Search found 51 matches

by Aussie Susan
Sat Jan 02, 2021 2:36 am
Forum: Antennas
Topic: Antenna for raspberry pi
Replies: 1
Views: 3327

Re: Antenna for raspberry pi

How are you using the RPi to generate the 433MHz signal? As for the antenna, in general the lead between the Tx device and the antenna can be just about anything and any length (up to a point) AS LONG AS it has the right impedance. For example, if you are using a Tx device that expects a 50Ohm load ...
by Aussie Susan
Wed Dec 02, 2020 2:01 am
Forum: Troubleshooting Help
Topic: High pitch noise from the Raspberry
Replies: 2
Views: 1002

Re: High pitch noise from the Raspberry

Wild guess - you are drawing to much power and the PSU (and components on the RPi board) are complaining.
Susan
by Aussie Susan
Tue Aug 18, 2020 6:06 am
Forum: Troubleshooting Help
Topic: want to broadcast radio [!help]
Replies: 4
Views: 1898

Re: want to broadcast radio [!help]

The RTL-SDR is a receive only device. I would warn you that transmitting signals requires a license (except in a very few range of frequencies such as are used for remote control of garage doors and the like - and even there it normally requires commercially made devices) in almost every country I k...
by Aussie Susan
Mon Jul 20, 2020 9:46 am
Forum: RTL-SDR Discussion
Topic: GPS to Glonass transition with RTL SDR
Replies: 10
Views: 4738

Re: GPS to Glonass transition with RTL SDR

Nothing to do with the frequency being too high - everything to do with the bandwidth being way too wide for the RTL-SDR. Check of one of the many sites that come up with a Google search - I looked at: https://www.everythingrf.com/community/gps-frequency-bands which shows this quite well. Iy can rec...
by Aussie Susan
Fri Jun 05, 2020 2:53 am
Forum: RTL-SDR Discussion
Topic: Bias T
Replies: 9
Views: 4082

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: 4082

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: 4082

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: 1622

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: 1802

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: 1802

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...