Search found 51 matches

by Aussie Susan
Mon Jun 19, 2017 2:59 am
Forum: Off-Topic
Topic: Radio Astronomy forum
Replies: 2
Views: 11640

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: 5702

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: 6289

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: 6289

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: 16341

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: 5071

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 ...
by Aussie Susan
Fri Jan 20, 2017 4:06 am
Forum: Off-Topic
Topic: SPI communication between two components
Replies: 2
Views: 6575

Re: SPI communication between two components

Looks to me as though you have avoided most of the common traps in getting the PIC24F family SPI peripherals going (CKP and CKE are correct, and although it is difficult to tell from the slave's data sheet, I think the SMP of 0 is also correct in this case). However please delete the lines that set ...
by Aussie Susan
Thu Sep 22, 2016 3:57 am
Forum: Troubleshooting Help
Topic: Can not open device
Replies: 3
Views: 10936

Re: Can not open device

Don't forget that all Windows really looks at is whether or not the device responses to the basic USB identification handshakes. It does not look at the internal operation of the device itself. Therefore all you can really take from Windows telling you the 'device is working properly' is that it can...
by Aussie Susan
Thu Aug 25, 2016 4:26 am
Forum: Antennas
Topic: need recommandation for better signal
Replies: 10
Views: 17344

Re: need recommandation for better signal

Antenna are funny beasts to get right and what you are asking for might be a little tricky (if I've understood your question correctly). The most effective antenna are generally about 1/4 of the wavelength you are trying to receive. Aircraft conversations are all in AM and are from 108MHz to 137MHz....
by Aussie Susan
Wed Aug 24, 2016 3:09 am
Forum: Antennas
Topic: wideband antenna for satellite reception
Replies: 4
Views: 9360

Re: wideband antenna for satellite reception

Have a look at what the Radio Amateurs use to talk with the satellites. They often use a mixture of 2m and 70cm antenna on a steerable (or hand-held) mount. 137MHz is close to the 2m frequency range so suitable adjustments to the antenna can be made there. You can probably also replace the 70cm ante...