RCA SSB-1, Instruction Book

Page: 25 / 79

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APPROXIMATE SLUG POSITION OF
RECEIVER RF COILS (Cont'd)
Frequency
Number of Turns
Serial Nos. 5501-55250 5601 and above
C HANNELS 3 or 4
6700Kc 38
29
8000Kc
21 25
9500Kc 25
22
11000Kc
21 19
13000Kc 15 15
15000Kc
10 12
Thus, at 14,250 kc carrier, the number
of turns would be 11.
b. Adjust REC. 1st MIXER GRID COIL 1
(L-221) from a fully counterclockwise posi­
tion. Turn the slug the number of turns
required to tune to the desired frequency
of channel 1, as indicated below or as shown
in figure 27.
APPROXIMATE SLUG POSITION OF
RECEIVER MIXER GRID COILS
Frequency
Number of Turns
Serial Nos. 5501-55250 5601 and above
3000Kc
4000Kc
5000Kc
6000Kc
6700Kc
6700Kc
8000Kc
9500Kc
11000Kc
13000Kc
15000Kc
CHANNELS l or 2
40
26
18
13
11
CHANNELS 3 or 4
41
32
26
22
17
12
30
23-1/2
19
15
12-1/2
30
25
21-1/2
19
15-1/2
12
Thus at 14,250 kc carrier, the slug posi­
tion would be 14.5 turns from minimum in­
ductance.
21
c. Turn on the POWER and RECEIVER
switches; set CHANNEL selector to 1,
SPEAKER-HANDSET switch to SPEAKER
and TELEGRAPH-PHONE switch to- PHONE;
and turn the RECEIVER GAIN control fully
clockwise.
d. Adjust the REC RF GRID COIL 1
(L-217) for maximum noise response of the
SSB-1 speaker.
e. Adjust the REC. 1st MIXER GRID COIL
1 (L-221) for maximum noise response of
the speaker.
!_.
Align the receiver for channels 2 , 3
and 4 by using the respective circuit tuning
elements for each channel and following the
procedures of steps
�
through
�
above.
10. T E L E P R I N T E R C
0
N N E C­
T I
0
N S.
When external teleprinter and tone con­
verter equipment is to be used, connect this
equipment to terminal board TB104 on the
rear apron of the SSB-1 power supply chas­
sis as shown in figure 28. With this con­
nection, the tone oscillator in the SSB -1 is
keyed externally and the added switch op­
erates the internal antenna transfer relay to
switch between receiver and transmitter
operation.
11. O P E R A T I O N A L C H E C K S.
Using the operational procedures of Sec­
tion IV, check that the equipment is operat­
ing properly on each channel.
Establish
contact with another station of the network.
During ·reception, and with the SPEECH
CLARIFIER control centered, adjust the
respective CHANNEL FREQ. OSC. TRIM­
MERS 1, 2, 3, and 4 (C-251, C-250, C-2 49
and C-248, respectively,) for clearest re­
ception. This procedure also adjusts the
transmitted signal for clearest reception at
the distant station.