Hallicrafters S19-R User manual

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OPERATING
ALIGNMENT & SERVICING
INSTRUCTIONS FOR
SKY BUDDY RECEIVER
MODEL S-I9R
the liallicraft ers inc.
2611 INDIANA AVENUE
CHICAGO
01253919R

OPERATING INSTRUCTIONS
Sky Buddy Model S19- R
The model S19- R Sky Buddy is a 6 tube 4 band superheterodyne receiver covering
the following frequencies:
Band 1 - 540 KC to 1700 KC
2 - 1.7 MC to 5.5 MC
3 - 5.5 MC to 17.0 MC
4 - 16.0 MC to 46.0 MC
ANTENNA
For successful operation of the receiver throughout its tuning range very sat-
isfactory results can be obtained with an inverted " L" type antenna 75 feet
long overall. When this type of antenna is used the jumper should remain con-
nected between A2 and G.
If the operator should wish to obtain the maximum in performance from the re-
ceiver on any one frequency, it is suggested that a half wave doublet antenna
cut for that frequency be installed.
The formula for calculating the overall length of this antenna is:
Length in feet =
Frequency in megacycles
463
The antenna is cut in the center and connected to a twisted pair transmission
line having a characteristic impedance of 75 ohms. The other end of this line
is connected to the Al and A2 antenna posts.
This antenna will not perform well at harmonic frequencies but should be bet-
ter than the inverted " L" on the frequency for which it has been designed.
Performance on the + 4 band, even with a suitable antenna, is subject to vary-
ing conditions of the time of the day and year.
A ground is usually not necessary for satisfactory performance of the model
S19- R Sky Buddy receiver. If a ground does prove helpful it is connected to
the " G" post of the antenna terminal strip. A cold water pipe or a 6 foot
rod driven into moist soil are good ground suggestions. Connections to rad-
iators and gas piping are not advised.
CONTROLS AND OPERATION
The model S19- R Sky Buddy is equipped with conveniently arranged controls to
enable the operator to realize the maximum in performance from the receiver.
MAIN TUNING
This control rotates the large calibrated dial so that the desired frequency
can be easily located. The accuracy of calibration is held to close toler-
ances. This calibration will be correct, however, only if the " Bandspread'
dial is set at " 0" or minimum capacity.

GUARANTEE
This receiver is guaranteed to be free from any defect in
workmanship and material that may develop within a period
of ninety ( 90) days from date of purchase, under the terms
of the standard guarantee, as designated by the Radio
Manufacturers Association. Any part or parts that prove
defective within this period will be replaced without charge
when subjected to examination at our factory, providing
such defect, in our opinion, is due to faulty material or
workmanship, and not caused by tampering, abuse or normal
wear. All such adjustments to be made FOB the factory.
Should this receiver require any adjustments, your dealer
or distributor has complete technical service information,
or the factory will be glad to assist you in any problem
direct.
Should it be necessary to return any part or parts to the
factory, a " Return Material Permit" must be obtained in
advance by first writing the Adjustment Department, who
will issue due authorization under the terms of the guar—
antee.
The Hallicrafters, Inc., reserve the right to make changes
in design or add improvements to instruments manufactured
by them, without incurring any obligation to install the
same in any instrument previously purchased.
All Hallicrafters receivers are built under patents of
Radio Corporation of America and Hazeltine Corporation.

00

"BANDSPREAD"
In no other similar receiver but the S19- R Sky Buddy can be found such ex-
tremely smooth and satisfactory electrical bandspread action. The stator
plates are an integral part of the main condenser and the separate rotor sec-
tions are driven by a gearless mechanism through the separate bandspread knob.
The controls along the bottom edge of the receiver are:
SEND- RECEIVE SWITCH which, when in the " send" position, removes plate voltage
from the tubes.
The BAND SWITCH allows selection of any one of the four ranges covered by the
receiver. The newly incorporated 10 meter band will prove to be most inter-
esting when conditions are favorable for reception on that range.
The B.F.0."0N-OFF" SWITCH allows optional use of the Beat Frequency Oscillator
and is used when the operator is copying code signals. It will be of addi-
tional help in locating weak fone signals by first locating their carrier.
Once located, the B.F.O. may then be turned off to eliminate the whistle.
The PITCH- CONTROL Knob allows the operator to vary the pitch of the beat note-
when the BFO switch is in the " on" position. Selection of the pitch of the
beat note most pleasing to the operator will be of help in copying through
interference. The A.V.C. " OFF" and " ON" Switch is for optional use of auto-
matic volume control. Should the strength of the telephone signal be so
strong as to block the receiver the A.V.C. switch should be " on". For maximum
sensitivity leave the AVC switch " off" and manually adjust the gain of the re-
ceiver with the audio gain control.
The receiver is turned on and off with this control and additionally provides
variation of the volume delivered by the receiver to suit the requirements of
the listener.
A Headphone Jack is mounted on the panel to the right of the Pitch Control
Knob. When headphones are used, inserting the phone plug in the jack automat-
ically disconnects the speaker.
The tube lineup of the S19- R Sky Buddy is as follows:
6K8G 1st Detector - mixer
6K7G IF Amplifier
6Q7G 2nd Detector - 1st stage of audio
41 2nd Audio Amplifier
76 BFO
80 Rectifier
The Sky Buddy, model S19- R draws 50 watts at 117 volts, 60 cycles A.C.
The Hallicrafters, Inc., reserve the right to make changes in design or to add
improvements to instruments of their manufacture without incurring any obliga-
tion to install the same in any instrument previously purchased.

ALIGNMENT PROCEDURE FOR SKY BUDDY MODEL S19- R
I. F. ALIGNMENT
Have the controls set as follows:
Audio gain control at maximum
A.V.C. switch " on".
Range switch on Band e.
Set main dial to minimum capacity 5.5 M.C. position
Remove 6K8 grid cap and connect signal generator to this tube.
Set signal generator for 455 KC output.
Adjust trimmers on transformers Tl, T2 for maximum output.
For adjustment of the B.F.O., place the BFO switch in the " on" position. Re-
move the knob from the pitch control shaft. You will see a small adjustment
screw in the center of this shaft. On the under- chassis side of this shaft
you will see a set screw which should be loosened in order to allow adjustment
of the screw in the center of the pitch control shaft. Adjust to zero beat.
Tighten the set screw and replace the knob. Should the BFO still fail to op-
erate check the . 0005 condenser in the BFO circuit, or the 76 BFO tube.
R. F. ALIGNMENT
Connect the generator to the Al terminal on the antenna terminal strip found
on the rear apron of the chassis through a 400 ohm resistor. Leave the jumper
connected between A2 and G. The trim and pad points for the 4 bands are in-
dicated below:
Set the signal generator to the required frequencies for each band, adjust the
main tuning dial to those frequencies ( with the bandspread condenser at mini-
mum capacity) and then adjust the indicated trimmers and padders to resonance.
Trim Band j.Pad
idia)Kc
Adjust CA CE
4 MC
Adjust CB C
Adlu iv si Cc
30 MC
Adjust CD CH
Band 2
Band 3
Band 4
600 KC
Adjust C 24
2 MC
Adjust C 25
None- check at 7 MC
None- check at iB MC
On the two high frequency bands where no padding adjustments are found, the
checking frequencies should fall within 1 division of the dial calibration
with no further adjustments.
During the R.F. alignment process it is advisable to " Rock" the main tuning
condenser across the frequency on which you are making adjuslduents to the re-
ceiver. Once the exact point of maximum output is obtained further adjustment
is unnecessary.

G
1 I 1
T2
455 KC
r-LT 1
C24 C25
® ®
TI
455 KC.
C2
Cl
C6K8 G
OSC.
-r-
MIXER
JI
T4
O
SKY BUDDY
MODEL S-I9R
A.C. CORD
„
A1 A2 G
C2 4 C 25 CH
® ® CI 4
OSCILLATOR
® ® ®
I 3 2 - BANDS
CE CG CF
MIXER
BANDS
CA
CB 0 2
CC 0 3
CD I C) 4

SI9R CONDENSER PARTS LIST SI9R RESISTOR PARTS LIST
NO. CAPACITY TYPE VOLTAGE
Cj. . 000375 mfd.
2 Maintaining
3 . 05 200
4 . 01 400
5 . 05 200
6 . 05 200
710 300
8 . 05 200
9 . 0001 Mica
10 . 0001 II II
11 . 02 200
12 . 1 200
13 . 02 200
14 10 25
15 . 01 600
16 . 1 400
17 . 01 " 400
18 . 0001 .. Mica
19 . 0005 ..
20 10 300
21 10 350
22 . 01 600
23 . 0001 Ceramic
24 . 000375 Pad
25 . 001 ..
26 . 0043 .,
27 . 0001 .4 Mica
28 . 01 .. 600
NO. OHMS WATTAGE
Ri 300 1/3
2 50000
3 i0000 1.
4 500 1/3
5 3500 II
6 25000 1
7 50000 1/3
8 300
9 1000000 Variable
10 500000 i/3
11 250000 u
12 1000000 II
13 600 1/2
14 50000 1/3
is 50000 ..
16 3000 1/2
17 10000 1/2
SWITCHES
SW
i A.V.C. on — off
2 Send — Receive
3 BFO on — off

SCHEMATIC DIAGRAM- SKY BUDDY- MODEL S-I9R
6K8
6K7G
6Q7 41
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