forked from cellular-infrastructure/osmocom-analog
Work on docs
This commit is contained in:
parent
0b504dbeb3
commit
dacf07ee9a
|
@ -79,17 +79,12 @@ In case of B-Netz, I use the following parameters:
|
|||
--sdr-rx-gain 30 \
|
||||
--sdr-tx-gain 30 \
|
||||
--sdr-samplerate 5000000 \
|
||||
--sdr-bandwidth 15000000 \
|
||||
-s 100000 \
|
||||
-k 17
|
||||
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
Be sure to select the right RX antenna input.
|
||||
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".
|
||||
Different versions of LimeSuite have different default antenna inputs, so be sure to set your RX antenna.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
In order to change from analog sound card to SDR, you need <b>--sdr-soapy</b> option.
|
||||
In my setup I use antennas directly connected to the SDR.
|
||||
|
@ -103,6 +98,30 @@ Note that channel 19 is not given here, but will be used automatically.
|
|||
With B-Netz, the transmitter switches from any voice channel to the paging channel (19) whenever the phone gets paged.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Alternatively you can have these options pre-set by just a single option: <b>--limesdr</b>
|
||||
But still you can add any SDR option afterwards to set or modify them.
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
|
||||
# bnetz --limesdr -k 17
|
||||
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
Be sure to select the right RX antenna input.
|
||||
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".
|
||||
Different versions of LimeSuite have different default antenna inputs, so be sure to set your RX antenna.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
My LimeSDR setup causes a bad RX signal, when the RX frequency of the channel (uplink) equals the center frequency of the RX spectrum.
|
||||
This center frequency is used as RX frequency, when only one channel is created for the base station.
|
||||
By creating two channels ('-k 15 -k 17') or an even number would eliminate the problem.
|
||||
The center frequency is between the channels now.
|
||||
</p>
|
||||
|
||||
<center><img src="display-iq.png"/></center>
|
||||
|
||||
<p>
|
||||
|
@ -160,6 +179,12 @@ The software will notice you, if the channels wont fit into the spectrum.
|
|||
In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-samplerate must not need to be changed)
|
||||
</p>
|
||||
|
||||
<p>
|
||||
If multiple channels are defined, the channel type for the first channel is automatically set to the control channel,
|
||||
the other channels to voice channels.
|
||||
You may still alter this by specifying channel type for each channel.
|
||||
</p>
|
||||
|
||||
<p>
|
||||
Note that the CPU usage increases for the main thread.
|
||||
I suggest to monitor the usage using "top -H".
|
||||
|
@ -181,6 +206,7 @@ Because C-Netz uses only odd channel numbers for 10 KHz spacing, we use channel
|
|||
--sdr-rx-gain 30 \
|
||||
--sdr-tx-gain 30 \
|
||||
--sdr-samplerate 5000000 \
|
||||
--sdr-bandwidth 15000000 \
|
||||
-s 100000 \
|
||||
-k 131 -k 135 \
|
||||
-C 0,0
|
||||
|
@ -203,6 +229,24 @@ Transmit PAL 'FUBK' test image on TV channel 21.
|
|||
|
||||
</pre>
|
||||
|
||||
<p>
|
||||
<b>Example: Receive or transmit a radio broacast channel</b><br>
|
||||
Receive radio station at 105.6 MHz with German stereo carrier (Pilot-Tone) and output it on sound card 0, device 0.
|
||||
If you replace <b>--rx</b> by <b>--tx</b>, you will transmit from sound card.
|
||||
</p>
|
||||
|
||||
<pre>
|
||||
|
||||
# osmoradio --limesdr \
|
||||
-f 105600000
|
||||
-M fm
|
||||
-s 500000
|
||||
-S
|
||||
-a hw:0,0
|
||||
--rx
|
||||
|
||||
</pre>
|
||||
|
||||
<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
|
||||
</td></tr></table></center>
|
||||
</body>
|
||||
|
|
Loading…
Reference in New Issue