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authorAndreas Eversberg <jolly@eversberg.eu>2018-05-13 21:40:56 +0200
committerAndreas Eversberg <jolly@eversberg.eu>2018-05-21 19:42:46 +0200
commitdacf07ee9acd10c43131b1a2f656b816051a5970 (patch)
tree40986e9723fb94cb85abb7d08e81d9e25cc120a6 /docs
parent0b504dbeb3a9f3f36103685761c11961f4545373 (diff)
Work on docs
Diffstat (limited to 'docs')
-rw-r--r--docs/sdr.html56
1 files changed, 50 insertions, 6 deletions
diff --git a/docs/sdr.html b/docs/sdr.html
index 6ee5319..733a20e 100644
--- a/docs/sdr.html
+++ b/docs/sdr.html
@@ -79,18 +79,13 @@ 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.
Being about 1-10 meters away, I use the <b>gain</b> as defined above.
@@ -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>
@@ -161,6 +180,12 @@ In this case increase the sample rate (-s) to generate a wider spectrum. (--sdr-
</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".
You will see each thread. Be sure not to get too close to 100 percent.
@@ -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>
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