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| -rw-r--r-- | scenarios.tex | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/scenarios.tex b/scenarios.tex index 7366fae..0e3c750 100644 --- a/scenarios.tex +++ b/scenarios.tex @@ -21,7 +21,7 @@ odr-dabmod myfirst.eti -f myfirst.iq -n 1 This will create a file containing 32-bit interleaved I/Q at $2048000$ samples per second. Where the maximal amplitude is bounded by 1.The transmission mode -is defined by the ETI file. +is defined by the ETI file. The equivalent configuration file would be \begin{lstlisting} @@ -147,17 +147,11 @@ correct power is reached. \label{otherhardware} ODR-DabMod supports other radio interfaces using SoapySDR or through standard output, or via a fifo -- the latter must be created prior to runtime with the \texttt{mkfifo} command. -Due to limitations in the UHD driver library, \texttt{/dev/stdout} will only -function correctly if ODR-DabMod is configured at compilation time with the -following argument: - -\begin{lstlisting} ---disable-output-uhd -\end{lstlisting} SoapySDR\footnote{\url{https://github.com/pothosware/SoapySDR/wiki}} is a vendor neutral and platform independent library to drive SDR devices. It can be used to -drive the LimeSDR board and the HackRF from Great Scott Gadgets. Installation +drive the LimeSDR boards, the HackRF from Great Scott Gadgets and the Fairwaves +XTRX devices, among others. Installation dependencies are shown in the \texttt{INSTALL} file, and an example configuration is in \texttt{doc/example.mux}. The TX Gain setting should be chosen inside the valid range for the device being used. This range can be shown @@ -177,7 +171,11 @@ both particularly important. To use the HackRF through stdout (i.e.\ without SoapySDR), the output of ODR-DabMod must be set (in the configuration file) to produce 8-bit signed integers, rather than the default complex floats. -HackRF has selectable baseband filters, however the lowest filter setting +\footnote{UHD versions before 3.12 output a version string to standard output +at startup. This interferes with all ODR-DabMod usage with \texttt{/dev/stdout} +as output, and will only function correctly if ODR-DabMod is configured at +compilation time with UHD disabled.} +The HackRF has selectable baseband filters, however the lowest filter setting ($1.75$MHz) does not provide adequate image rejection at the native sampling rate of $2048$k samples per second. An appropriate rate to start with is $4096$k, and for some purposes this may well be adequate as this moves the image signals |