Panasonic RF -4800 Operating Instructions Manual page 13

Panasonic
Operating Instructions
RADIO RECEIVER ANTENNA SYSTEM
MODEL NO.
RD-9820
Read these instructions completely before operating.
- - - - - - - - G E N E R A L DESCRIPTION--------
Antenna Coupler
The Antenna Coupler serves as a matching device to connect the antenna to the radio in
such a way as to obtain optimum signal transfer. Reception is enhanced and signal loss is
reduced when the impedance of the antenna and the impendance of the receiver's radio
frequency (RF) input stage are the same. It is normal for an antenna and a radio to exhibit
different impedances for different radio wavelengths (frequencies). To overcome thiS
condition, the Antenna Coupler is installed between the antenna and the radio, and adjusted
to obtain a suitable match.
This Antenna Coupler is designed for reception of all types of radio signals ranging from
0.5 MHz to 30 MHz, and for coupling either a balanced, or an unbalanced type of trans-
mission line.
Antenna
The antenna furnished in this system is an inverted-L, long-line type, with an unbalanced
transmission line. It comes complete with a lightning arrester and grounding system.
This type of antenna is one of the easiest to install and use. Its design is a recognized stan-
dard.