User's Manual

RS485 Port Connections
Table A-4. RS485 Connector: 10-Pin
Pin Description
Pin 1 RS-485 (+)
Pin 2 RS-485 (+)
Pin 3 Reserved
Pin 4 Reserved
Pin 5 USB PWR
Pin 6 USB -
Pin 7 USB +
Pin 8 RS-485 (-)
Pin 9 GND
Pin 10 RS-485 (-)
Power Amplifier
The Symbol technologies RFID part 90-power amplifier is a single stage class AB amplifier with a
nominal static drain current bias of 150mA. With the application of full RF input power, the drain current
will increase to 3.0A nominally.
Power Amplifier Specifications
Electrical Specifications
Parameter Min Typ Max Units
Operating Frequency 909.75 915.25 921.75 MHz
Output Power @ 1dB GCP 30 Watt
Small Signal Gain@7.5W 13 16 dB
Third Order Intercept Point
measured 500 kHz tone
spacing, Pout=4 watt
+56 +58 dBm
Input/Output VSWR 1.2:1 1.5:1
Noise Figure 7 10 dB