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R-392 Mixer, IF, and Xtal Frequencies

The R-392 receiver covers 0.5 to 32 megacycles in 32 bands of one megacycle. One the eight lower bands it operates as a triple conversion superhetrodyne with the first variable intermediate frequencies (VIF) in range of 9 to 18 mc. The second VIF is 2 to 3 mc and the fixed IF is 455 kc.

The following table shows the mixer frequencies and IF frequencies for each band position. This information comes from Chart b in paragraph 107 Rf and Variable If. Conversion Scheme.

Note that the first band mechanically covers 0 to 1 mc, but that the input circuits only tune 0.5 to 1 mc.

Band
(mc)
1st Xtal
(mc)
1st VIF
(mc)
2nd Xtal
(mc)
2nd VIF
(mc)
VFO
(mc)
Fixed IF
(kc)
0.5 - 1 9 9.5 - 10 12 2.5 - 2 2.955 - 2.455 455
1 - 2 8 9 - 10 12 3 - 2 3.455 - 2.455 455
2 - 3 10 12 - 13 15 3 - 2 3.455 - 2.455 455
3 - 4 12.6 15.6 - 16.6 18.6
(3x6.2)
3 - 2 3.455 - 2.455 455
4 - 5 7 11 - 12 14 3 - 2 3.455 - 2.455 455
5 - 6 8 13 - 14 16
(2x8)
3 - 2 3.455 - 2.455 455
6 - 7 9 15 - 16 18
(2x9)
3 - 2 3.455 - 2.455 455
7 - 8 10 17 - 18 20
(2x10)
3 - 2 3.455 - 2.455 455
8 - 9

11 3 - 2 3.455 - 2.455 455
9 - 10

12 3 - 2 3.455 - 2.455 455
10 - 11

13 3 - 2 3.455 - 2.455 455
11 - 12

14 3 - 2 3.455 - 2.455 455
12 - 13

15 3 - 2 3.455 - 2.455 455
13 - 14

16 3 - 2 3.455 - 2.455 455
14 - 15

17
(2x8.5)
3 - 2 3.455 - 2.455 455
15 - 16

18
(2x9)
3 - 2 3.455 - 2.455 455
16 - 17

19
(2x9.5)
3 - 2 3.455 - 2.455 455
17 - 18

20
(2x10)
3 - 2 3.455 - 2.455 455
18 - 19

21
(2x10.5)
3 - 2 3.455 - 2.455 455
19 - 20

22
(2x11)
3 - 2 3.455 - 2.455 455
20 - 21

23
(2x11.5)
3 - 2 3.455 - 2.455 455
21 - 22

24
(2x12)
3 - 2 3.455 - 2.455 455
22 - 23

25
(2x12.5)
3 - 2 3.455 - 2.455 455
23 - 24

26
(2x13)
3 - 2 3.455 - 2.455 455
24 - 25

27
(3x9)
3 - 2 3.455 - 2.455 455
25 - 26

28
(2x14)
3 - 2 3.455 - 2.455 455
26 - 27

29
(3x9.666)
3 - 2 3.455 - 2.455 455
27 - 28

30
(3x10)
3 - 2 3.455 - 2.455 455
28 - 29

31
(3x10.333)
3 - 2 3.455 - 2.455 455
29 - 30

32
(3x10.666)
3 - 2 3.455 - 2.455 455
30 - 31

33
(3x11)
3 - 2 3.455 - 2.455 455
31 - 32

34
(3x11.333)
3 - 2 3.455 - 2.455 455
Band
(mc)
1st Xtal
(mc)
1st VIF
(mc)
2nd Xtal
(mc)
2nd VIF
(mc)
VFO
(mc)
Fixed IF
(kc)
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