83 lines
4.0 KiB
HTML
83 lines
4.0 KiB
HTML
<html>
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<head>
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<title>osmocom-analog</title>
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</head>
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<body>
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<center><table border='0' cellspacing='0' cellpadding='0' width='816'><tr><td><font face="ARIAL" size='5'>
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<h2><center>A-Netz</center></h2>
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<center><img src="a-netz.jpg"/></center>
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<p align='justify'>
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Now run your base station on channel 30.
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Tune the transmitter to 162.050 MHz and the receiver to 157.550.
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You should tune the receiver to 164.050 first, to check if you hear the idle signal from the base station.
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Then tune to actually uplink frequency 157.550 MHz.
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</p>
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<font size='4'><pre>
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# src/anetz/anetz -k 30
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...
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anetz.c:170 info : Entering IDLE state, sending 2280 Hz tone.
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Base station ready, please tune transmitter to 162.050 MHz and receiver to 157.550 MHz.
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on-hook: ..... (enter 0..9 or d=dial)
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</pre></font>
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<center><img src="a-netz-display.jpg"/></center>
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<p align='justify'>
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Turn on you phone and wait for it to warm up (requires about half a minute).
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Tune the phone to channel 30 and switch on your transmitter for the base station.
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The phone should indicate a (green) light, to show idle channel.
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If there is no green light, increase the level of your FM signal on the transmitter.
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Or if you can't increase the audio level on the transmitter, do it with 'alsamixer'.
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</p>
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<font size='4'><pre>
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anetz.c:244 info : Received 1750 Hz calling signal from mobile station, removing idle signal.
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anetz.c:256 info : 1750 Hz signal from mobile station is gone, setup call.
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call.c:574 info : Incomming call from '' to 'operator'
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... after hangup...
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anetz.c:272 info : Received 1750 Hz release signal from mobile station, sending idle signal.
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anetz.c:201 info : Entering IDLE state, sending 2280 Hz tone.
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call.c:695 info : Call has been released with cause=16
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call disconnected: hangup (enter h=hangup)
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</pre></font>
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<p align='justify'>
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When you pick up the phone, the phone transmits a 1750 Hz calling tone.
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On reception at the base station, the base station removes the 2280 Hz idle tone.
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After that the call is establised.
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After establishment, you can use the headset, if present, for speech communication with the phone.
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On hangup, the phone transmit a 1750 Hz hangup tone.
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Then the base station returns to idle again and sends the 2280 Hz idle tone.
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Be sure that the phone turns off the transmitter and indicates the (green) light.
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</p>
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<p align='justify'>
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To call to the phone, be sure that your transmitter transmits loud enough to send 4 sine waves at once.
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Enter the last 5 digits of the phone's number and press 'd' to dial.
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If you listen to the transmit signal, you should hear 4 low pitched tones at once.
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The phone should now turn off the green light and indicate an incomming call with a yellow light and a buzzer sound.
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There is no acknowledgement from the phone until you pick up the call.
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If the phone does not indicate an incomming call, increase the volume of the transmit signal, but be sure not to overdrive it.
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Also be sure that you are actually dialing the right number, so the base station generates the correct paging tones for your phone.
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</p>
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<p align='justify'>
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Instead of transmitting all 4 tones at once, they can be transmitted after each other.
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Each tone is playes for a short time.
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After the last tone has been played, base station starts again with the first tone.
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My phone also responds to a call, even if the tones cycle rather than sent simultaniously.
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In this case the level of each tone is two times highter (+3 dB), but the peak level is two times lower (-3 dB) than the peak level of 4 simultanious tones.
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Add command line option "-P 50" to send each tone for 50 milliseconds.
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Try something between 20-100 milliseconds, if the phone still doesn't ring.
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Be sure to check: Does your transmitter has enough frequency deviation (15 KHz is suggested)? Do you really send the correct number of your phone, check the frequencies of your phone and use "-D 0" option to see what 4 frequencies the base station actually transmits.
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</p>
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[<a href="index.html">Back to main page</a>]
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</font></td></tr></table></center>
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</body>
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</html>
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