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@ -40,7 +40,9 @@ The network was closed for the exclusive benefit of the standard GSM in July 28t
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<p>
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<ul>
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<li>Frequency range UHF: 424.800 - 427.9875 MHz (down-link); 414.800 - 417.9875 MHz (up-link)
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<li>Frequency range UHF (Band 1): 424.800 - 427.9875 MHz (down-link); 414.800 - 417.9875 MHz (up-link)
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<li>Frequency range VHF (Band 3): 169.800 - 172.9875 MHz (down-link); 165.200 - 168.3875 MHz (up-link)
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<li>See software option "-B list" for other bands
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<li>256 voice or contol channels
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<li>Duplex distance: 10 MHz
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<li>Channel spacing: 12.5 KHz
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@ -69,6 +71,8 @@ for a description of the standard.
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<p class="toppic">
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<a name="basestation"></a>
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Setup of a base station
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<br><br>
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TBD: Tested band 1 and 3 so far!
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</p>
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<hr><center>[<a href="index.html">Back to main page</a>]</center><hr>
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@ -349,6 +349,43 @@ Refer to NMT section about configuring an NMT network.
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I highly recommend to use an SDR instead of radios connected to a sound card.
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</p>
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<p class="toppic">
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Increase performance on ARM CPUs (Raspberry PI)
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</p>
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<p>
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To see the CPU consumption of all threads, enter "top -H" into the shell:
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</p>
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<pre>
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top - 14:55:31 up 1 day, 22:27, 3 users, load average: 0,75, 0,19, 0,06
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Threads: 113 total, 2 running, 66 sleeping, 0 stopped, 0 zombie
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%Cpu(s): 30,2 us, 2,1 sy, 0,0 ni, 55,7 id, 11,2 wa, 0,0 hi, 0,7 si, 0,0 st
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KiB Mem : 949448 total, 523164 free, 134692 used, 291592 buff/cache
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KiB Swap: 102396 total, 102396 free, 0 used. 751960 avail Mem
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PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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11375 root -2 0 165148 97956 4940 R 91,1 10,3 0:24.29 nmt
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11391 root -2 0 165148 97956 4940 S 13,8 10,3 0:04.00 nmt-sdr_tx
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11392 root -2 0 165148 97956 4940 S 13,8 10,3 0:03.91 nmt-sdr_rx
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11380 root 20 0 165148 97956 4940 S 2,3 10,3 0:01.20 nmt
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11390 root -2 0 165148 97956 4940 S 2,0 10,3 0:00.58 nmt
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11389 root -2 0 165148 97956 4940 S 1,3 10,3 0:00.51 nmt
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11441 root 20 0 10056 3544 3096 R 1,3 0,4 0:00.19 top
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19768 root 20 0 10056 3272 2752 S 1,3 0,3 19:16.50 top
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67 root 20 0 0 0 0 S 0,3 0,0 0:02.80 mmcqd/0
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9913 root 20 0 0 0 0 I 0,3 0,0 0:00.04 kworker/u8:0
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1 root 20 0 28004 5916 4788 S 0,0 0,6 0:04.68 systemd
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...
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</pre>
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<p>
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In this case I use a Raspberry PI and run NMT network with multiple channels.
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It is almost at the limit, since I have around 90% CPU usage of the main thread.
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It wouldn't work to have 2 transceivers at 200KHz Bandwidth without fast math approximation.
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Use '--fast-math' to increase processing speed.
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</p>
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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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</body>
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