OPERATING INSTRUCTIONS
NTQA50GA
Note: These operating instructions describe the procedure for turning on and off the amplifier
output power using signal generators. This amplifier will be used with transmitters which have been
or will be certified separately. The specific transmitter instruction book should be consulted for the
correct method to use this amplifier with transmitters.
1. The input voltage range, applied to pin A1 of the DC input connector, should be between –36VDC and
–57 VDC. Pin A2 and A3 of the connector should be grounded.
2. Pin 5 of the Data I/O connector should be grounded to enable operation of the amplifier without the
data interface. Pins 1, 2, 11, and 12 on the Data I/O connector are connected to ground. Operation
with the Data I/O interface can only be performed using the transmitter software. See the transmitter
manual for instructions.
3. Connect the RF signal generator to the RF input port.
4. Connect the RF output port to the measurement equipment. Make sure the measurement equipment is
capable of handling 33 watts, or use a power attenuator or directional coupler to attenuate the signal to
a level the equipment can handle.
5. To turn on the amplifier, first apply the DC voltage with the specified range (-48 VDC nominal).
6. Apply RF power from the signal generator. Adjust the RF input power until the desired RF output
power is achieved. The amplifier’s maximum RF output power rating is 33 watts (+45.2 dBm)
7. The gain may change up to 0.5 dB as the amplifier temperature stabilizes after turn-on. Let the
amplifier warm up for 10-30 minutes, then re-adjust the power to compensate for the gain change.
8. The amplifier is now operational.
SPECIFICATIONS
Parameter Specification
Operating Frequency 1930 to 1990 MHz
Rated Output Power +45.2 dBm (33 Watts)
Gain at Full Power 48 +/- 1 dB
Input Voltage Range -36 to –57 VDC
Maximum DC Power Consumption 230 Watts
Channeling Controlled by transmitter
Modes of Transmission GSM or EDGE
Type of Modulation Not applicable (performed by transmitter)
Occupied Bandwidth and Emissions Designators
Emissions Type Amplitude Frequency Removed from Carrier
GSM (300KGXW) -30 dBc 200 kHz
-33 dBc 250 kHz
-60 dBc 400 kHz
-70 dBc 600 kHz
-73 dBc 1200 kHz
-75 dBc 1800 kHz
-80 dBc 6000 kHz
EDGE (300KG 7W) -30 dBc 200 kHz
-33 dBc 250 kHz
-56 dBc 400 kHz
-70 dBc 600 kHz
-73 dBc 1200 kHz
-75 dBc 1800 kHz
-80 dBc 6000 kHz
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