select a demodulation or decoding mode at the main window right below
operating:
mouse click spectrum above:
The new frequency is the pointed frequency aligned to 1 kHz grid.
mouse click spectrum below:
The new frequency is the pointed frequency not aligned.
mouse wheel spectrum above:
The frequency is increased/decreased by 1 kHz.
mouse wheel spectrum below:
The frequency is increased/decreased by 100 Hz.
arrow left/right
The tuningstep is increased/decreased to the next intern defined step.
(1 Hz, 10 Hz, 100 Hz, 1, kHz, 2.5 kHz, 5 kHz, 6.66 kHz, 9 kHz, 10 kHz, 25 khz, 50 kHz, 100 kHz)
arrow up/down
The frequency is increased/decreased by one tuningstep.
align - button "l"
The frequency will be aligned to the tuningstep grid.
direct edit - buttons:"0".."9" "k" "enter" "m" "h" "esc" ","
With "enter" or with "k" the frequency will be changed with kHz as unit. With "m" the unit is Mhz, with "h" Hz. "esc" will be escape the last edit and the
old value will not be overwritten.
For the broadcast example Deutsche Welle 6075 kHz: "6" "0" "7" "5" "enter" -or- "6" "," "0" "7" "5" "m"
main tuning - button: "a"
The oscillator frequency will be changed directly the IF frequency will be changed indirectly.
The input range in the upper window will be changed due to this. If the new frequency is not supported by the oscillator the IF frequency
will be also changed by a small offset.
disadvantages:
only slow tuning because data has to be send to the receiver
strong glitches will be produced by some receiver
intermediate tuning - button: "i"
The intermediate frequency will be changed directly the oscillator frequency will be changed indirectly.
Within the inputspectrum you can select a frequency. If you are close to the feft or right border the oscillator frequency will be also changed.
advantage:
fast tuning is available
mirror tuning
Some receiver produce mirror frequencies with this option you can tune very easy to the true frequency, vice versa, if you have the true frequency you can find all
mirror frequencies.
searching
The receiver search a new frequency. The conditions for the the stop are internaly defined by ca. 20 dB SNR.
shifting
For the optimising of the distance to interfering signals. The oscillator and the IF frequency will be changed together to lock the main frequency to
the equal frequency. But a potentially interfering signal will be moved to outside of the filterborders.
oscillator lock - mlock
If activated the oscillator frequency can not changed anymore. Then the intermediate tuning is available only.
Use this if you use the intermediate tuning and you dont want to change the oscillator frequency.
antenne/input selector
Some receiver supports multiple inputs. Here you can choose any of this.
attenuation selector
Some receiver supports multiple attenuations. Here you can choose any of this.
receiver options
Some receiver supports any other options. Here you can choose any of this. See receiver descriptions.
impulse noise blanker - iNB
Strong glitches that will be get from oscillator frequency change or from antenna by man made noise by switches will be here suppressed.
IQ-Balance - IQbal
IQ receiver must have for the I- and Q- channel (inphase , quadraturephase) the exactly same phase and amplitude behavior for the whole inputspectrum and the whole
path from IQ-mixer to the AD-converter. Otherwise some pseudo frequency will be displayed and heareable.
Here a algorithm correct this behavior.
DC offset filter - DCfilt
A potentially missing DC filter can produce a stable spectraline at the upper window. This will influence the behavior of searching and demodulation.
With this option you can filt out the DC by software.
known problems, questios and answers:
DRM is not operating with 192 khz samplerate
with version 0.072 this problem is solved
that is the DRM decoding performance?
since version 0.060 close to DREAM, practically the performance is the same
The DRM signal is good but the decoder is not working
DRM mode C und mode D are not supported at this tiome
sometimes synchronisation is wrong, use "reset" button
the audiocodec is not supported
How can i receive the VHF FM? The receiver range is only up to 30 MHz.
you need a second receiver with 10.7 MHz IF output signal and a soundcard with 192 kHz samplingrate
plug this signal to your receiver, select 10.7 MHz with SoDiRa
choose FM mode
Is the DCF77 time ecactly?
about 50 - 200 ms is the differences
The DCF77 time is not taking over after "synchronise systemtime"
