AirSpy can be started as a system service. I use the USB cheap dongles (2 of them, with one having a built-in downconverter). I don’t use any transmitter for this, strictly receive. Btw, there is an AirSpy mailing list as well as an RTL/SDR mailing list among several others. For what I do here, the AirSpy_rx executable is what I use. The one labeled as _info probably generates an info file on the particular device you have plugged in.
The spy flash executable probably is for flashing compatible units. Not sure about the others.
Btw, here are the units I use:
Unit 1: IEIK SDRICE RTL-SDR FM DAB DVB-T USB Stick Set with RTL2832U & R820T Great SDR for SDR# ADS-B Receiver Set Radio Compatible ICE Input_ Electronics
Unit 2: Nooelec NESDR Mini USB RTL-SDR & ADS-B Receiver Set, RTL2832U & R820T Tuner, MCX Input. Low-Cost Software Defined Radio Compatible with Many SDR Software Packages. R820T Tuner & ESD-Safe Antenna Input_ Computers & Accessories
Both come with their own antennas. Unfortunately, both units are no longer available via amazon. There are, however, low cost more modern variants of the above units available.
Now, there is one unit I wouldn’t mind acquiring that can cover ELF through 2 Ghz as a receiver that is also compatible with the air spy package. I will have to look up the name. It’s about $150. That unit is also compatible with most SDR interface packages (like SDR#, SDRHQ and others). Also, it can be hooked up to an external antenna and is very capable of receiving both the 2300 meter band as well as the 600 meter band (using a ferrite bar type antenna is highly recommended in both cases).
I also acquired a 30 Mhz - 2 Ghz disco antenna for other uses. However, it can work well with one of the RTL based SDR units listed above.
-Eric
From the central offices of the Technomage Guild, RF Engineering Dept.
> On Sep 11, 2020, at 4:05 PM, Steve Litt via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
>
> On Fri, 11 Sep 2020 13:13:52 -0700
> Eric Oyen via PLUG-discuss <plug-discuss@lists.phxlinux.org> wrote:
>
>> There is another use for the RaspberryPi that I have found. I use an
>> SDR here (Software defined radio) and the Pi is perfect for running
>> the control software for network connections to the device. The
>> software (available on all platforms) is called AirSpy.
>
> Please, please, PLEASE tell me exactly what hardware you use: radio
> plugin, antenna, up converter, etc. I want to dx longwave, 530-1700
> broadcast band, shortwave 1.8Mhz to 30Mhz.
>
> When you use Airspy, which executable do you use? I have the following
> executables available:
>
> /usr/bin/airspy_gpio
> /usr/bin/airspy_gpiodir
> /usr/bin/airspy_info
> /usr/bin/airspy_lib_version
> /usr/bin/airspy_r820t
> /usr/bin/airspy_rx
> /usr/bin/airspy_si5351c
> /usr/bin/airspy_spiflash
>
> If possible, what I'm going to do is exactly clone your setup, and hope
> to get your results.
>
> Thanks
>
> SteveT
>
> Steve Litt
> Autumn 2020 featured book: Thriving in Tough Times
> http://www.troubleshooters.com/thrive
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