TM 11-5820-890-10-3
OPERATIONAL NOTES
PREFERRED ANTENNA CONFIGURATION
The recommended antenna configuration for a retransmit station is two OE254 antennas. OE254 antennas should be fully
extended and separated to their maximum distances (based on site constraints). Under no circumstances should the
OE254 antennas be positioned less than 75 feet apart. (However, if more than one retransmit station is located within a
confined area, a special antenna configuration may be required.)
ALTERNATE ANTENNA CONFIGURATION
Never use two vehicular antennas for FH retransmit. However, two vehicular antennas may be used for SC retransmit.
A vehicular antenna may be used with an OE-254 antenna (fully extended) provided the OE-254 antenna is used for the
retransmit link which is the longest.
When using a vehicular antenna with an OE-254 antenna, it Is important to note that the preferred distance between
antennas is 50 feet. The minimum antenna separation (base to base) is 15 feet.
SITE SELECTION
The retransmit station must be located on top of a hill (or highest point).
Both outstations must be within the retransmit station’s lineofsight (LOS). LOS is defined as a clear path (no barriers such
as mountains, tall buildings, etc.) between the retransmit station and the outstations (Refer to the illustration on page 420).
OPERATIONAL REMINDERS
Refer to the SOI for authorized hopset(s).
Make sure RF switch is set to the lowest possible setting for good communication.
F1 represents the frequency (hopset) between radios A and C. F2 represents the frequency (hopset) between radios B
and D.
Radio link A and C should have a different hopset than radio link B and D during FH retransmit. However, if only one
hopset is available, it may be used for both links provided the net ID’s are different, antenna configuration notes are
followed, and each radio sets RF switch to lowest possible setting for good communication.
A KY-57 is not needed to retransmit secure signals, but it is needed for monitoring.
Cue and ERF signals will not pass through a retransmit station.
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