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 MIL-HDBK-1012/l
Table 1 (Continued)
Separations and Clearances
SOURCE OF INTERFERENCE1
`MINIMUM
DISTANCE
FACILITY
Elevated horizontal conductors4
Must not subtend a
Direction finder
vertical angle
exceeding
at
base of DF antenna
Wullenweber type)
1/4 mi (0.4 km)
Railroads
from antenna
No effect
Rivers and streams
Radio transmitter stations:
10 mi (16 km)
Major
1 mi (1.6 km)
Minor or emergency
1,500 ft (457 m) from DF site
Housing areas
Less than 3uV/meter
Ambient interference
throughout desired frequency
range
Communication center should conform
centers and
to the minimum separations from
terminal equipment Receiver Station as given above
---
building
Max distance 300 ft (91 m)
Separation between RF building and antennas
Control link
facilities
Separation between RF building and
Max distance
operations building
1,500 ft (457 m)
'Tabulated sources interference apply to DF stations of any frequency. For
additional sources applicable to specific frequencies refer to Handbook of
Naval Shore Station Electronics Criteria, NAVELEX 0101, Appendix VIII.
2
Maximum distance between transmitter and receiver stations is only limited by
microwave path and logistics. For the majority of applications this
distance should be limited to 30 miles (48 km).
3
The following NAVELEX requirements also govern distances to non-Navy
transmitter stations:
a) Signal from non-Navy station shall not exceed 10 microvolts per meter
(field intensity) at the Navy site boundary.
exceed 5 microvolts per meter (field intensity) at the Navy site
boundary.
4
If conducting towers are used, or if the horizontal conductor is a receiving
antenna, refer to NAVELEX 0101, Appendix VIII.
5
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