The Special Fish Report
Albert W. Small (December 1944)
Page 68
Tony Sale's
Codes and Ciphers
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CX/MSS
TOP SECRET Special Fish Report Page 68
and therefore:
P(0 cross in the delta psi prime sum) = A0^2 + 4A1^2 + 6A2^2
+ 4A3^2 + A4^2 = .133
1/4 *P(1 in the sum) = 2(A0A1 + 3A1A2 + 3A2A3 + A3A4) = .051
1/6 *P(2 in the sum) = .050
1/4 *P(3 in the sum) = .064
P(4 in the sum) = .105
(All the above is also based on a motor dottage or 20.) Assuming the sum
of (Delta-D)A plus (Delta-D)B to be random if the two are wrongly overlapped:
(Delta-D)A + (Delta-D)B Decibans in favor
or(DeltaPSI)A + (DeltaPSI)B of correct setting
of go-back
Given (out of 4 impulses
only):
L0 3.3
L1 -0.8
L2 -0.9
L3 0.1
L4 2.3
It is also possible to make up tables taking into account the
limitation. Thus:
(Assuming limitation P(0 crosses in DeltaPSI1) = 1-a' + a'(l-b)^5 = .542 = B0
= x and M37
has 20 dots): 1/5 *P1 = .003 = B1
1/10*P2 = .007 = B2
1/10*P3 = .015 = B3
1/5 *P4 = .032 = B4
P5 = .069 = B5
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