Crescend Technologies LLC P2RTK450 Manual De Usuario
Crescend P2-RTK-450
Power Amplifier User Manual
1. General Information
The P2-RTK-450 is a AB class power amplifier (PA), intended to work with UHF RTK positioning systems,
amplifying phase modulated signals.
PA has the automatic gain control (AGC) loop. The gain value is set up in the factory.
PA is protected against the load mismatch and overheating. It is also protected against excessive DC power
supply voltage and DC voltage reversed polarity (for short time). PA has a current limiter, which threshold goes
down in the case of overheating.
PA provides LED indication of normal and alarm modes, as well as the combined alarm signal.
PA contains an externally controlled by-pass line, activated either when the power supply voltage is removed, or
when the special pin “SH/D” is pulled to the ground.
There is a forced air cooling system, working when the unit is in the amplifying mode.
The general parameters of RTK-450 in the normal operation mode are listed below:
Frequency range of operation (f), MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 - 470;
Input power (Pin), W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 – 2.0;
Input return loss, dB, not less than . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10;
Gain in the normal operation (G), dB, nominal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11;
Bypass insertion loss, dB, not greater than . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0;
DC power supply voltage (Vsup), V
Input power (Pin), W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 – 2.0;
Input return loss, dB, not less than . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10;
Gain in the normal operation (G), dB, nominal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11;
Bypass insertion loss, dB, not greater than . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0;
DC power supply voltage (Vsup), V
-
nominal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.8;
-
working range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.0 – 17.0;
DC current (Io), A, not greater than
-
in amplifying mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5;
- in quiescent mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8;
-
-
in by-pass mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.002;
Working ambient temperature range, ºC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 to +60;
Threshold of overheat protection activation: heat sink temperature, ºC . . . . . .. + (85 + 5);
RF connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Ohm, N (F);
DC connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . screws # 6-32 AWG.
RF connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Ohm, N (F);
DC connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . screws # 6-32 AWG.
2. Construction
The unit is intended for installation in a standard 19” cabinet rack, where it takes 4U (7.0”) in the vertical
direction. Its depth does not exceed 5”.
There are four LED at the front panel that indicate the status of unit operation.
There are two N connectors, DC block, four pins (filters) and two ground poles at the rear of chassis. Also, the fan
is placed over the heatsink at the rear.
There are four LED at the front panel that indicate the status of unit operation.
There are two N connectors, DC block, four pins (filters) and two ground poles at the rear of chassis. Also, the fan
is placed over the heatsink at the rear.