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A-Netz: Option to set gain of paging tones

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Andreas Eversberg
2017-01-08 11:22:24 +01:00
parent d28467c125
commit bf0abd627d
6 changed files with 46 additions and 29 deletions
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docs/a-netz.html
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@@ -287,12 +287,20 @@ If the phone does not indicate an incoming call, increase the volume of the tran
Also be sure that you are actually dialing the right number, so the base station generates the correct paging tones for your phone.
</p>
<p>
As there is no emphasis, a transmitter with pre-emphasis will drastically lower the paging tones.
If you cannot disable pre-emphasis on the transmitter, try to raise the gain of the paging tones.
Add command "-V 12" to increase gain.
The frequency deviation of all 4 tones should be around 11 kHz.
</p>
<p>
Instead of transmitting all 4 tones at once, they can be transmitted after each other.
Each tone is plays 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 simultaneously.
In this case the deviation level of each tone is two times higher (+6 dB). (The level transmitted is two times lower (-6 dB) than the peak level of 4 simultaneous tones. This may help transmitters with deviation limiters to make the phone ring.)
In this case the deviation level of each tone is four times higher (+12 dB).
This may help transmitters with deviation limiters to make the phone ring.)
Add command line option "-P 100" to send each tone for 100 milliseconds.
Try something between 50-200 milliseconds, if the phone still doesn't ring.
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.