SDR and Shortwave Radio
Shortwave radio is radio transmission using shortwave radio frequencies.
There is no official definition of the band, but the range always includes all of the high frequency band (HF), and generally extends from 3–30 MHz (100 to 10 metres);
above the medium frequency band (MF), to the end of the HF band.
Radio waves in the shortwave band can be reflected or refracted from a layer of electrically charged atoms in the atmosphere called the ionosphere.
Therefore, short waves directed at an angle into the sky can be reflected back to Earth at great distances, beyond the horizon.
This is called skywave or "skip" propagation.
Thus shortwave radio can be used for very long distance communication, in contrast to radio waves of higher frequency which travel in straight lines (line-of-sight propagation)
and are limited by the visual horizon, about 64 km (40 miles).
Shortwave radio is used for broadcasting of voice and music to shortwave listeners over very large areas; sometimes entire continents or beyond.
It is also used for military over-the-horizon radar, diplomatic communication, and two-way international communication by amateur radio enthusiasts for hobby, educational and emergency purposes,
as well as for long-distance aviation and marine communications.
Frequency continuous coverage from 10kHz to 2GHz
12-bit ADC chip
Built-in front end filter
Spectrum bandwidth of up to 10Mhz
Similar to the SDRPlay RSP1 using EXTIO.
The arms can be made of any type of wire and virtually be hanged anywhere.
Balun 1:1 1-56MHz.
Centre fed antennas with coax (50 Ω) will need a balun to make the line symatric.
Balun of the dipole is at the highest point and the two legs come down to lower points.
The angle between the two legs should be at least 90 °, and preferably 120 °.
Adding dipoles wires for 40m, 20m and 11m bands.
Bands are added in sequence starting with the lowest band (longest wire) at the top.
And the highest band (shortest wire) at the bottom, don’t let the wires touch each other!
PVC spacers are placed 16cm apart of each wire and PVC isolators at the end of the wire.
This for sure will affect the radiation pattern as each wire interacts with the others.
We will have to shorten the legs slightly to get to the desired frequency again.
The inverted V configuration.
|Band||Length approximate (one leg)||Note
||Support Wire / Cut down to 8.50m
For Analyze and tuning a NanoVNA is used.
The dipole for 40/20/11m seems to performs well.
Note: I am not using this Antenna for Tx.
Install API/HW DRIVER – V2.13 (20TH JUN 2018) from SDR-Play website.
Download ExtIO for SDRPlay extract and put ExtIO_SDRplay_RSP1.dll in SDR# folder.
Download SDR#_ExtIO_v1.1.zip extract and put content in SDR# folder.
Choose UHD / USRP driver inside SDR#.
If you have more than one ExtIO dll in the folder, will ask which one to use.
ExtIO_SDRplay_RSP1.dll is in use for the MSi.sdr
This driver has no limitations and gives a full function SDR#, other mods cripple frequency tuning ect.
Works with 16xx/17xx Versions.
Thanks to Tof!
Download ShortWave Info and Scope SDR# Plugins
SDR Meters Plugin
40 Meter Band
20 Meter Band
SDR Console 3.21
FT8 40m Gridtracker
STANAG 4285 DECODING WITH RTL-SDR
FT8 Software and freqiencies
Freq list digf mode
FLDigi Wefax Reception
Frequenzen der Wetterdienste
Multiband Parallel Dipole
Inverted V Dipole Calculator