User Guide

PAMS
Technical Documentation
NHD–4
General Information
Page 2–8
Original 11/97
Digital Mode
Table 13. Transmitter Specifications for CDMA mode
Spurious emissions in transmit
band
–42 dBc in a 30 KHz BW for offsets > 885 KHz from center F
–54 dBc in a 30 KHz BW for offsets > 1.98 MHz from center
F
or –60 dBm/30 KHz and –54 dBm/1.23 MHz for offsets >
885 KHz from center Frequency
Spurious emissions out off transmit
band
FCC rules
TX noise floor at minimum TX pow-
er
–54 dBm/1.23 MHz (TX gate on), –60 dBm/1.23 MHz (TX
gate off)
TX noise floor with TX disabled –61 dBm/MHz for all frequencies between 824 and 849 MHz
TX noise floor at RX band with
Max. output power
–173 dBm/Hz (TBD) at RX input port
TX power control method Output_power (dBm) = –73 dBm – Receive_power (dBm) +
TX offset (dB). Open + closed loop AGC.
TX power initial accuracy +/–9 dB within value as specified by TX control method
TX duty cycle 1/1, 1/2, 1/4, 1/8 variable rate with random slots. A slot is
1.25 ms. Rate is controlled by voice activity
TX offset control method From base station with one increments or decrement every
1.25 ms (but only during active transmit slot)
TX offset control step size 1 dB +/–0.5, and +/–20% over 10 steps in same direction
TX offset range +/–32 dB (+/–24 dB step range, +/–8 dB preset offset)
Modulator type I/Q modulator, OQPSK format
Peak to rms after modulation 6 dB
I/Q Modulator phase error +/–6 deg (+/– 4 deg for D/A and filter)
I/Q Modulator gain balance +/–0.65 dB (+/–0.35dB for D/A and filter)
I/Q Modulator input level 1Vpp
Table 14 Receiver RF specification, CDMA mode
Characteristics Min Typ Max Unit
Single tone desensitization,
+/–900KHz (Note 1)
–30 dBm
Intermodulation spurious re-
sponse level
–30 dBm
Passband amplitude response
1 kHz
615 kHz
900 kHz
>900 kHz
–73
–73
–5
–3 dB
dB
dB
dB
Passband phase error
(mean
2
) response
0.03 rad
2
Receiver gain –12 91 dB
Receiver gain tolerance range
(without gain setting)
14.8 dB