|author||Andreas Eversberg <email@example.com>||2017-01-08 11:22:24 +0100|
|committer||Andreas Eversberg <firstname.lastname@example.org>||2017-02-18 21:00:54 +0100|
A-Netz: Option to set gain of paging tones
Diffstat (limited to 'docs/a-netz.html')
1 files changed, 9 insertions, 1 deletions
diff --git a/docs/a-netz.html b/docs/a-netz.html
index 280cad1..d91534c 100644
@@ -288,11 +288,19 @@ Also be sure that you are actually dialing the right number, so the base station
+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.
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.