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TELE-audiovision International — The World‘s Leading Digital TV Industry Publication

— 01-02/2015

DR or SDR#. This is a great

starting point for neophytes

to become accustomed to and

comfortable with the intrica-

cies of software defined radio.

Be sure to plug in headphones

or ear buds and listen in as

these SDR radios sound very

similar to good quality FM re-


One of the powerful features

of both SDR# and HDSDR

is the RF (Radio Frequency)

spectral display and waterfall.

These visual parameters are

of immense value to the ra-

dio hobbyist; for example the

upper spectral display can be

used to determine the band-

width, signal strength, signal

fade, waveform and distor-

tion of a received signal. The

lower or “waterfall” display is

a time recording of the sig-

nal and an indicator of signal

intensity as red indicates a

very strong signal and white

indicates a weak signal. Some

of the SDR# user options are

visible to the left such as, AF

Gain (volume control), AGC,

and slider bars to adjust the

FFT. Slider bars on the right

are to zoom in on a smaller

portion of the spectrum, wa-

terfall contrast, and speed of

7. HDSDR dashboard of NJ

101.5 on the FM band. Other FM

stations peaks are at 200 KHz


8. Two MHz scan of the

aircraft band showing peaks

at 134.2, 134.6 from pilot


the spectral/waterfall display.

Spend your first few hours

with the dongle on the FM

band and familiarize yourself

with all the plentiful features