PROGRAMMING
M
U
LTIPLE REPEATERS
47
User Guide
3.
When choosing frequencies in either the TX or
RX band, take into account to have a minimum
separation of 100 kHz between frequencies in
the same band (See Figure 21). For example,
F1tx
=
451 MHz, F2tx
=
452 MHz, F3tx
=
453.2
MHz and F1rx
=
466.3 MHz, F2rx
=
466.9 MHz,
F3rx
=
468.2 MHz.
4.
When configuring three or more repeaters (with
different channels), it is recommended to have
an asymmetrical separation between the
frequencies in the same band. (See "Figure 21:
Setting Up Multiple Repeaters)" on page 47
below For the same example given in the
previous paragraph, A1
≠
A2 and B1
≠
B2.
5.
Make sure to choose different PL codes in each
channel.
Note:
For other requirements (environmental, electrical and mechanical), make sure you read sections ahead,
especially information related to equipment ventilation.
455 MH
z
10 MHz Separation
(Non - operating frequencies)
TX
RX
F1tx
F2tx
F1rx
F2rx
F3tx
F3rx
A1
A2
B1
B2
450 MH
z
465 MH
z
470 MH
z
Figure 21: Setting Up Multiple Repeaters)
2000018_B_PORS_en.book Page 47 Thursday, January 14, 2010 2:10 PM
