Uniden UH-057 - Manual (Page 32)

other SELCALL Parameters.
Aside from the Transmitter and Receiver ID, you should also
know some of the SELCALL Parameters. Though, this
parameters are not frequently changed understanding them
will probably help you on your future use.
Tone Period
Tone Period is the duration of one tone in a SELCALL ID
sequence. The setting of this parameter depends on your
application. On long distance communication for example,
where the signal strength of the transmitted information is
greatly reduced and affected by noise, it is more advisable
to use longer Tone Period. Long Tone Period gives the
decoder more time and information to check and evaluate
the code.
However, BE SURE THAT ALL RADIOS IN YOUR GROUP
USES THE SAME TONE PERIOD SETTING. Otherwise
you will not be able to selectively call one another.
Sundowner UH-057 allows you to select which tone period
is best for you. It offers the four most commonly used tone
period setting (20, 40, 70 or 100 mSec}. Giving you the
freedom to change this parameter, you can adapt easily to
the existing system in your group without the inconvenience
of having it serviced by the dealer.
To change the tone period setting,
1. Press the Cs? for about 1.5 seconds. The LCD displays:
2. Select your chosen Tone Period setting from the table
below.
Key LCD Display Tone Period
0 PO 20 mSec
1 PI 40 mSec
2 P2 70 mSec
3 P3 100 mSec
UH-057 Page 30