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This commit is contained in:
Andreas Eversberg
2016-10-02 09:01:12 +02:00
parent b07509cf2d
commit 50e311590a
3 changed files with 17 additions and 6 deletions
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docs/nmt.html
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@@ -621,11 +621,13 @@ The phone stores the new traffic area and acknowledges the release request.
<p>
Level adjustment:
We see a receive level of around 182%.
Tune your receiver to the up-link frequency, so you get loop-back of base station broadcast.
Use the variable resistor (connecting your transmitter) to adjust the volume until the received level matches the same level of your previously received bust.
Tune your receiver to the donw-link frequency, so you get loop-back of base station broadcast.
Use the variable resistor connecting your transmitter, to adjust the volume until the received level matches the same level you previously received from the phone.
In my case I adjust the transmitter to match around 182%. (+- 10% is good)
Now, whatever frequency deviation the phone transmits for signaling, so does your base station. Use the other variable resistor (connecting your receiver) to adjust the volume until the level matches about 100%. (+- 10% is good)
Switch back the receiver to up-link frequency and change the traffic area to see the result of your adjustment.
Now, whatever frequency deviation the phone transmits for signaling, so does your base station, because you receive the same level from your base station as you did from the phone.
Use the other variable resistor connecting your receiver, to adjust the volume until the level matches about 100%. (+- 10% is good)
Now, your base station receives the correct frequency deviation as 100%. Also voice levels are now adjusted right.
Switch back the receiver to up-link frequency and change the traffic area to see the result of your adjustment as the phone registers.
</p>
<p>