Heathkit RA-1 - Installation and Operation; Front Panel Controls Guide; AM Signal Reception Procedure; CW Signal Reception Procedure

7? Ss
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FINAL ASSEMBLY AND 'S' METER ZERO ADJUSTMENT
27
( } Temporarily place a wire link between AE and E terminals.
( } Placethe RF GAIN control to maximum clockwise position and switch AVC on, Adjust the meter ZERO ADJUST
control on the rear of the receiver for a zero reading on the 'S' meter. Remove the antenna shorting link.
{ )
Inatall
four
rubber
feet
on
the
bottom
plate
as
shown
in
Pictorial
6,
Use
2BA
x
7''
screws,
lockwashers
and
nuts.
{ } Mount the bottom plate to the chassis with Na. 6 sheet metal screws.
Place the cabinet cover over the chassis and secure using four chrome plated 4BA screws,
4 P
INSTALLATION AND OPERATION
Controls
AF GAIN: Turns the receiver ON or OFF and varies the volume in the speaker or headphones.
NL: When turned to clockwise position, reduces pulse noise interference. Normally used at MIN position.
RF GAIN: Varies the amount of gain in the RF and IF amplifier stages.
Is controlled by a MODE switch when BFO is switched ON and may be used for 58B (SINGLE SIDE
BAND) or CW (CONTINUOUS WAVE) reception. Generally LSB (LOWER SIDE BAND) transmissions
the three LF amateur bands (160, 80, 40M) whilst USB (UPPER SIDE BAND} trans - ada
are made on the three LI amateur OV, Guavip Whilst ans
missions are made on the three HF amateur bands (20, 15, LOM).
USB, O, LSB:
BAND: Selects one of the six amateur bands: 160, 80, 40, 20, 15 or 10 metres.
CAL ADJ: Provides fine adjustment of
ANT TRIM: Peaks the signal at the frequency being received.
TUNING:
Tunes
in
thedesired
station.
A
slaw
motion
drive
is
incorporated,
that
whilst
permitting
fast
traversing,
allows
a
small
section
to
be
tuned
at
a
very
slow
rate.
MUTING: Two muting proviaions have been incorporated in the receiver. The first is controlled through the MUTE
terminals on the rear of the chassis. This condition would be normally used, particularly for CW and
SSB operation, for it leaves both the oscillator and BFO stages running and takes the RF and IF stages
out
of
operation.
The
second
provision
breaks
the
total
HT
supply,
and
can
be
employed
when
a
conver-
teris being used and fed from the receiver power supplies. Connection for this facility is made through
the octal plug at the rear of the chassis.
AM OPERATION
BAND switch Desired band BFO switch Off
AVC
switch
On
RF
GAIN
Maximum
clockwise
NL control MIN AF GAIN Comfortable listening level
{
}
Rotate
the
TUNING
control
until
an
AM
station
is
tuned
in.
Proper
tuning
of
the
AM
signal
willbe
indicated
by
maximum deflection of the 'S' meter.
( } Rotate the ANT TRIM control for maximum signal strength.
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NOTE:
When
listening
to
an
extremely
strong
signal,
the
RF
GAIN
control
should
be
turr
to
prevent
blocking.
CW OPERATION
BAND switch Desired band BFO switch On
MODE switch °o AVG switch OFF
AF GAIN 3 o'clock RF GAIN 3 o'clock
GLOUCESTER
rT C“( CNN :
DAYSTROM
(CTD.
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