R1.1
Copyright © 2016 SDRplay Limited
14
SDRuno User Manual
3.14
RDS “DX-mode”
RDS data is transmitted in pieces called “RDS groups” and each group is composed of four “RDS blocks”.
To obtain valid data the RDS decoder must achieve “synchronization” first; this means that a correct
sequence of blocks “A” to “D” must be validated by the embedded error correction system. In very poor
S/N ratio (approximately below 11-12 dB) this is impossible. In normal use this is usually not a great
concern but for DX enthusiast it is, as the main goal is the identification of the broadcaster by the RDS PI
data. PI data is embedded at least in all “Block A” of any RDS groups so it is one of the more redundant
pieces of information transmitted. In RDS “DX-mode” SDRuno tries to extract the PI by attempting a
partial synchronization, then the relative PI data is shown in red. The level of confidence is very high (>
99.5%). The RDS decoder exits “DX-mode” once full synchronization is achieved and the PI label returns
to its normal state. In order to re-enter DX-mode you have to reset the decoder by the RESET button in
the RDS Info window. For marginal signals DX-mode can be a very useful tool.
3.15 IQ Wav files maximum length
The user has an option to define a custom file length up to 4 gigabytes (10243 bytes) which is the limit of
the wav format itself. In fact, in the Wav file header size is stored as a 32 bit unsigned integer so the
storable maximum size is 2^32 bytes. In the future SDRuno will offer the option to store IQ data in another
format, without the above limitations. Please note that the advantage of keeping the wav format is
compatibility: SDRuno files can be opened with any tools that support that file format. To change the
default file size (2048 megabytes) go to Main->SETT.-
>MISC, double click on the “WAV FILE MAX
RECORD LEN” and enter the new size, then press Enter to confirm.
4.
“Hidden” functions in SDRuno
4.1 Selecting the recording folder
Right-click on the Recorder button in the Main window or on the Recorder window: this will pop up the
folder selection window. The factory default is to u
se your “My Documents” folder.
4.2 Using the custom controls
SDRuno implements some custom controls specifically created for it.
4.2.1
Sliders
Sliders are used for some parameters such audio level, squelch level etc.
You have several options to modify a slider value:
-
For quick, large changes simply click in the new position of the slider
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For continuous variations click and drag.
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For fine, precise control put the cursor inside the slider and turn the mouse wheel
