Search found 47 matches

by Aussie Susan
Fri Jun 05, 2020 2:53 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 946

Re: Bias T

i can always open it and check what is inside, .... it will be much easier if i know what to look for Check out https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/ for how it looks inside. I'm not sure if a schematic is published and the reply in https://www.rtl-sdr.com/forum/viewtopic.php?t=2197 sa...
by Aussie Susan
Wed Jun 03, 2020 3:54 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 946

Re: Bias T

Check to make sure that you have a REAL RTL-SDR. I bought one that was a cheap knock-off and it was completely missing the Bias-t hardware - the chip responded correctly (as did yours) but there was no hardware to provide the voltage. May not be the issue - you seem to be getting some voltage wherea...
by Aussie Susan
Mon Jun 01, 2020 3:01 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 946

Re: Bias T

(From Memory) Use the rtl_eeprom software and there is a setting in that to turn on bias-t permanently.
Susan
by Aussie Susan
Fri May 29, 2020 2:32 am
Forum: RTL-SDR Discussion
Topic: automatic start
Replies: 2
Views: 349

Re: automatic start

Which OS?
On Windows you can put shortcuts int the "Startup" folder.
On a number of Linux systems you can add something to systemctl (or equivalents)
Susan
by Aussie Susan
Thu Apr 09, 2020 11:45 pm
Forum: Troubleshooting Help
Topic: RPi 4, Buster, new V3 SDR but no voltage
Replies: 2
Views: 714

Re: RPi 4, Buster, new V3 SDR but no voltage

The problem turns out to be me - indirectly. I did finally find a picture of the V3 dongle and so opened up my one to find where to check the bias T voltages - my board was totally different. I fell into the trap of buying a fake dongle. Now to find a real one (and not the one on Amazon that is adve...
by Aussie Susan
Thu Apr 09, 2020 8:45 am
Forum: Troubleshooting Help
Topic: RPi 4, Buster, new V3 SDR but no voltage
Replies: 2
Views: 714

RPi 4, Buster, new V3 SDR but no voltage

The configuration is in the subject line. The V3 dongle is brand new as is the Wideband LNA. (I bought it from a place that is supposed to be reputable so I don't think it is a cheap knock-off.) I have installed the software to run the dongle and it seems to work OK - rtl_test shows no errors and rt...
by Aussie Susan
Thu Feb 27, 2020 2:07 am
Forum: RTL-SDR Discussion
Topic: noaa 19 direct sounder broadcast?
Replies: 4
Views: 4551

Re: noaa 19 direct sounder broadcast?

Where did you get the information from? Looking at http://mdkenny.customer.netspace.net.au/metsat_frequencies.html#noaa, the only mention of BPSK is on the 'Command' section and in the 2GHz range. There is a 137.77MHz mentioned in the TIP section that talks about '8320 BPS bi-phase-level/PM - TIP is...
by Aussie Susan
Wed Feb 26, 2020 2:28 am
Forum: RTL-SDR Discussion
Topic: noaa 19 direct sounder broadcast?
Replies: 4
Views: 4551

Re: noaa 19 direct sounder broadcast?

The NOAA satellites (and others) that work in the 137MHz range use APT (Automatic Picture Transmission). I think you will find that the modulation is a bit more complex the BPSK (binary phase shift keying) but the first step to decoding is to use an FM receiver. That will produce an audible signal (...
by Aussie Susan
Wed Feb 12, 2020 1:28 am
Forum: RTL-SDR Discussion
Topic: usb_claim_interface error -6
Replies: 4
Views: 2434

Re: usb_claim_interface error -6

Glad to hear it. The things that you seemed to be misunderstanding was the word 'driver'. This is a part of the Linux kernel and,unless you blacklist it, it will grab the RTL-SDR interface and expect that all of the user software will use it to talk to the device. This works in exactly the same way ...
by Aussie Susan
Tue Feb 11, 2020 2:33 am
Forum: RTL-SDR Discussion
Topic: usb_claim_interface error -6
Replies: 4
Views: 2434

Re: usb_claim_interface error -6

Did you blacklist the RTL-SDR to stop the default kernel driver from grabbing the interface (the first thing the error message mentioned)?
I also got this message when I accidentally tried to run two of the RTL-SDR apps at the same time.
Susan