Hallicrafters Skyrider SX-32 Operating, And Servicing Instructions page 2

which might have occurred in transit. Should any sign
of damage be apparent immediately file claim with the
cafrier stating the extent of the damage.
Important: Unless otherwise marked, this receiver is to
be operated from 110-125 volts of 50/60 cycle alternating
current, A universal 110-220 volt model is obtainable on
order. This model can be operated at cither of those two
voltages with 25/60 cycle curfent. If the voltages are
higher than indicated an external stepdown transformer
must be used. A switch, mounted on the top of the uni-
versal transformer case, will allow convenient 110-220
voltage change.
The standard model SX-32 receiver comes equipped
with a cabinet for table mounting. The standard 834" x
19" panel dimension with holes suitably spaced make it
possible for the chassis to be mounted in a standard relay
rack. Maximum overall chassis length is 1734" and depth
1374". When the model SX-32 is so mounted the tabic
cabinet
over-all length of the receiver will then allow it to be
mounted ina rack with upright channel clearance of 1714".
] meh . (1, Tha 4 tee
is replaced with al giist cover. int aximuini
TERMINALS AND CONNECTIONS ON
REAR OF RECEIVER
SPEAKER
+ of the receiver's chas
Nh Un BUE clit 100i vei & Ua
terminal strips for r connecting either a 500 or 5000 ohm
speaker to the receiver. Should a matching HALLI-
CRAFTERS Bass-Reflex speaker be used with the re-
ceiver, it should be connected to the 5000 ohm terminals.
The §00 ohm terminals can be connected to a speaker or
other load of that impedance value.
ANTENNA
To the terminals marked Al-A2 and G should be con-
nected the antenna you have chosen to use with the
model SX-32 receiver.
Very satisfactory results throughout the tuning range
of the SX-32 will be obtained with a conventional in-
verted "'L'' Marconi type of antenna 75 to 100 feet long
including lead-i "in. This antenna should be erected as high
as pussibic and removed from surrounding objects. Be
sure that the antenna is insulated from the ground at all
points. When this type of antenna is used it is connected
to terminal A-1. The Jumper between A-2 and G should
remain connected.
In the event a doublet antenna is used with the model
SX-32 SKYRIDER receiver, the two wires of the doublet
lead-in should be connected to terminals Al and A2. The
Jumper berween AZ and G can remain connected Or rc-
moved, depending upon its effect on favorable reception.
Deo the re;
L
A ground can be used if desired and should be con-
nected to the G terminal. Connecting the receiver to a
good ground ( (cold water pipe or 6 foot rod driven in
moist soil) might improve reception and reduce noise.
Under normal conditions no noticeable difference will
exist $0 a4 ground is suggesicd only if i it aids reception.
prove very effective. The following formula will give the
t
length of the 44 wavelength antenna depending on the
desired frequency.
463
desired frequenc
Length in feet = :
frequency in megacycles.
or, for example, a half wave 40 meter antenna would
be" = 66.14 feet long.
The antenna should preferably be of solid soft drawn
enameled copper wire for case in handling. The center of
the wire is cut and an insulator inserted at that point.
The twisted pair, or open wire transmission line, is then
soldered to each 33 foot length, after the enamel has
been scraped off, directly on either side of this center
insulator. The other end of the transmission line should
be connected to Al and A2 on the receiver. It should be
remembered that such an antenna has directional prop-
erties broadside to its » length and should be so oriented
if maximum
expected.
In designing transmission line systems for a more accu-
rate match of the Itne to the antenna input circuit, it
will be helpful to know that the approximate antenna
input impedance of the receiver is 400 ohms.
STAND-BY SOCKET
The Send-Receive switch on the front panel makes the
receiver inoperative by removing the plate voltage from
the tubes when the switch i is in the SEND position. Con-
the fupes HOT) Lie a0Oii is if) Lise OfL MEARE, NAATER
nected in parallel with this switch is the standard 110
volt receptacle on the rear chassis edge. Should you wish
to inake the recciver inoperative by using a remote relay
or switch, connect the contacts of the relay to a standard
plug, insert it in the STAND-BY switch socket and the
external relay or switch will close and open the circuit
so long as the SEND-RECEIVE switch on the front panel
is in the SEND position.
PHONO-JACK
The Phono-Jack enables you to use the high fidelity
audio amplifier of the receiver for phonograph record or
transcription play-back purposes. A high impedance crys-
tal or magnetic pick-up arm should be used for this pur-
pose and | connected to a standard headphone plug. This
plug is then idserted in the PHONO-JACK when record
playing is desired. The receiver is inoperative to radio
signals, when the plug is in the phono-jack.
The volume of the audio amplifier is varied | by rotating
the AF Gain control until the proper level is obtained.
Removal of the plug from the Phono-Jack once more
places the RF and IF portions of the receiver in operation.
pickup from al certain direction iS to be
6 VY JOLT DC, SOCKET
v WINNER A
The DC Operation Socket can be used when it is neces-
sary co furnish power to rhe receiver from a direct current
source. For conventional AC operation, the shorting plug
must remain in the DC Operation. Socket. This plug
should be remov red for battery or vibrapack operation.