Heathkit GR-78 - Page 13

ANTENNA,
‘Aadjst
slowly
for
a
maximum
meter
needle
reading,
When
‘the
meter
needle
ypproaching full scale (toward 5), turn
the RF GAIN contro! counterclockwise until a Fall sale
aading i obtained,
Adjust lowly for a maximum meter reading.
() Adjust the 455 kHz mixer coll for a maximum meter
Indiation with the Receiver tuned to any station on
band 8,
() Adjust the 4.034 MHz mixer col for a maximum meter
Indlation with the Receiver tuned to any station on
band F, This should take no more than a full rotation
In either direction, If you do not obtain this peak
‘within ane full rotation In ether direction, you may
have the oscillator sat to an image frequency. Return
the osciletor trimmer capacitor until the same station
1s received at a different oscillator immer setting
Thon ropeok the mixer col
() Turn the Receiver of
‘Thi
completes
tho
“Alignment
Without
Instruments,”
Proceed tothe BFO Alignment on Page 80.
ALIGNMENT WITH INSTRUMENTS
NOTE: To perform the steps In this section It ls necessary
to havo a signal generator that is capable of delivering @
rodilated signal within a frequency range of 190 kHz 1030
MH,
(1) Refer to Figure 6 (fold-out from Page 74) for the
following steps,
(
() Set the controls and switches of the Receiver as
follows
BANDSPREAD-Fully counterclockwise
AF GAIN-OFF,
RF GAIN-Fully clockwise,
RCV-STBY-RCV.
CAL=To position opposite CAL.
AMCW/SSB~AM,
AVCAVC-AVC,
‘ANL-OFF-OFF.
BAND-Bond A
TTUNING-Fully clockwis
()
Retee
tothe
inser
draving
in
the
Figure
and
connect
‘the
generator
to
the
EXTERNAL
ANT
terminals
on
the
rear
panel
of
tho
Receiver
()-
Bie
ute
the
whip
antonna
is
fully
collapd,
1.)
Turn
on
the
sana!
generator
and
allow
it
to
warn
wp.
NOTE: jn ll alignment steps, as the adjustments pebk,
tediuce the signal generator's output to the lowest possible
lov 9 a8 not to overload the Recaiver, A good output level
‘vill resut in a midseate reading on the signal strength mote.
Since
the
antenna
(ANT),
RE,
mixer,
and
oxllator
(OSC)
coils
have
been
pretuned
at’
the
factory,
only
«slight
‘adjustment
should
be
required
to
peak
them,
Perforn
the
steps
in
the
following
Alignment
Chart.
Use
the
alignment
too!
furnished
withthe
Kit
to
adjust
the
cols,