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@ -79,17 +79,12 @@ In case of B-Netz, I use the following parameters:
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--sdr-rx-gain 30 \
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--sdr-rx-gain 30 \
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--sdr-tx-gain 30 \
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--sdr-tx-gain 30 \
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--sdr-samplerate 5000000 \
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--sdr-samplerate 5000000 \
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--sdr-bandwidth 15000000 \
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-s 100000 \
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-s 100000 \
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-k 17
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-k 17
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</pre>
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</pre>
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<p>
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Be sure to select the right RX antenna input.
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The frequencies we use require the low frequency filter network, so I suggest to connect your antenna to RX_1_L and select "--sdr-rx-antenna LNAL".
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Different versions of LimeSuite have different default antenna inputs, so be sure to set your RX antenna.
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</p>
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<p>
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<p>
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In order to change from analog sound card to SDR, you need <b>--sdr-soapy</b> option.
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In order to change from analog sound card to SDR, you need <b>--sdr-soapy</b> option.
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In my setup I use antennas directly connected to the SDR.
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In my setup I use antennas directly connected to the SDR.
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@ -103,6 +98,30 @@ Note that channel 19 is not given here, but will be used automatically.
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With B-Netz, the transmitter switches from any voice channel to the paging channel (19) whenever the phone gets paged.
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With B-Netz, the transmitter switches from any voice channel to the paging channel (19) whenever the phone gets paged.
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</p>
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</p>
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<p>
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Alternatively you can have these options pre-set by just a single option: <b>--limesdr</b>
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But still you can add any SDR option afterwards to set or modify them.
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</p>
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<pre>
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# bnetz --limesdr -k 17
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</pre>
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<p>
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Be sure to select the right RX antenna input.
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The frequencies we use require the low frequency filter network, so I suggest to connect your antenna to RX_1_L and select "--sdr-rx-antenna LNAL".
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Different versions of LimeSuite have different default antenna inputs, so be sure to set your RX antenna.
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</p>
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<p>
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My LimeSDR setup causes a bad RX signal, when the RX frequency of the channel (uplink) equals the center frequency of the RX spectrum.
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This center frequency is used as RX frequency, when only one channel is created for the base station.
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By creating two channels ('-k 15 -k 17') or an even number would eliminate the problem.
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The center frequency is between the channels now.
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</p>
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<center><img src="display-iq.png"/></center>
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<center><img src="display-iq.png"/></center>
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<p>
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<p>
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@ -160,6 +179,12 @@ The software will notice you, if the channels wont fit into the spectrum.
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In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-samplerate must not need to be changed)
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In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-samplerate must not need to be changed)
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</p>
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</p>
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<p>
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If multiple channels are defined, the channel type for the first channel is automatically set to the control channel,
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the other channels to voice channels.
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You may still alter this by specifying channel type for each channel.
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</p>
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<p>
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<p>
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Note that the CPU usage increases for the main thread.
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Note that the CPU usage increases for the main thread.
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I suggest to monitor the usage using "top -H".
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I suggest to monitor the usage using "top -H".
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@ -181,6 +206,7 @@ Because C-Netz uses only odd channel numbers for 10 KHz spacing, we use channel
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--sdr-rx-gain 30 \
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--sdr-rx-gain 30 \
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--sdr-tx-gain 30 \
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--sdr-tx-gain 30 \
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--sdr-samplerate 5000000 \
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--sdr-samplerate 5000000 \
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--sdr-bandwidth 15000000 \
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-s 100000 \
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-s 100000 \
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-k 131 -k 135 \
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-k 131 -k 135 \
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-C 0,0
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-C 0,0
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@ -203,6 +229,24 @@ Transmit PAL 'FUBK' test image on TV channel 21.
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</pre>
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</pre>
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<p>
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<b>Example: Receive or transmit a radio broacast channel</b><br>
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Receive radio station at 105.6 MHz with German stereo carrier (Pilot-Tone) and output it on sound card 0, device 0.
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If you replace <b>--rx</b> by <b>--tx</b>, you will transmit from sound card.
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</p>
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<pre>
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# osmoradio --limesdr \
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-f 105600000
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-M fm
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-s 500000
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-S
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-a hw:0,0
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--rx
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</pre>
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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</td></tr></table></center>
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</td></tr></table></center>
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</body>
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</body>
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