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Operating Instructions
For
Super-Clipper
READ THESE INSTRUCTIONS THROUGH BEFORE TRYING TO OPERATE THIS RECEIVER.
The SUPER - CLIPPER must be used on 110 to 120 volt A.C,
only. After plugging the line cord into your power outlet the receiver
is turned "ON" or "OFF" by means of the switch knob just below the
speaker.
The four calibrated bands on the large main dial
correspond to the four numbered positions on the two band-switches on
the lower left control panel. Number one band is the broadcast band
across the top of the dial; number two band is immediately below it,
etc., the bottom being number four. The pointer of the large dial
should be set on the frequency of the station desired and then the
bandspread dial (center of panel) should be slowly tuned with the left
hand while the regeneration control is adjusted with the right hand.
Regeneration increases as the regeneration control is moved to the
right. If it is carried to the right too far it goes beyond the point
of maximum sensitivity and the detector tube goes into oscillation
causing whistles to be heard whenever a station is tuned in. This
condition can be used as a convenient station finder for weak signals
which otherwise might be passed over.
The signal booster is cut out of the circuit by moving
it's band control switch to the "off" position. When it is in use it's
switch must always be on the same number as the regular bandswitch. The
chief purpose of the signal booster or preamplifier, as it is called,
is to improve the reception on weak foreign short wave stations. On
strong signals and local long wave reception it is best to cut it out
of the circuit.
The TRIMMER control - located between the two
bandswitches - serves two purposes It provides proper antenna impedance
match at different frequencies, giving maximum signal pickup, and it
also acts as a selectivity control, giving sharper tuning as it is
turned to the right. It is a compression type condenser and accordingly
may be turned completely around two or three times over it's entire
adjustment range. Do not try to force it however at it's extreme ranges
where it begins to turn hard.
SUPER - REGENERATION
Inside of the receiver there is a small bakelite sub-panel on
which are mounted three pin-jacks - two red and one black - and another
compression type isolantite condenser. The latter is mounted below the
chassis base with it's slotted shaft, for screw driver adjustment,
extending above. This condenser is used chiefly to adjust the calibration
on the broadcast band. It is properly adjusted at the factory and need
not be touched. If it is desired to tune to frequencies higher than
those indicated on the main tuning dial, super-regeneration and the
special plug-in air-coils must be used as follows: -
Remove the short wire jumper, which is always inserted
between the rid and black pin-jacks for the lower calibrated
frequencies and insert the ends of one of the air-coils in the two red
pin-jacks. Three ultra high frequency air-coils are furnished (others
can be easily wound from #14 or #16 hard drawn copper wire for
experimental purposes). The largest coil includes the amateur and
police bands in thee neighborhood of ten meters; the medium sized coil
covers the seven to eight meter ultra high frequency broadcast and
television bands, while the smallest coil is for the five meter amateur
band.
Turn the preselector switch to the "OFF" position and
place the band switch on the "SUPER REGEN* position. The main tuning
dial should be turned to the high frequency end of the scale (where the
plates are out of mesh) and left there as it is not used for
super-regenerative tuning. Retard the volume control until a loud hiss
is heard. The detector is now super regenerating and stations can be
tuned in with the bandspread condenser which now does all the tuning.
ANTENNA CONNECTIONS
Two antenra4onnection positions are provided on the back of the
chassis. The one on the right (looking at the set from the rear) is for
any standard aerial although we do NOT recommend special doublets for
all-wave reception. We advise a plain single wire L type antenna; from
50 to 150 feet in length and as high as possible. The left hand antenna
connection is for ultra high super-regenerative reception so that
separate special antennas may be used for these short waves below ten
meters. However, the regular antenna may be connected here for this
high frequency work, if desired, with reasonably good results.
The "GROUND"' post (marked G) need not be connected at all if a
straight antenna is used. It is well however to try a ground connection
as, under some conditions, it improves reception - particularly on #1
band.
BANDSPREAD ADJUSTMENT
The bandspread condenser, which is controlled by the center
dial, may be adjusted to give any degree of bandspread desired by
simply bending the fixed and moveable plates further apart. The greater
their separation the greater the bandspread will be. The present
adjustment is correct for average reception but for special amateur
phone or CW reception greater bandspread is desirable.
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