WA4OSH
I greatly appreciate your courses on the thing that interests me, but it seems to me to have specified that I work in a branch of the French civil security that deals with looking for the tags of damaged aircraft; so unfortunately everything you just wrote to me is not new to me, but I appreciate your attention !
To return to 121.5, some planes by my home use this system and it is on this frequency that the team with which I work carries out its exercises (121.5 & 121.375 Mhz).
Given the KerberosSDR frequency band, I think it can work just as well with a 121.5 or 406 MHz beacon; it was mostly for this use that I asked for returns of use.
And to conclude on the subject of the amateur radio license, it does not seem to me really necessary for me because for a simple listening; a bi-band is enough. :geek:

WA4OSH
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Joined: Thu Nov 07, 2019 5:07 pm

Re: KerberosSDR & Aircraft Beacon Search

Post by WA4OSH » Fri Nov 29, 2019 10:12 pm

Yes, you can do that on a car's rooftop,

KerberosSDR is on sale!
https://othernet.is/products/kerberossd ... nt-rtl-sdr

--Konrad, WA4OSH

Maginux
Posts: 17
Joined: Sun Apr 21, 2019 9:27 am

Re: KerberosSDR & Aircraft Beacon Search

Post by Maginux » Thu Dec 26, 2019 7:12 pm

WA4OSH wrote:
Fri Nov 29, 2019 10:12 pm
Yes, you can do that on a car's rooftop,
I was able to order it before Christmas and I think it should not be long before it is delivered to me. Only, I am still perplexed concerning the spacing dimensions of the antennas; if I use the SignalsEverywhere calculator (here) and filling in the data as follows, I arrive at these results:
Frequency: 121.5
Spacing Factor: 0.33

Spacing: 32.057 inches
Factor:0.233
Frequency: 121.375
Spacing Factor: 0.33

Spacing: 32.090 inches
Factor:0.233
Which therefore makes me rather perplexed, because it does not really seem to correspond to the diagram, which I have previously validated concerning the spacing (here); so be it, I didn't understand or I missed an information. In any case, I wait to understand before I start buying antennas (here) or make them myself.
If not to reduce the spacing drastically, I could work on a harmonic 3 (364.5 Mhz / 364.125 Mhz) or 4 (486 Mhz / 485.5 Mhz) but I am afraid of having to use an amplifier at each antenna to be certain to receive the signal from the beacon; would this be a good idea ?

PERILLOS
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Re: KerberosSDR & Aircraft Beacon Search

Post by PERILLOS » Tue Dec 31, 2019 10:16 am

Bonjour

Pour le 121.500 ou 121.375 je pense un écartement d'antenne de 50 cm doit fonctionner.
246.74276378600823 x 0.20 =49.3485527572.

J'ai fait des essais sur le 145 Mhz et ça fonctionne très bien avec aussi un écartement de 50 cm entre antennes.

Prochainement je ferais des essais sur 121.375 avec une balise d'exercice .
Si tu veux je te donnerais les résultats .
On se sert des harmoniques uniquement quand on est proche de la balise moins de 100m.
A oublier avec le Kerberos.

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