User's Manual

Radio Activity S.r.l. 17 / 44
The internal isolation between the Diversity channel and the TX is around 80dB. This allow special realization
like a duplex/simplex station:
This realization allow to operate like a normal duplex station on f1=f_rx and f2=f_tx, and also in simplex/direct
mode at f2. The soft diversity feature, obviously, in this special application is lost. More details can be asked
to Factory.
3.3.2 TX output specifications
Direct and reflected output powers are measured by a directional coupler. Power control circuit acts in a
closed loop and keeps constant the total power at MOSFET drain. If reflected power or mosfet temperature
exceeds protection threshold, regulation circuit will lower output power up to safe levels for transmitter.
Even though the TX implements many internal protections, it is recommended to connect a 50 Ohm load to
the TX port before to transmit.
An impedance mismatch at this port may produce unwanted intermodulation products or instability. So it is
recommended to verify accurately the branching system tuning before to place in service the equipment.
Play attention: a ports reversal between TX and RX or transmitting in a channel outside the branching tuning,
may destroy the RX and damage the TX!
Connector type
SMA
Nominal impedance
50 Ohm
Output power at the connector
1/5/10/15/20/25 W
RF final transistor protection to high temperature
85°C +/
-
5°C progressively reducing the RF power
Maximum power dissipation
50W
Modulation bandwidth
0 .. 5000 Hz
Synthesis step
50 Hz
Transmitting duty cycle
Continued 100%
ROS protection
Min.10’ in short circuit as well as in open circuit
Frequency stability (without GPS)
0.5 p.p.m.
Max reverse input signal
-
20dBm to avoid
intermodulation products
+20dBm no damage