81 lines
3.5 KiB
HTML
81 lines
3.5 KiB
HTML
<html>
|
|
<head>
|
|
<title>osmocom-analog</title>
|
|
</head>
|
|
<body>
|
|
<center><table border='0' cellspacing='0' cellpadding='0' width='816'><tr><td><font face="ARIAL" size='5'>
|
|
|
|
<h2><center>A-Netz</center></h2>
|
|
|
|
<center><img src="a-netz.jpg"/></center>
|
|
|
|
<p align='justify'>
|
|
Now run your base station on channel 30.
|
|
Tune the transmitter to 162.050 MHz and the receiver to 157.550.
|
|
You should tune the receiver to 164.050 first, to check if you hear the idle signal from the base station.
|
|
Then tune to actually uplink frequency 157.550 MHz.
|
|
</p>
|
|
|
|
<font size='4'><pre>
|
|
# src/anetz/anetz -k 30
|
|
...
|
|
anetz.c:170 info : Entering IDLE state, sending 2280 Hz tone.
|
|
Base station ready, please tune transmitter to 162.050 MHz and receiver to 157.550 MHz.
|
|
on-hook: ..... (enter 0..9 or d=dial)
|
|
</pre></font>
|
|
|
|
<center><img src="a-netz-display.jpg"/></center>
|
|
|
|
<p align='justify'>
|
|
Turn on you phone and wait for it to warm up (requires about half a minute).
|
|
Tune the phone to channel 30 and switch on your transmitter for the base station.
|
|
The phone should indicate a (green) light, to show idle channel.
|
|
If there is no green light, increase the level of your FM signal on the transmitter.
|
|
Or if you can't increase the audio level on the transmitter, do it with 'alsamixer'.
|
|
</p>
|
|
|
|
<font size='4'><pre>
|
|
anetz.c:244 info : Received 1750 Hz calling signal from mobile station, sending 1750 Hz acknowledge signal.
|
|
anetz.c:256 info : 1750 Hz signal from mobile station is gone, stopping acknowledge signal.
|
|
call.c:574 info : Incomming call from '' to 'operator'
|
|
anetz.c:272 info : Received 1750 Hz release signal from mobile station, sending idle signal.
|
|
anetz.c:201 info : Entering IDLE state, sending 2280 Hz tone.
|
|
call.c:695 info : Call has been released with cause=16
|
|
call disconnected: hangup (enter h=hangup)
|
|
</pre></font>
|
|
|
|
<p align='justify'>
|
|
When you pick up the phone, the phone transmits a 1750 Hz calling tone.
|
|
On reception, the base station then transmits a 1750 Hz acknowledge ton.
|
|
After that the call is establised.
|
|
After establishment, you can use the headset, if present, for speech communication with the phone.
|
|
On hangup, the phone transmit a 1750 Hz hangup tone.
|
|
Then the base station returns to idle again.
|
|
Be sure that the phone turns off the transmitter and indicates the (green) light.
|
|
</p>
|
|
|
|
<p align='justify'>
|
|
To call to the phone, be sure that your transmitter transmits loud enough to send 4 sine waves at once.
|
|
Enter the last 5 digits of the phone's number and press 'd' to dial.
|
|
If you listen to the transmit signal, you should hear 4 low pitched tones at once.
|
|
The phone should now stop the idle light and indicate an incomming call.
|
|
There is no acknowledgement from the phone until you pick up the call.
|
|
If the phone does not indicate an incomming call, increase the volume of the transmit signal, but be sure not to overdrive it.
|
|
Also be sure that you are actually dialing the right number, so the base station generates the correct paging tones.
|
|
</p>
|
|
|
|
<p align='justify'>
|
|
Instead of transmitting all 4 tones at once, they can be transmitted after each other.
|
|
Each tone is playes for a short time.
|
|
After the last tone has been played, base station starts again with the first tone.
|
|
My phone also responds to a call, even if the tones cycle rather than sent simultaniously.
|
|
In this case the level of each tone is four times highter (+6 dB).
|
|
Add command line option "-P 50" to send each tone for 50 milliseconds.
|
|
Try something between 20-100 milliseconds, if the phone still doesn't ring.
|
|
</p>
|
|
|
|
[<a href="index.html">Back to main page</a>]
|
|
</font></td></tr></table></center>
|
|
</body>
|
|
</html>
|