Instruction manual

Attach a two foot or longer length of wire to the male
RCA plug and connect it to the radio antenna jack.
Install a fresh battery and turn the power ON. Make
sure that the squelch control is fully
counterclockwise and the volume control is set at
mid-position. A “rushing” noise should be heard
from the speaker when no signal is present, which is
normal. Slowly tune the radio on each band and
listen for activity. Reception will only be possible if
someone is transmitting. If you know someone with
a 2M or 6M transmitter, you should test your receiver
with known frequencies of transmission and adjust
the high frequency oscillator for proper tuning of
desired bands.
A calibrated RF generator may also be used to
adjust the oscillators. Start with the 2 meter band.
Loosely couple the output of the RF generator to the
receiver input. Turn the tuning control on the
receiver to the full counterclockwise position (lowest
frequency). With the squelch control tuned fully
counterclockwise (OFF), a “rushing” noise will be
heard. Tune the RF generator until the receiver
noise disappears and note the frequency on the
generator dial. Next, rotate the receiver tuning
control to the full clockwise position (higher
frequencies). Repeat the above procedure to
determine the upper frequency of your tuning range.
If the range is too low, decrease L4 by spreading the
turns. If the range is too high, substitute the 39pF
capacitor with the 33pF capacitor in C6. Then,
repeat both procedures to determine the upper and
lower frequency limits. With a little perseverance,
you should arrive at a range covering the 2 meter
band (144 to 148MHz). Set the generator at different
points (144, 145, 146, etc.) and tune the radio for
quieting at each setting. Mark the dial with the
appropriate values. Using the plastic alignment tool
to adjust L3, follow the same procedure for the 6
meter band (50 to 54MHz).
Note: Before the receiver is properly adjusted, you
may receive a broadcast from an FM station or TV
station. These signals will be distorted because they
are wide band FM transmissions and the AR-2N6 is
a narrow band amateur receiver.
More About Squelch
The correct adjustment of the squelch control is to
advance the control until the receiver noise is
silenced. When the receiver is tuned across the
band and a signal is found, the squelch will release
and the transmission will be heard. As you continue
tuning away from this signal, the squelch should
again come into effect and “squelch” the receiver
noise.
Frequency Counter Measurements
If a frequency counter is available, it can be used to
measure the frequency of the local oscillator at pin
20 of U1. On the 2 meter band, the counter should
read 133.3MHz to 137MHz, and on the 6 meter
band, it should read 39.3MHz to 43.3MHz.
FINAL TEST AND ALIGNMENT
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