Heathkit HW-101 User Manual

Page 120
A
(“) Set the test meter switches so the meter will indicate a
negative (-) dc voltage.
{, ) Connect the common lead of the test meter (11
megohm input voltmeter) to the chassis and the other
lead to the circuit board foil at TP (Figure 1-2) on the
screened side of the bandpass circuit board near tube
V19. If your meter reads 0 at TP, contact instead the
adjacent lead of the 100 kQ (brown-black-yellow)
resistor. A reading of -.82 V or higher is normal.
The heterodyne oscillator output will be checked at each
position of the BAND switch in the following steps. If
necessary, the heterodyne oscillator coils will be adjusted to
obtain a preliminary output voltage reading. Final
adjustment will be made later. Carefully insert the slim end
of the alignment tool fully into each slug before turning, to
avoid core breakage.
NOTE: The heterodyne oscillator crystals that are supplied
with the Transceiver provide coverage from 3.5 to 4.0 MHz,
7.0 to 7.3 MHz, 14.0 to 14.5 MHz, 21.0 to 21.5 MHz, and
28.0 to 30.0 MHz. As the driver grid and driver plate coils
must be sequence-tuned (because of their series-parallel
arrangement) other heterodyne crystals for out-of-band
oneration could introduce a wide variety of nassible tunina
ailO cou OOuCce ery pA Bg Lo em Be ET g
a
3740 kHz and 21,200 kHz.
(¥) With the BAND switch at 3.5, the test meter should
indicate about -0.5 to -2 volts dc. If necessary, adjust
coil 3.5 (near tube V11 on the top side of the RF
driver circuit board) to bring the voltage into this
range. NOTE: When adjusting this coil in one
direction, the oscillator output voltage will change
rapidly; when adjusting the coil in the opposite
direction from the peak, the output voltage will
change slowly, Adjust the coil in the direction that
gives the slower change in output voltage.
( ¥) Similarly, check the heterodyne oscillator output
voltage at all positions of the BAND switch. If
necessary, adjust the correct heterodyne oscillator coil
for any BAND switch position that does not give an
indication of about -0.5 to -2 volts de on the test
meter. The heterodyne oscillator coils for bands 3.5,
14, and 28.5 are marked, and adjusted at the top side
of the RF driver circuit board; the coils for the other
bands are marked on the shield cover, and are adjusted
from the bottom of the chassis,
(¥) Turn both VFO trimmer capacitor screws (through
two hoies on the feft side of the VFO chassis)
clockwise until just snug. Then turn each capacitor
screw counterclockwise one-quarter turn.
(¥}
Set
the
FUNCTION
switch
to
CAL
and
the
BAND
switch
to
3.5;
then
turn
the
MAIN
TUNING
dial
back
and
forth
around
400
to
get
a
calibrator
signal.
Check
for
the
calibrate
signal
by
turning
the
FUNCTION
switch
to
VOX
and
back
to
CAL;
the
signal
should
stop
and
then
start
again
and
should
peak
with
the
DRIVER
PRESELECTOR.
( VN) Reset the DRIVER PRESELECTOR to the 12 o'clock
noasition
HOSsION,
{, } Disconnect the test meter leads from the Transceiver
The S Meter will be used as an output indicator during the
remaining alignment of the Transceiver and the 100 kHz
calibrator will be used as a signai source.
When adjusting the transformers in the following steps, use
the large end of the tuning tool for the top core. Use the
long, thin end (which is inserted through the top core) for
the bottom core.
CAUTION: The 6.8 MHz trap coil is sealed, and should not
be turned.
NOTE: It should not be necessary to turn the cores of
transformers T201 and T103 more than two turns.
(4) Adjust transformer T201 for maximum volume.

Heathkit HW-101 Specifications

General

Brand	Heathkit
Model	HW-101
Category	Transceiver
Language	English