rtl-sdr.com

Unless you use direct sampling, yes.

In short: There is no antenna that provides you good reception, especially at HF with this dimensions, because you can't beat physics! You can receive with everything, starting from a wet noodel cooked in salt water, a 1 ft nail for VHF and a few meter of wire for HF. If it conducts it will receive....

Depends on the type of feed line. If you have a symetrical feed line like a chicken wire (two parallel wires spearated by some form of plastic), you don't a Balaun at the antenna but at the end when you convert to a coax system, this is why early TV had the Balaun inside the TV-receiver at the symet...

No one can answer your question if you do not provide the bare minimum of information e.g. specify your "small antenna" in relation to the frequency range you want to receive, is it (omni-) directional, where did you place it indoor, which floor, are the walls steel reinforced or outdoor, on ground ...

Tuning an R820T2 RTL-SDR up to 6 GHz via a Harmonic Mixing Driver Hack provides information about an softwarehack that allows to to use the 5th harmonic on R820T2 RTL-SDRs to receive frequencies above the normal 1.766 GHz limit https://www.rtl-sdr.com/tuning-an-r820t2-rtl-sdr-up-to-6-ghz-via-a-harmo...

Have you looked at "antenna related information and guidance for asking questions to improve chances for an answer"? In addition coaxcable- Balauns and Ferrite-Baluns there are other versions to achive balanced to unbalanced feedin, just check amateur radio websites for building a 10 m dipole and in...

If you look through the links provided at the page from DG8SAQ "VNWA3" I found a Automatic SMA Calibrator for DG8SAQ VNWA 3 Series onn the https://www.sdr-kits.net page I found an Automatic SMA Calibrator for DG8SAQ VNWA 3 Series https://www.sdr-kits.net/Magi-Cal-Automated_SMA_Calibrator_for_VNWA. A...

Here is a collection of links or webpages providing links The concept used for the NanoVNO DG8SAQ VNWA2.x / VNWA3 Information with lots of links and relevant information http://www.dg8saq.darc.de/VNWA21/index.html NanoVNA versions NanoVNA https://nanorfe.com/nanovna-versions.html#versions BH5HNU's 3...

I want to order NanoVNA and would like to know what are the hardware differences between the original designs and clones. Does anyone know of a site that compared the differences between the original and the clone designs similar to the different RTL-SDR designs and clones? From what I read all desi...

Maybee you could change the topic to something like "137 MHz NOAA preamp" to make this thread easier to find I just checked, there are a number of 137 MHz preamps with bandpath filter available, e.g. https://www.wraase.de/de/shop/#aa-137 http://www.hf-berg.de/HFC/vorverstaerker_weissblech.htm look f...