Архив за 15.05.2019

Finally got around to testing my XTRX and can’t complain about 75 MHz of RF Bandwidth

Finally got around to testing my XTRX and can't complain about 75 MHz of RF Bandwidth submitted by /u/SDR_Lumberjack
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KerberosSDR • Re: Clock oscillator on KerberosSDR?

Synchronizing clocks for SDRs is a well established technology, first used to sync data streams for Radio and RADAR Astronomy in the late 1970s. To forgo the boring details of how this is done with SDRs, I will say that it is a technique using a sudo-phased-locked-loop. The SDR's clock frequency varies according to the one second heartbeat of the GPS System. A ring counter, typically 10 MHz or higher, is set up or down depending on where the beginning of the ring count falls compared to the GPS Heartbeat. If the Ring count is too high then the number of ticks in the ring are added slowing the clock; too low, ticks are subtracted, speeding the clock. Plus there are environmental restrictions like Oven stabilization of the clock circuits, etc. It may not be practical to try this with an existing design, the Clock must be generated externally unless the radios are initially designed with this feature. It does not end there; the individual data packets must contain the Time-code and location code for each sample with high enough resolution to coordinate packets from multiple receiver/antenna locations perhaps separated by thousands of miles typical of RADIO Astronomy observations. For Passive RADAR, this task is daunting and becomes statistical nightmare requiring each physical site to be highly tweaked, with petabytes per day of data possibly generated.
http://radar.salsburg.com/
https://www.orolia.com/resources/knowle ... ronization

Statistics: Posted by jsalsburg — Wed May 15, 2019 11:06 pm


RTL-SDR Discussion • Re: Graves Meteor detection

Using the GRAVES Space RADAR for Meteor detection, you need to point your antenna above the horizon. Computing the angle is the chore you face; more than 2 degrees and less than 30 degrees is ideal, depending on you relative location to the Transmission. Subscribe to radiometeoren <ls.vvs.beforum> for help, these guys have been doing what you want to do for decades. You also face detecting very low level signals, which requires a large multi-element yagi with a LNA fixed to the feed element, the more elements the better.
http://radar.salsburg.com/

Statistics: Posted by jsalsburg — Wed May 15, 2019 10:39 pm


Comment on RTLion: The Multipurpose RTL-SDR Framework by sir richard

hackrf support would be great 🙂

nice work!

Troubleshooting Help • Re: No devices in SDR

Have just gone through a similar issue, 64bit windows 10, the 64bit driver simply doesn't work, I re-ran zadig after copying the 32bit driver into SDR Sharps directory and re-installed the driver, then it would show up in SDR Sharp :)

Statistics: Posted by jeremyb — Wed May 15, 2019 8:38 pm


RTL-SDR Discussion • Re: Help withRTL-SDR & SDR# No Device Selected error

Have just gone through a similar issue, 64bit windows 10, the 64bit driver simply doesn't work, I re-ran zadig after copying the 32bit driver into SDR Sharps directory and re-installed the driver, then it would show up in SDR Sharp :)

Statistics: Posted by jeremyb — Wed May 15, 2019 8:36 pm


Software Defined Radio — как это работает? Часть 1…

Software Defined Radio — как это работает? Часть 1
Software Defined Radio — как это работает? Часть 1

Troubleshooting Help • Re: No Device Selected Tried Everything Listed Everywhere to Solve

Have just gone through a similar issue, 64bit windows 10, the 64bit driver simply doesn't work, I re-ran zadig after copying the 32bit driver into SDR Sharps directory and re-installed the driver, then it would show up in SDR Sharp :)

Statistics: Posted by jeremyb — Wed May 15, 2019 8:33 pm


RTL-SDR Discussion • Re: Dongle Case Temp. When Running ?

It's fine. The case acts like a heat sink to keep the dongle working at it's optimum operating temperature and it should be warm. I run mine 24/7 for ADS-B and I have no issues.

Statistics: Posted by bmh — Wed May 15, 2019 7:58 pm


KerberosSDR • Re: Power connection question

It would really be helpful if you could state whether or not the pulldown resistors on VCONN are present and what values they have. Again, this has nothing at all to do with whether or not the PSU can do PD, but the fact you're using a USB-C receptable. The pulldown resistors are required to figure out that the port is a power sink and how much power it is going to use. There is no "legacy USB2.0 mode" on these ports, but a cable that connects to a USB-A plug would require pullup resistors on the USB-A side in order to power the pulldown resistors on the USB-C side correctly. These are the 56k resistors that are often mentioned for charger cables. With such a cable you could also target USB-BC (battery charger), but that's resistors in other places and only good for 1.5A officially.

Statistics: Posted by Stromeko — Wed May 15, 2019 6:55 pm


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