Yaesu FR-50B, Instruction Manual

Page: 7 / 22

Page 7 of 22
OPERATION OF RECEIVER
The following operating conditions should be observed.
1. Antenna
The antenna input impedance of the FR-5OB is 50 - 70 ohms. Use a
matching antenna with coaxial lead-in. The receiving sensitivity
is directly dependent on the quality of the antenna. However, a
length of wire will suffice for casual listening.
2. Speaker
As the output impedance is 4 ohms, a speaker impedance close to
this is recommended.
For headphone use, connect the leads to the plug supplied. Low
impedance, 4 - 16 ohms, headphones should be used.
AM RECEPTION
Position of Controls
Mode Switch:
AM
Preselector: Set to noise peak
Band: Desired Band
RF GAIN: Maximum
AF GAIN: For suitable volume
ANL: Off
CALIB: Off
Monitor: Minimum position
AGC: Fast
CH-select: VFO
Main dial may be accurately set for each band at the 100 kHz points
with the aid of a crystal calibrator and adjusting the zero set
control to zero beat.
Turn the main tuning knob to receive the desired signal and adjust
for maximum "S" meter reading, then peak with pre-selector. When
impulse noise such as generated by auto ignition systems is strong
switch on ANL. The tuning knob has 50 graduations, and one
revolution of the knob covers about 50 kHz on each band, except 28
MHz where one revolution covers about 100 kHz.
3. SSB & CW Reception
Set knobs to the same position as above, except the mode switch is
set to the SSB/CW position.
Tune for maximum "S" meter indication, then adjust BFO PITCH to
resolve the SSB signal, or, for CW, to obtain a comfortable
listening tone. Most SSB stations use LSB on 80 and 40 meters and