Search found 35 matches

by Aussie Susan
Mon Jan 22, 2018 1:48 am
Forum: Off-Topic
Topic: NSA Tracking of powered down cellphones and other wireless devices
Replies: 7
Views: 20583

Re: NSA Tracking of powered down cellphones and other wireless devices

Also check out how RFID systems work where the device is "powered" by the reader. Also there are a number of new devices coming on to the market with 'wireless charging'. I know this is not what you are talking about as both of those examples have the 'other end' device designed to respond to the re...
by Aussie Susan
Wed Jan 10, 2018 1:46 am
Forum: Antennas
Topic: HF-Antenna made from wire -Ideas?
Replies: 4
Views: 3902

Re: HF-Antenna made from wire -Ideas?

Amateur radio operators have that problem all the time (especially those that live in apartments or have various restrictions on what they can erect) with the added 'bonus' or wanting to transmit as well. Try a Google search for 'stealth hf antenna' or 'limited space antenna' and you might get some ...
by Aussie Susan
Thu Dec 28, 2017 2:39 am
Forum: User Projects
Topic: Demodulate FSK
Replies: 6
Views: 17803

Re: Demodulate FSK

(A bit off topic i know but...) Is there a similar reference for mPSK (especially QPSK) as is used for LRPT? I've been looking for such a thing for a while as I've successfully FM demodulated the NOAA POESs and I'd like to try to METEOR M2 satellite signal as well. Thanks for the above reference - i...
by Aussie Susan
Fri Dec 15, 2017 1:10 am
Forum: RTL-SDR Discussion
Topic: NOAA Satellite Reception [HELP]
Replies: 4
Views: 2611

Re: NOAA Satellite Reception [HELP]

They look like some of my images (I'm based in Melbourne so I also have a similar coastline showing up). I have a QFH antenna with an LNA and I can also get some quite decent images as well. I use an SDRPlay RSPII rather than the RTL-SDR but that is possibly not important here. What you are seeing i...
by Aussie Susan
Mon Jun 19, 2017 2:59 am
Forum: Off-Topic
Topic: Radio Astronomy forum
Replies: 2
Views: 9458

Re: Radio Astronomy forum

Astronomy has long used telescopes to look at the sky in visible light. Radio Astronomy looks at the sky using a range of other frequencies "from DC to Daylight". For example, you can listen to Jupiter from 4MHz on upwards. Also you can look at the sky in Microwave frequencies. The Square Kilometre ...
by Aussie Susan
Wed Mar 29, 2017 3:19 am
Forum: RTL-SDR Discussion
Topic: How quickly can the RTL-SDR be tuned?
Replies: 3
Views: 3649

Re: How quickly can the RTL-SDR be tuned?

Have a look at the 'rtl_fm' documentation - it has a '-f' option (IIRC) that lets you scan a range in whatever step size you set.
Susan
by Aussie Susan
Fri Mar 24, 2017 1:54 am
Forum: RTL-SDR Discussion
Topic: Which is better to use? Mac or PC?
Replies: 5
Views: 3773

Re: Which is better to use? Mac or PC?

Do you have a laptop already? If so then just use that. If not then you probably have a whole lot of other things to consider beyond a hardware dongle. If you want portability then that really comes down to the software you want to run. Choose the software that can run on both Windows and Linux (whi...
by Aussie Susan
Thu Mar 23, 2017 2:43 am
Forum: RTL-SDR Discussion
Topic: Which is better to use? Mac or PC?
Replies: 5
Views: 3773

Re: Which is better to use? Mac or PC?

I use both and a Raspberry Pi - all work well but each has its place. Are you looking for something that can run on a box that is always up such as a network accessible dongle (the Rpi is good for that)? Or do you need it to work on conjunction with other programs, i.e. to feed the signal into other...
by Aussie Susan
Tue Feb 07, 2017 2:21 am
Forum: Antennas
Topic: L-Band receive antenna (960 MHz to 1215 MHz)
Replies: 10
Views: 10615

Re: L-Band receive antenna (960 MHz to 1215 MHz)

Excellent advice.
Also consider cables that are labelled LMRnnn. I use LMR400 to connect to my 23cm antenna (for amateur radio purposes) and I've used LMR200 (slightly more lossy but cheaper) in the past.
Susan
by Aussie Susan
Fri Feb 03, 2017 2:30 am
Forum: RTL-SDR Discussion
Topic: Raspberry Pi Os
Replies: 3
Views: 3087

Re: Raspberry Pi Os

I've used GQRX with the RTL dongle on a RPI3 running the latest Rasbian with the Pixel GUI front-end. Make sure that you get the latest version of GQRX as earlier versions had real problems with this combination. I've heard of others using the RPi/Raspbian combination with lower powered hardware as ...