FM T
RANSMITTER
& R
ECEIVER
M
ODULES
. (2
ND
G
ENERATION
)
Module test circuits
FM-TX2-XXX
FM-RX2-XXX
fig.5: TX2 test circuit
fig.6: RX2 test circuit
∗
The PNP transistor enables a CMOS compatible Carrier Detect signal to be derived from pin 3. If no CD signal required
pin 3 should be connected directly to pin 5 (Vcc)
Module mounting considerations
The modules may be mounted horizontally or vertically on an area of ground plane preferably
close to the antenna to minimise feed length. The receiver and it’s antenna should be kept away
from sources of interference (micro’s, SMPS etc.). The modules may be potted if required in a
viscous compound which can not enter the screen can..
Warning:
Do NOT wash the modules. They are not hermetically sealed.
DS000022
Rev D
July ‘99
©1999
REG No 277 4001, ENGLAND.
Page 6