Codan-radio MT-4E Paging Instrukcja Użytkownika Pobierz pdf (Strona 40)

USER GUIDE | MT-4E PAGING SYSTEMS

Chapter 3: MT-4E Paging System ComponentsPage 32

PAGING REFERENCE SENSOR BOARD (OPTIONAL)

The Paging Reference Sensor Board is an additional option for the Paging Modulator (CI-PM-3) and

System Alarm Relay Board (SCARB) for simulcast systems that require high stability of paging signals.

The board works in conjunction with the paging modulator’s on-board PLL circuit. It is designed to

protect paging systems from external reference failures and indicate that a failure has occurred. The

alarm output will be triggered if the external reference fails.

POWER AMPLIFIERS

Table 3-3 shows the RF Power outputs for the transmitter modules in each frequency band.

Table 3-3: RF Power Outputs

Band Frequency Transmitter

VHF Highband 136 - 174 MHz 0.5 to 8.0 Watts

UHF 400 MHz 406 - 470 MHz 0.5 to 8.0 Watts

UHF T-Band 470 - 520 MHz 0.5 to 6.0 Watts

UHF 700 / 800 MHz 768 - 869 MHz 0.5 to 3.0 Watts

UHF 900 MHz 896 - 960 MHz 0.5 to 3.0 Watts

If a higher RF power output is required, the transmitter may be used as an exciter to drive a power

ampliﬁ er. Codan Radio Communications manufactures a 30 Watt power ampliﬁ er for VHF highband

and UHF 400 MHz, shown in Figure 3-22 that will ﬁ t into a standard subrack.

Figure 3-22: 30 Watt Power Ampliﬁ er

POWER AMPLIFIER

G/F

VSWR

RF OUTPUT

RF INPUT

PWR CTRL

FREQUENCY (MHz)

MADE IN CANADA

MODEL # CODE

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 53 54

Brak uwag

Codan-radio MT-4E Paging Instrukcja Użytkownika Strona 40