458MH
Z
RF S
YNTHESISED
T
RANSCEIVER
CONNECTIONS
Pin
1
3
5
7
9
11
13
15
17
Signal
GND
NU
OOL
SOX
STX
SRX
TXON
RSSI
DIN
Direction
IN
OUT
OUT
OUT
IN
IN
OUT
IN
Description
X7000
19
MIN
IN
21
23
25
2
AOUT
NU
DOUT
RFADJ
OUT
OUT
IN
4
6
8
SIX
RST
RXON
OUT
IN
IN
0V Power Supply
Not Used
Out of Lock Signal. Output set low if synthesiser has not locked within
70mSec of TXON or RXON being applied.
Serial status Data Out. Used in conjunction with SRX
Serial status data; TTL Level 9600baud no parity
Serial set-up data; TTL Level 9600baud no parity
Set low to switch on the transmitter
Voltage logarithmically proportional to signal strength
0V=No signal, 0.7V = 0.1mV, 1.6V = 10 mV, 2.4V = 100 mV
Digital Signal :
100kΩ input impedance
DC - 9600bps
2.5V threshold
Direct Modulation :
10kΩ input impedance
DC - 9600bps
+ / - 3Vpk-pk for full deviation
Receiver Analogue Signal :
Max Deviation = 1.8V pk-pk
Bias Voltage = 2.8V
Not Used
Receiver Digital Signal. The ANOUT signal is processed and presented in
digital form.
Sets the output Power.
Floating input = Max RF Power
0.4 - 0.5V = 5 – 500mW
Low when serial status data is present on STX
Held low to reset module
Set Low to switch the receiver on. Used in conjunction with TXON:
TXON RXON FUNCTION
Low
Low
High
High
Low
High
Low
High
Transmit
Transmit
Receive
Power Down
10
12
14/16
FCNT
FDIR
MUX1/M
UX2
IN
IN
IN
High to low transition increments or decrements the RF channel.
HIGH sets FCNT to increment channel
LOW sets FCNT to decrement channel
MUX1 and MUX2 connect one of the three data inputs to the transmitter
in the following way:
MUX1 Mux2 INPUT
High
Low
High
High
High
Low
DIN
AIN
MIN
18
20
22
24
26
A
B
AIN
RDY
TRD
+VE
CD
GND
+Ve
IN
OUT
OUT
IN
OUT
IN
IN
Analogue Signal : Maximum deviation at 1Vpk-pk, bandwidth 6Hz to
4KHz, 3KΩ input impedance
Set low when synthesiser has locked
Set high when in transmit or receive
Power Supply +ve, regulated 8.5 - 14V supply.
Carrier Detect; high when an RF signal of sufficient strength is present
0 Volts
Power Supply +ve, regulated 8.5 - 14V supply.
DS007_2
Oc t 00
©2000
REG No 277 4001, ENGLAND.
Page 3
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