GT7800 electrical and environmental specifications

GT7800 environmental specifications

Environmental

Operating temperature

0°C to +55°C

Storage temperature

-40°C to +75°C

ESD

IEC 61000-4-2
GT7800 power requirements

Power

Voltage

+9 to +36 VDC

Power consumption

2.0 W typical

Typical values using serial port communication without interference mitigation and external oscillator disabled.
GT7800 RF Input/LNA Power Output

Radio frequency

Antenna connector

TNC, 50 Ω nominal impedance

Cascaded antenna
LNA gain (before receiver)

Firmware 7.04 and later

HDR disabled

+15 dB to +55 dB, 26 dB typical

HDR enabled

+20 dB to +55 dB, 30 dB typical

Firmware before 7.04

HDR disabled

+15 dB to +40 dB, 26 dB typical

HDR enabled

+20 dB to +40 dB, 30 dB typical

RF input
frequencies

GPS L1:

GPS L2:

GPS L5:

1575.42 MHz

1227.60 MHz

1176.45 MHz

GLONASS L1:

GLONASS L2:

GLONASS L3:

1593-1610 MHz

1237-1254 MHz

1202.025 MHz

Galileo E1:

Galileo E5a:

Galileo E5b:

Galileo E5:

Galileo E6:

1575.42 MHz

1176.45 MHz

1207.14 MHz

1191.795 MHz

1278.75 MHz

BeiDou B1I:

BeiDou B1C:

BeiDou B2I:

BeiDou B2a:

BeiDou B2b:

BeiDou B3I:

1561.098 MHz

1575.42 MHz

1207.14 MHz

1176.45 MHz

1207.14 MHz

1268.52 MHz

L-Band:

1545 to 1560 MHz1

LNA power

+5.0 VDC ±5%, 0 mA to 200 mA (supplied by receiver through center conductor of RF connector).
GT7800 external oscillator input

External oscillator

External oscillator connector

BNC

External clock input

Refer to the EXTERNALCLOCK command

Frequency

5 MHz or 10 MHz

Input impedance

50 Ω nominal

Input VSWR

<2:1

Signal level

0 dBm minimum to +13.0 dBm maximum

Frequency stability

±0.5 ppm maximum

Wave shape

Sinusoidal