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ANTENNA
GND
GND
GND
GND
GND
GND
GND
N/C
CH SELECT 0
CH SELECT 1
CH SELECT 2
POWER DOWN
RSSI
GND
VCC
ANALOG
DATA OUT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
D0
D1
D2
D3
VT
DIN
OSC1
OSC2
GND
VCC
A7
A6
A5
A4
A3
A2
A1
A0
18
17
16
15
14
13
12
11
10
Channel
Select
RX1
S1
3-Position
DIP Switch
Output
to User
U2
HT694
S2
8-Position
DIP Switch
Address Select
390K
Figure 18: Typical Application - Remote-Control Receiver
PROXIMITY OPERATION
If modules are combined to form a transceiver they should be operated in half-
duplex, meaning that only the transmitter or receiver is active at any time. When
combined with certain high-gain antennas the HP-II transmitter can, in close
proximity, exceed -10dBm power into the receiver. Since the receiver does not
incorporate an AGC this can result in poor performance or complete shutdown
of the receiver. This effect occurs when both the transmitter and receiver have the
high-gain antennas connected and are in close proximity (1-5 feet) of each other.
ANTENNA
GND
GND
GND
GND
GND
GND
GND
N/C
CH SELECT 0
CH SELECT 1
CH SELECT 2
POWER DOWN
RSSI
GND
VCC
ANALOG
DATA OUT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
7
16
+
+
+
+
+
C1
4.7 uF
C4
4.7 uF
C2
4.7 uF
C3
4.7 uF
C5
220 uF
Channel
Select
RX1
3 Position
DIP Switch
10
1
3
4
5
6
2
15
2
J1
DB-9F
U2
MAX 232
5
Figure 17: Typical Application - RS-232 Interface
