User's Manual

Shenzhen Friendcom Te
chnology Development Co., Ltd.
Table 1
3.1 Pin Assignment
As to FC-302V radio, the pin assignment is shown in Table 2.
Table 2
P
i
n
N
a
me P
i
n N
o
. D
es
cription Remark
AUDIO_IN
（MOD IN）
1
Audio input. 3KHz LPF,
Modulation sensitivity is 100mV.
AUDIO_IN is effective only when PIN
7(MIC) is vacant or with +5V high level.
3KHz LPF filter existed in audio channel.
A
U
DI
O_
OUT
（A
F
OUT）
2
Audio output, 3Khz
LPF. Output level
at 60% frequency
deviation is
250±50mV. This line has an internal
pull
-up resistor to +5V
.
PT
T 3
TX control, active
low, only when PTT
is active AUDIO
_IN and MIC IN are
effective. Thi
s line has an internal pull-
up to 5V.
B+
(9.5
～16V DC)
4
Positive
pole input from DC power,
nominal +12V.
PROG
(DATA OUT)
5 Progr
amming data output, 5V TTL
BUSY 6
Logical level outp
ut to indicate whether
there is a carrier o
r not. Low lever =
car
r
i
er
,
h
i
g
h l
evel=no carrier. This line
has a pull-up to +5V.
MIC IN/RSSI 7
MIC IN: M
icrophone input.
RSSI: To detect the air signal strength.
Jumper selectable.
Can directly connect to electrets MIC, the DC
voltage of this pin should lower than 3.5V,
then MIC transmission can be activated.
PROG
(DATA IN)
8 Progra
mming data input, 5V TTL
SPK/
POCSAG
9
SPK: Audio ou
tput from the audio
amplifier, @ 8Ω.
POCSAG:
T
o
tr
a
n
s
m
it P
O
C
S
AG code.
Jumper selectable.
AUDIO_IN is effective only when PIN
7(MIC) is vacant or with +5V high level.
3KHz LPF filter existed in audio channel.
10
11
12
13
14
Ground
15
6
NC
GND
NC
NC
NC
NC