Heathkit HR-10B - Ssb Operation; In Case of Difficulty

Page 34
(
Rotate the MAIN tuning capacitor until a
CW station is located.
( Adjust the BFO TUNE control for the most
comfortable listening tone.
( )
It is usually best to adjust the listening
level using the RF GAIN control. This pro-
vides maximum RF amplification for a weak
signal.
SSB OPERATION
For SSB reception, set the controls as ex-
plained for CW operation, except turn the AVC
switch to AVC and adjust tne BFO TUNE con-
trol as follows: The BFO TUNE control will
normally be set at 10 o'clock for upper SSB
stations and 2 o'clock for lower SSB stations.
Upper sideband transmission is usually used
on the 10, 15, and 20 meter bands. Lower side
band transmission is usually found on 40 and 80
meters. Should you find it impossible to tune in
a SSB station, reverse the BFO TUNE control
setting, as this station may be transmitting on
the other sideband.
As with CW reception the listening level should
be
adjusted with the RF GAIN control, with the
AF GAIN control in the 3 o'clock position.
ANTENNA
The Receiver will operate using a long wire
attached to the antenna connector, however,
for the best results the antenna should have an '
impedance of 50 to 7 5 n. This could be a dipole
type antenna. The dipole should
be constructed
for the band that you desire to receive. Natur-
ally, if this Receiver is to be used in conjunction
with a
transmitter, the transmitting antenna
should also be used for reception. For this
type of operation, a method for switching the
antenna from the transmitter to the ReceivElr
must be used.
If you wish to construct a dipole type of antenna,
we
suggest that you refer to the ARRLHandbook,
an Antenna Handbook,
or one of the periodical
amateur radio magazines. These references are
available at most Radio- TV Distributors.
IN CASE OF DIFFICULTY
1. Recheck the w1rmg. Trace each lead in
colored . pencil on the Pictorial as it is
checked. It is frequently helpful to have a
friend check your work. Someone who is not
familiar with the unit may notice something
consistently overlooked by the constructor.
2. It is interesting to note that about 90% ofthe
kits that are returned for repair, do not
function properly due to poor connections
and soldering. Therefore, many troubles
can be eliminated by reheating all connec-
tions to make sure that they are soldered
as described in the Proper Soldering Tech-
niques section of this manual.
3. Check to be sure that all tubes are in their
proper locations. Make sure that all tubes
light up properly.
4. Check the tubes with a tube tester or by
substitution of tubes of the same types
and known to be good.
--- - - - --- -- -
5. Check the values of the parts. Be sure
that the proper part has been wired into
the circuit, as shown in the pictorial
diagrams and as called out in the wiring
· instructions.
6. Check for bit$ of solder, wire ends or other
foreign matter which may be lodged in the
wiring.
7. If, after careful checks, the trouble is still
not located and a voltmeter is available,
check voltage readings against those shown
on
the Schematic Diagram. NOTE: All
voltage
readings were taken with an 11
megohm input vacuum tube voltmeter. Volt-
ages may vary as much as 10%.
8. A review of the Circuit Description will
prove helpful in indicating where to look
for trouble.
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