TB 11-6625 -3263-25
Items Potentially Replaceable
Designator
LIN
NSN
Condition Code
8640B
NONE
NONE
E53
SG-1207/U
S41715
E54
SG-1093/U
J54125
E51
SG-1112(V)1/U
S48051
E52
SG-1112(V)2/U
S48119
E53
Condition Codes
Code
Condition
E51
This item is an HP 8640 which has a built in frequency counter from 20 Hz
to 550 MHz. The TEMOD item does not have this capability. Replace with
TEMOD item if counter is not required.
E52
This item is an HP 8640B w/opt 004 which is the avionics option. It also
has a built in frequency counter. The TEMOD item has neither of these
capabilities. If neither capability is required, replace with TEMOD item.
E53
This item is an HP 8640B w/opt 001 which has an internal frequency
counter. The TEMOD does not have frequency counting capabilities.
Replace with TEMOD item if frequency counter is not required.
E54
This item is a HP8642M which has a noise floor at -140 dBc/Hz at 3 MHz
offset. Replace with TEMOD item if the noise floor is not required below
-120 dBc/Hz at 3 MHz offset.
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