User's Manual

P D L U ser's G uide

APPENDIX C - TECHNICAL SPECIFICATIONS

General

Serial Port Interface

RS-232 compatible. 1200 to 38400 baud operation with 1 start, 8 data, optional parity, and one stop bit.

Power Supply

9-16 VDC. PDL Rover quiescent/receive power consumption 0.3W. PDL High Power Base

quiescent/receive power consumption is 1.9W. PDL High Power Base in the low/high RF power setting

consumes 13W/125W during transmission. The PDL Low Power Base quiescent/receive power

consumption is 0.9W. The PDL Low Power Base when transmitting consumes 5W/11W. (PDL Base

power consumption measured at 12.5 VDC.)

Radio

Frequency Ranges

Contact factory for available frequency ranges. Synthesized frequency control with approximately 1600

channel capability. Channel spacing 25/12.5 kHz. 2.5 ppm frequency reference.

Transmitter (PDL Base)

Carrier power 2-Watts or 35-Watts nominal for the High Power Base. Carrier power for the Low Power

Base is factory programmable for the 0.5W or 2W. Output impedance 50-ohms. Modulation distortion is

less than 5%. Transmitter attack time < 18 ms. Spurious and harmonic FM -55 dBc. FM hum and

noise -40 dBm.

Receiver

Sensitivity -116 dBm or better (12dB SINAD). Selectivity for the PDL HPB and Rover is >-60 dB.

Selectivity for the PDL LPB is >-70dB. (9600, GMSK, 25 KHz), and >-60 dB (19,200, 4LFSK, 25 KHz).

FM hum and noise -40 dB. Conducted spurious -65 dB. Carrier detect attack time 2 ms.

Modem

Transmission Rate

19,200 or 9,600 bits per second (Four-level FSK)

9,600 or 4,800 bits per second (GMSK)

Transmission Protocols

Transparent, packet switched, auto-repeater, fast asynchronous, Trimtalk™.

Forward Error Correction and Detection

With FEC enabled, data is encoded by a block code. The data is interleaved in blocks of 20 words, giving

burst error correction capabilities for up to 20 consecutive corrupted bits. 16-bit CRCs are generated and

sent with every block of data providing 100% error detection for burst errors shorter than 16 bits, and

99.9984% detection of all other burst errors.

Modulation

Gaussian Minimum Shift Keying (GMSK) with BT of 0.5 (4800, 9600 bps link rate). Four-level FSK

(9600, 19200 bps link rate).