FM Receiver user manual
RF Application Co.,Ltd. All rights reserved. Version 1.0 -Page 3-
Audio Connections
Be sure to observe polarity! Speaker. A loudspeaker with an impedance of 8ohms or
greater should be connected to BNC Female connector. Use of lower impedance speaker or
shorting of speaker terminal can result in IC damage. The receiver can also drive higher
impedances, such as the 1K to 20K input impedances of repeater controller boards. There is no
need to load down the output to 8 ohms.
Antenna Connections
The antenna connection should be made to the receiver with a BNC Female connector of
the low-loss type made for RF. If you want to extend the antenna connection to a panel connector,
we recommend using a short length of RG-174/u coax with the plug and keep the pigtails very
short. We do not recommend trying to use direct coax soldered to board or another type of
connector. The method designed into the board results in lowest loss practical.
Right audio output
Left audio output
Antenna input
