Operating instructions

24 1892 1344 - SX450G Transceiver Operator Guide v1.7 / Nov 2007
Transmitter
RF output power into 50O 500mW (HI) (+0/-1.5dB) 5mW (LO)
TX/RX switching time <25ms
Modulation input
analogue
digital
750mV p-p, AC-coupled
+3 to +12V square wave DC-coupled
Frequency response 9Hz to 3kHz at -3dB (analogue input)
(optional extended response to 6kHz for 9600 baud
GMSK)
Frequency deviation
25kHz channel spacing
20kHz channel spacing
12.5kHz channel spacing
+3.0kHz nominal (+4.0kHz max)
+2.3kHz nominal (+3.0kHz max)
+1.5kHz nominal (+2.0kHz max)
Adjacent channel power <200nW (-37dBm)
Facilities RF detect output (+5V = TX on) (HI power only)
Receiver
Sensitivity <-115dBm for 12dB SINAD (Measured with flat
audio response)
<-107dBm for 20dB SINAD (Measured with flat
audio response)
Image rejection >70dB
Intermodulation rejection >65dB
Blocking >84dB
Spurious rejection >70dB
Intermediate frequencies 45MHz and 455kHz
Adjacent channel rejection
12.5kHz channel spacing
20/25kHz channel spacing
>60dB
>70dB
Recovered audio level 600mV p-p (+20%) into 10K
Squelch type Noise operated
Squelch output NPN open collector via 470O
ON = no signal, OFF = signal present
Facilities RSSI output (0 to +3V nominal from 2K2 source)
Squelch override input
STBY input Standby current 150uA typ for HI/LO input = 0V