B)-I.f. Alignment Adjustments - RCA AR-88.LF Instructions Manual

General purpose communications receiver
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TABLE No. IV (b)
R.F. ALIGNMENT ADJUSTMENTS
Position of
Antenna
Trimmer
indicated.
Max. output
Untouched
over the band.
Range
Oper- Switch
ation Posi-
No.
tion
1
1
2
1
3
Repeat 1 and 2
4
1
5
1
6
Repeat 4 and 5
Dummy
Antenna
74
700 mmf
200
700 mmf
until end frequencies are as
195
700 mmf
80
700 mmf
until circuits remain in alignment
Trimmer Adjust-
ments for Max.
Peak Output
(See Figures
Trimmer
3 and 4)
Function
L-51
Low end osc.
C-16
High end osc.
C-37, C-59
1st & 2nd R-F
L-2, L-14, L-24 Ant. & 1st and
2nd R/F
Po.jtion of Dial,
and Generator
Frequency
7
2
8
2
9
Repeat
10
2
11
2
12
Repeat
200
700 mmf
L-52
545
700 mmf
C-19
7 and 8 until end frequencies are as indicated.
500
700 mmf
Max. output
205
700 mmf
Untouched
10 and 11 until circuits remain in alignment over the band
Low end osc.
High end osc.
1st & 2nd R-F
Ant. & 1st and
2nd R-F.
C-38, C-60
L-4, L-16, L-26
L-53
C-?2
3
3
Repeat
3
3
Repeat
4
4
Repeat
4
4
Repeat
4,250
200 ohms
1,600
200 ohms
16 and 17 until circuits remain in alignment
Low end osc.
High end osc.
Max. output C-41, C-64
1st & 2nd R-F
Untouched
L-6, L-19, L-29 Ant. & 1st and
over the band.
2nd R-F.
13
14
15
16
17
18
19
20
21
22
23
24
1,500
200 ohms
4,350
200 ohms
13 and 14 until end frequencies are as indicated.
4,300
200 ohms
L-54
Low end osc.
12,100
200 ohms
C-25
High end osc.
19 and 20 until end frequencies are as indicated.
11,900
200 ohms
Max. output C-39, C-62
1st & 2nd R-F
4,400
200 ohms
Untouched
L-8, L-18, L-28 Ant. & 1st and
22 and 23 until circuits remain in alignment over the band.
2nd R-F.
*25
12,000
200 ohms
26
19,400
200 ohms
27
25 and 26 until end frequencies are as indicated.
28
19,000
200 ohms
Max. output
29
12,150
200 ohms
Untouched
30
29 until circuits remain in alignment over the band
L-55
Low-end osc.
C-27
High end osc.
C-43, C-66
1st & 2nd R-F
L-10, L-20, L-30 Ant. & 1st and
2nd R-F.
5
5
Repeat
5
5
Repeat 28 and
200 ohms
200 ohms
frequencies are as indicated.
200 ohms
Max. output
200 ohms
Untouched
remain in alignment over the ban
*31
6
19,100
32
6
30,400
33
Repeat 31 and 32 until end
34
6
30,000
35
6
19,500
36
Repeat 34 and 35 until circuits
*NOTE: On all coils, except Nos. 5 and 6 band
oscillator coils (L-55, and L-56) turning
the core clockwise increases the induct-
ance. On the above two mentioned
coils, turning the core clockwise de-
creases the inductance.
C-45, C-68
1st & 2nd R-F
L-12, L-21, L-31 Ant. & 1st and
d.
2nd R-F.
On all bands the oscillator tracks above the sig
nal frequency.
If more than one peak is obtainable on oscillator
use the higher frequency peak.
L-56
Low end osc.
C-32
High end osc.

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