Heathkit GR-78 - Page 27

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cone-alf ofthe battery. On the other halt eye, he voltage
| anpllad through code D802 to charge the other half of
the battery,
Th buttery can ako be charged from 12 0 18 VOC, Wan
‘the DC power cord is connectad to 8 power source, the DC
voltage Is applied through diode D503, plot lamp PL-£03
and rasstor ROB to the battery. The diode protects the
bartery from being charged in case the external OC
‘hurging voltage fe connected beekwards, The pilot lamp
lieon through the small lela the rear panel) and reitor
function primarily a& « OC charging curentJimiter, The
lamp may not races be
Charging From an AC Powar Source
Plug the AC power cord into a 120 VAG oF 240 VAC power
outlet deporting how the Receiver was wire. The battery
Wil charge automatically as 1ong as the power cord
‘lugged
in
and
the
Receiver
is
turned
oft
the
battery
was
completely sun down (aproximtely 8.0 vot), this procs
‘uket about 38 hour. If It was not completely run down,
spproximately
1-1/2
houre
of
charging
fr
each
hour
the
batary ws used since the last charge wil restore the battery
1 ull charge. However the buttery should be recharged
‘ceasonally for 2 period of 24 hours to insure that al the
Call of the batery reach full charge. The battery can be
‘ricklechargd for several days without being harmed A full
charge ean be accompliahed only H the Recaver is turned
ot
Charging From a DC Power Source
CAUTION: If the Receiver Is connected to 4 12 0 18 VOC
POSITIVE GROUND. power source, the Receiver chasis
‘must not Touch the chasis or ground side of the power
Connect the DC power cord to a 12 10 15 VOC power
source. When the front panel reitch is OFF the battery will
chore automatically at the given rate long et the power
ord is connacted to the power source. Depending on the
1p of power source: uch a a storage battery, OF» ear or
oat generator; the charging voltage can vary from ¥2 VOC
Ho 15 VOC. If the battery wax completely run down
(vporoxinately 0.0 vols, this proces takes trom 30 houre
for 2 135 VDC power source to 20 hours for # 15 VOC
that al the cals of the battry coach ful charge. The battery
‘can be trickle charged for 20 days without being harmed.
The front poral switch must be OFF to accomplish a full
charge in the above given tines
VOLTAGE CHARGING
RATE
ravoc 15a
135 voc 25mA
we voc 386 mA
ANTENNA INSTALLATION
‘An external antenna and a ground system are necesary for
‘od
longwave
reception
on
Band
A
and
good
shortwave
reception on Bands C, D, E, and F. The antenne wil a0
(gastly
improve
reception
on
Bands
B
and
C,
the
standard
brondeast bands.
‘The following information includes tree types of antennas
longwire,
dipole,
und
invertad:V
dipole.
Read
the
information concerning each antenaa and than follow the
Insalation instructions forthe one that best wits your
ow, The Heat Model GRA-72 SWL Recdving Antenna
would make an adequate longowire, dipole, or Invert:
tenn.
Antenna Types
ipoleThi it directions antenna deigned for shortwave
reception, The ditional feature moans that signi are
received best when the antenna is turned broadside to the
‘vanamitting station when the ands of the antenna do not
point toward the transmitting sation.
Inverted. V Dipole—Thisis2 nondiretinal antenna designed
for shortwave reception. The nondiectiona feature meant
‘that thie antenne wll rectve signals squely well from al
directions. Therefor, it is oft possible to receive more
stations with this antenne than you would with the straight
‘pole antenna.