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Comment on New Store Products: SDRplay RSP1A Metal Case Upgrade + Portable Antenna Set by admin

It matters a little, more so if you’re using a long lossy coax run. Use this calculator to see the effect http://kv5r.com/ham-radio/coax-loss-calculator/.

Basically, the more coax line loss you have the more significant the loss due to SWR mismatch becomes.

So if you connect our wire spool directly to the SDR (resulting in minimal coax line loss), the loss due to mismatch is mostly less than ~3dB. But if you start adding in lossy coax, the loss due to mismatch increases. In that case you’d want to add an impedance transformer.

Comment on Detecting The Sound of Bats with a Piezo Speaker and SDRplay RSP1A by Jan de Jong

according to the specifications sheet following:
Maximum Input Power +0dBm Continuous
+10dBm Short Duration

http://wera.cen.uni-hamburg.de/DBM.shtml
0dBM 0.100E-02 223.607 mV 316.180 mV 632.360 mV

so now there is something to measure. I hope to see more persons experimenting with this btw.
Another analog input is an LDR or LED to record the “sounds” that are there in sunlight ore moonlight.

Comment on GammaRF: Distributed Radio Signal Collection and Analysis with RTL-SDR and HackRF by zipfly30

If these devices had GPS input and a known training signal (local FM station or GSM channel for calibration) on that same computer, you could really sync-up those inquiries giving you excellent resolution on analyzing/geo-locating signals, even using just an RTL-SDR. Imagine also throwing in a line of bearing (LOB) by using a KerberosSDR here or there. Now that would be some fidelity.

Comment on Listening to the Sound of Molecules via Nuclear Magnetic Resonance and an RTL-SDR by Joe Q.

Neat demo — more showing what the SDR can do (i.e., duplicate some of the circuitry inside the NMR console) rather than the NMR effect per-se. As a chemist, though, it floats my boat 🙂

Comment on NooElec SAWBird: An LNA + Filter for GOES Weather Satellite Reception Now Available by Rob Dale

I don’t see one online but they are quite responsive if you go to their website.

Comment on Detecting The Sound of Bats with a Piezo Speaker and SDRplay RSP1A by Jan de Jong

I did have some thoughts about damaging but curiosity took over. I had to know if it would work. Also since I basically short and there is no amplifier, plus a long cable with at least some resistance, I went ahead.
I did tap the piezo to check if it works at all and that does not seem to damage the SDR. I had to use the RSP1A because the normal RTL usb dongle does not go to the 40-60 KHz range.
I can pickup also cicadas and grashoppers at about 8-10Khz. My inspiration for this goes back to the time where i saw in a biology lab a special tape-recorder that was used for this purpose. It would record with high reel speed the Bat-sound and then be played back on lower speed. With the SDR software i finally had a simple way to do more or less the same, at least visualize this.
I did not have too much time over the summer but have made some more recordings. I will post in the next weeks in my youtube again. (without music as some have requested)

Comment on Submit a Story/Contact by Fernando fernández de Villegas (EB3EMD)

In the SDRSharp installation procedure, in the page “Manual Installation of SDR# – Manual Installation of the RTL-SDR drivers with SDR# for the RTL-SDR” (https://www.rtl-sdr.com/manual-installation-of-sdr/) (i.e. for PC without Internet connection) it is indicated that the version of the ‘rtlsdr.dll’ driver that has been copied to the SDRSharp program folder must be 32 or 64 bits, depending on the operating system installed on the computer. It say: “Download the RTL-SDR Drivers, and extract the rtlsdr.dll file from the x32 folder (or x64 folder if you have a 64-bit OS) into the SDR# folder.”

I think it is not correct, the rtlsdr.dll version is 32 bits (SDRSharp is a 32 bit software). My system uses 64-bit Windos 7 SP1, and SDRSharp could only recognize the RTL-SDR dongle when I replaced the 64-bit rtlsdr.dll driver with its 32-bit version.

Please check this and correct that error in this document for the good of all.

Comment on Quick Start Guide by Fernando fernández de Villegas (EB3EMD)

In the SDRSharp installation procedure, in the page “Manual Installation of SDR# – Manual Installation of the RTL-SDR drivers with SDR# for the RTL-SDR” (https://www.rtl-sdr.com/manual-installation-of-sdr/) (i.e. for PC without Internet connection) it is indicated that the version of the ‘rtlsdr.dll’ driver that has been copied to the SDRSharp program folder must be 32 or 64 bits, depending on the operating system installed on the computer. It say: “Download the RTL-SDR Drivers, and extract the rtlsdr.dll file from the x32 folder (or x64 folder if you have a 64-bit OS) into the SDR# folder.”

I think it is not correct, the rtlsdr.dll version is 32 bits (SDRSharp is a 32 bit software). My system uses 64-bit Windos 7 SP1, and SDRSharp could only recognize the RTL-SDR dongle when I replaced the 64-bit rtlsdr.dll driver with its 32-bit version.

Please check this and correct that error in this document for the good of all.

Comment on Quick Start Guide by admin

If it doesn’t see the dongle at all it’s most likely dead. Contact the seller or manufacturer of the dongle you bought for a replacement.

Comment on KerberosSDR Preview: A 4x Coherent RTL-SDR for Direction Finding, Passive Radar and more by admin

It’s possible that you could indeed set up multiple fixed position KerberosSDRs and have them each provide bearings for automatic pinpointing.

BTW, the KiwiSDR doesn’t use signal strength, it uses TDoA (time difference of arrival) which is different.

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