Heathkit HW-12 - Page 42

4, Set the dials of the receiver and Transceiver
to +o megacycles, The receiver should he
10 7 ae YOLES, 2425 TCes vel So
operated in the CW mode,
or
ry
Adjust coil L5 until the Transceiver signai
is heard in the amateur receiver speaker.
Check the VFO diai calibration by setting
the dials of both ¢ the receiver and Tran-
xe a cant
ceiver first to Bos megacycles and then to
40 megacycles, The calibration should
elheelt wnoavr theses nointe menee saad
CUICCR lear WESC PULILS, and aly Ulal
variations should be corrected by adjust-
ing coi as C131B
mg coil LS at ti megacycles and C131B
the trimmer on the VFO variable capac-
trav at AM maennvalaa
ul Ot eV AIT Han yusco,
he e
6. Turn the FUNCTION switch to OFF.
CRYSTAL CALIBRATOR CHECK OF VFO DIAL
SETTINGS
The preceding adjustments of the VFO will only
be as accurate as the receiver used. The cali-
bration can be accurately checked by using the
Heath Model HRA~10-1 Crystal Calibrator as an
accessory. with the Transceiver, The Crystal
Calibrator accuracy should be checked against
WWYV by using a receiver other than the one in
the Transceiver to set the calibrator at 5, 10,
ane ee meen te
or 15 megacycles,
1, Plug the Crystal Calibrator into the cali-
brator socket of the Transceiver,
ntothe ANT socket
= ote cxet,
1 in the PTT posi-
n the OPERATE
10 VS Est
«
tinn and the Motor
eter
ULUli, Usa WAS ave
TUNE position.
3. Turn on theCrystal Calibrator by pulling the
AF GAIN control knob "out.’' Allow suf-
ficient time for the Calibrator to warm up.
uracy of the VFO
VY Ve Way
and eet ese yele settings
t eiver Any dial
vee
Wee an
<
2B
me
n nm Bt
aE
bimine® on the VEO ¢
megacycles, Rene
wey Aad
with the calibrator signals,
at renee eat ire “ks
tonpeal
5, Turn the FUNCTION switch to OFF.
TRANSMITTER ALIGNMENT
BIAS SETTING
1, Connect the dummy load to the ANT socket.
5.
Remove V5, the 12BY7 tube,
Set the FUNCTION switch to TUNE and the
Meter switch to BIAS SET.
Then adjust the FINAL BIAS control for a
reading of S3 on the meter, There is a
small triangle above the ''3'' on the meter
to indicate the proper bias setting,
Turn the FUNCTION switch OFF, and re-
place V5, the 12BY7 tube,
RF AMPLIFIER ADJUSTMENT
1,
st t
dummy load or with the VI'VM RF probe
the dummy 1
Connect a voltmeter across the dummy
load, if your dummy load provides a DC
voltmeter connection, or use a VI'VM with
an RF probe positioned near the dummy
load. Do not connect the RF probe to the
dummy load as there is sufficient voltage
output to burn out the diodes of some RF
probes,
LG
With the VFO dial set to 3-8, place the
FUNCTION switch in the TUNE position
and the Meter switch to TUNE-OPERATE.
The voltmeter should indicate some output.
Adjust the FINAL TUNE control for mazi-
mum output, which should give a reading of
over S3 on the Transceiver meter, If the
APN Mm
meter goes above 88, adjust the CARRIER
NULL control to drop the level to S89,
Adjust both slugs of transformer T2 for
Mmeayimiim meter indication
a Maximum meter SHULL ALLO,
wit UUuliidiy 10GG, P4aue’e Wit 2 VA 22 OWA A
the PTT position, Allow the Transceiver to warm
fettl uy for at least one-half hour before adiu o
Mp Ee el Ch ded Muy Ut 4445, 2
the balanced modulator,
1,
i)
Press the PTT switch, or ground lug #2 of
the MIC socket with a Shore wire. and adiust
sae wee wh a snort wir Sy att ARS
the aero NULL control for aminimum
indication on the test meter,
signal ati ae. Lele
Using the long end of the alignment tool
adjust the bottom slug of transformer T1
to the bottom of its travel (clockwise from
the top of the chassis).
rt,