Heathkit HW-12 - Operation

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OPERATION
NOTE: IT SHOULD BE NOTED THAT AN AMA-
TEUR RADIO OPERATOR AND STATION LI-
CENSE(GENERAL CLASS PRIVILEGES) IS RE-
QUIRED TO PLACE THIS TRANSCEIVER ON
THE AIR. Information regarding licensing and
amateur frequency allocations may be obtained
from publications of the Federal Communica-
tions Commission or the American Radio Relay
League,
FUNCTION OF OPERATING CONTROLS
Figure 10 contains a brief description of the
function of each control, Read the control
descriptions carefully, then proceed with the
following information.
VFO
Since the transmitter and receiver are locked
together in frequency, it ig not necessary to
Dever e SS AS SYM EEN gay a SEYS SEEU Uy OF
"zero" the receiver frequency with the trans-
mitter, Therefore, care must he taken that the
VFO dial is not disturbed during a contact be-
cause your transmitted signal frequency will
change,
RECEIVING
Operation of the Transceiver is quite simple,
since there is little tuning to do once the
alignment has been completed, Turn the Trans-
ceiver on by placing the FUNCTION switch in
the PTT position, After a short warmup period,
stations should be heard by tuning the VFOdial,
The volume is adjusted by the RF and AF GAIN
controls, With the meter switch inthe OPERATE
TUNE position the meter will indicate received
signal strength in "S" units, and db over S9.
Normally the RF GAIN control is operated at
its maximum clockwise position, where the
meter indicates the strength of received sig-
nals in S units, If signals are extremely strong,
the RF GAIN control can be reduced to give the
desired level, The S METER reading is affected
by the setting of the RF GAIN control,
TRANSMITTING
After an operating frequency has been selected
by tuning the VFO dial, place the FUNCTION
switch inthe TUNE position, turning on the trans-
mitter, With the Meter switch in the OPERATE
TUNE position, adjust the FINAL TUNE control
for a maximum indication on the meter, indicat-
ing proper tuning for maximum output power,
Transmitting with the FUNCTION switch in the
PTT or VOX position gives ameter indication of
the ALC voltage, As the operator talks, the meter
should deflect acoupie of S units, indicating max-
imum output peaks, (The Heath Monitorst ope can
be used with the Transceiver in fixed- station op-
eration to provide a visual display of trans-
mitter output.) The meter may read below the
zero mark while transmitting, without harm,
The meter switch may be placed in the BIAS
SET position while transmitting to observe plate
current variations of the final RF amplifiers.
Normal talking should produce peaks at about S6
on the meter, with loud steady tones resulting
in full-scale peaks, If the peaks of average
talking levels are above S6, the MIC GAIN is
set too high, and should be reduced to provide
the S6 level,
To keep the Transm ere in peak operating con-
dition, “it Should be adjusted periodically as di-
rected in the tig gaan section of the manual,
The BIAS control should be adjusted as directed
in the Alignment instructions, The BIAS con-
trol setting should be checked and adjusted as
necessary whenever power supplies are changed.
carrier properly nulle = s ae can ‘be
just
VOx
To use the voice controlled relay, place the
FUNCTION switch in the VOX position, Adjust
the VOX control for the microphone sensitivity
desired to turn on the transmitter. The VOX
DELAY control should be adjusted for the
hold-in time desired after the operator stops
talking. Maximum counterclockwise setting of the
control will keep the transmitter ON allthe time.
ANTENNA
The antenna must have alow SWR, since the out-
put of the Transceiver has fixed loading and a
limited tuning range, The antenna tuning should
be checked with a reflected power meter or SWR