Архив за 01.05.2019

KerberosSDR • Re: Android App connection error

mdacosta wrote:
Wed May 01, 2019 2:21 pm
Working now!

To recap,

On the phone, Mobile (Cellular) Data needs to be OFF
GPS position: Even if Google Maps shows a position inside a building, the phone needs a clear view of the sky. I guess Google uses Wi-fi/Cell/GPS to give a position and the Kerberos App only uses the GPS.
DOA error: The DOA Enable features needs to be ON :oops:
Glad to hear you got it going!

I think on some Android devices there is a setting that says if there is no internet detected on the WiFi connection, automatically disconnect the WiFi and switch to mobile data. That would screw up the connection.

The Kerberos app does indeed only use GPS for location. The other two are only for approximate locating when GPS isn't available, and you can't get a heading with those.

Statistics: Posted by rtlsdrblog — Wed May 01, 2019 11:59 pm

Best spot for mounting a antenna

I just recently got the rtl-sdr kit that comes with a v dipole antenna. I currently have it on the side of my house with the suction mount it comes with, but I don't get a very good signal when receiving my NOAA. Do you think it would be better for me to put it in my attic because I am in able to mount it to my roof? Also do you think putting something like a QHF antenna in my attic would be a good idea? Thank you.

submitted by /u/marcocet
[link] [comments]

Troubleshooting Help • Kernel driver vs. Osmocom userspace driver?

I’m a little confused about the driver situation on linux. It seems like the most used driver is the osmocom librtlsdr userspace driver, but there is also a native kernel module driver that creates a /dev/swradio device. http://blog.palosaari.fi/2014/02/linux- ... e.html?m=1

If I have a kernel with the native driver module, should I even need to install librtlsdr?

Many of the guides I’ve seen actually recommended blacklisting rtl2832_sdr.ko which seems really backwards to me. Is it like most applications don’t support the kernel driver or something?

Statistics: Posted by dashawn — Wed May 01, 2019 8:32 pm

Troubleshooting Help • Noolec sdr with HDSDR .. Help !!

Hi would appreciate any assistance on the following..have the Noolec sdr dongle and just downloaded HDSDR , there is no sound coming from the software when running so guessing I am missing a file or whatever that has to be added ?
Already have sdr#running fine on my windows 10 pc with this same dongle so thought it might have just been a case off downloading and installing the new HDSDR software.

Any ideas what I am doing wrong ?

Statistics: Posted by jono400 — Wed May 01, 2019 7:10 pm

KerberosSDR • 4x dump1090 on KerberosSDR

Finally received my kerberosSDR yesterday. :D

I don't have the USB-C PSU yet, but running four dump1090 instances just works when connected to a USB3.1 port directly on the PC motherboard (on the frontpanel connector I get it to run, but the devices frequently drop and then reconnect when running the fourth instance). The configuration currently is:
  • * PCB antenna
    * ADSB filtered preamp 38dB
    * passive power splitter (1:2 into two 1:2)
This is already great for determining the best gain value to use, even if I'm not using the coherency. Later on I hope to figure out how to determine the sample offsets (or sync the receivers) so I can merge the four data streams without breaking MLAT.

Statistics: Posted by Stromeko — Wed May 01, 2019 6:57 pm

KerberosSDR • Re: GPIO connection

Can the pinout of the header be documented somewhere, please?

Statistics: Posted by Stromeko — Wed May 01, 2019 6:50 pm

Where to point my V-dipole?


I seem to have a problem with my 137MHz V-dipole antenna. As you can see in the picture, the gain at mid-elevation is very good, but as the satellite gets higher, for some reason the signal gets weaker, to the point where I had to manually adjust the antenna because it almost disappeared. You can see several slices of picture in the middle - that is during highest elevation of the satellite, and I am pretty sure that if I have not fiddled with the antenna there would be a blank white space. Then, as the satellite sets, I got the signal back, but I had to angle the V-dipole towards the horizon.

So, my question is, how should I set up the V in order to get good gain at high elevations? I had it just like this post says:https://www.rtl-sdr.com/simple-noaameteor-weather-satellite-antenna-137-mhz-v-dipole/

Parallel with the horizon, but I had the "open" side of the V pointed at north instead of south (S < N), because the satellite was coming from the north.

Or, my alternate question; how can I increase the directionality of the V-dipole, so that I can just track the satellite and not worry about a fixed position? Perhaps a V-yagi configuration - https://www.antennas27.com/v-yagi-antenna-27-mhz-11-m

I already experimented with a double-cross and a cross-yagi/turnstile, but the gain seemed to be much lower than what the simple V can provide (https://photos.app.goo.gl/dHBv6UeUJyuYpjV2A - image received on a five element cross-yagi, it is about 1/4 of the size of the one from the V-dipole)

submitted by /u/derekcz
[link] [comments]

Comment on ARRL QST Review of the SDRplay RSP2Pro with Independent Lab Measurements by louis aubree

The review of the RSP2Pro in QST makes reference to a Lab Notes sidebar that was never released. (with the * at the end of the measurement table)

Troubleshooting Help • Re: About heat

Different brands of RTL-SDR dongles seem to require different amounts of power. Some dissipate significantly more heat than others. In my experience, the E4000 dongles run cooler, and one of my smaller NooElec dongles got so hot, it burned itself out.

Statistics: Posted by hotpaw2 — Wed May 01, 2019 3:17 pm

RTL-SDR Discussion • Re: RTLSDR2832U IF bandwidth

The 3.2 MHz bandwidth maximum seems to be a limitation of the RTL2832's back-end digital logic, not the front-end analog bandwidth or anything to do with the R820T.

Statistics: Posted by hotpaw2 — Wed May 01, 2019 3:13 pm

Май 2019
Пн Вт Ср Чт Пт Сб Вс
« Апр   Июн »