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TO 31R2-2TRC199-1
Change 1
1-4
Figure 1-1
Figure 1-2. Receiver-Transmitter RT-1695/TRC-199
1-1.2.4
Diplexer.
(See Figure 1-3.) The tactical repeater diplexer provides a method of using a receiver and a transmitter on a common
antenna. The diplexer, when properly tuned, provides a transmitter-to-receiver isolation of 70 decibels (dB) at any
frequency spacing of 4 MHz or 3% of the operating frequency, whichever is greater. The diplexer has an insertion loss
of less than 2.25 dB between the transmit port and the antenna and less than 3.0 dB between the receive port and the
antenna. The diplexer is capable of handling 60 watts of radio frequency (RF) power in the transmit path and provides
protection at the receive port to limit receive signals to a maximum level of +33 power in decibels (referenced to 1
milliwatt) (dBm). There are three separate diplexers, one for each frequency band. The frequency band of the diplexer
must correspond to that of the receiver-transmitter and antenna.
Legend for Figure 1-3
(136-174 MHz and 403-470 MHz diplexers have the same controls, but their appearance is slightly
different):
1
Tuning Meter
2. SENS Control
3. RCV Control
4. XMT Control
5. TUNE Switch
Figure 1-3. Diplexer Front Panel (30-88 MHz)
Содержание AN/TRC-199
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