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@ -15,17 +15,18 @@ Two sound interfaces are required to talk and listen trough the base station usi
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</p>
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<p>
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If you want to install from GIT repository, run 'autoreconf -if' inside GIT repository first:
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As you got the source code from GIT repository, run 'autoreconf -if' inside GIT repository's directory first:
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</p>
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<pre>
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# cd osmocom-analog
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# autoreconf -if
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</pre>
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<p>
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Unpack the archive and change to its directory. Then compile:
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Then compile:
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</p>
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<pre>
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@ -109,12 +109,20 @@ But still you can add any SDR option afterwards to set or modify them.
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</pre>
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<p>
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<font color="red">Importaint: Select your RX antenna input!</font>
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</p>
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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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<font color="red">Importaint: Always use two or more channels, to avoid one channel being at the center of the spectrum!</font>
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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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@ -122,6 +130,16 @@ By creating two channels ('-k 15 -k 17') or an even number would eliminate the p
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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-spectrum.png"/></center>
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<p>
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Press 's' to get an ASCII art graph of received frequency spectrum.
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The spectrum's bandwidth is defined by the sample rate (-s) and not by the SDR sample rate!
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If you don't get nice peaks, but maybe several peaks, you might over-driven the input.
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Note that the peak will spread by the frequency deviation, so the peak might look noisy on the top.
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If the peak is quite low, check the input gain.
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</p>
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<center><img src="display-iq.png"/></center>
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<p>
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@ -135,16 +153,6 @@ If the dots are yellow, or red, the received signal may overdrive the ADC.
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Especially when the linear view shows a deformed circle (or even rectangle), reduce RX level.
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</p>
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<center><img src="display-spectrum.png"/></center>
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<p>
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Press 's' to get an ASCII art graph of received frequency spectrum.
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The spectrum's bandwidth is defined by the sample rate (-s) and not by the SDR sample rate!
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If you don't get nice peaks, but maybe several peaks, you might over-driven the input.
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Note that the peak will spread by the frequency deviation, so the peak might look noisy on the top.
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If the peak is quite low, check the input gain.
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</p>
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<p class="toppic">
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<a name="uhd"></a>
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UHD
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@ -32,7 +32,7 @@ For NMT the transmitter must be able to transmit around 463 MHz.
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</p>
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<p>
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This image shows a two-band amateur radio receiver without limitations for the frequencies above:
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This image shows a two-band amateur radio transceiver without limitations for the frequencies above:
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</p>
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<center><img src="transmitter.jpg"/></center>
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@ -51,8 +51,8 @@ I added an input to switch between two channels for the B-Netz.
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<p>
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Use radio receiver for 2-meter band to receive from A-Netz or B-Netz phones.
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Use radio receiver for 70-cm band to receive from C-Netz or NMT phones.
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The transmitter cannot be re-used, because all networks are full duplex.
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A separate radio is required to simultaneously transmit and receive.
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A trasceiver cannot be re-used, because all networks are full duplex.
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A separate receiver is required to simultaneously receive while the transmitter is transmitting.
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For A-Netz the receiver must be able to receive around 162 MHz and 157 MHz.
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For B-Netz the receiver must be able to receive around 153 MHz and 148 MHz.
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For C-Netz the receiver must be able to receive around 465 MHz and 455 MHz.
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@ -105,8 +105,10 @@ The ATX-2 power supplies are regulated on the 12 Volts rail.
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I added two plugs and a switch.
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The switch connects to the PS-On line.
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In case of an over-current, the switch can be used to reset the protection circuit.
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<font color="red"><b>
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Note that opening a switching power supply can be dangerous and may cause death.
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If you don't have the knowledge about power supplies, ask an expert to help you.
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</b></font>
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</p>
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<center><img src="power.jpg"/></center>
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