TECHNICAL MANUAL
OPERATOR’S, ORGANIZATIONAL, AND
DIRECT SUPPORT MAINTENANCE MANUAL
FOR
ANTENNA GROUP
OE-254/GRC
(NSN 5985-01-063-1574)
This publication is required for official use or for
administrative or operational purposes only. Distribution
is limited to US Government Agencies. Other request for
this document must be referred to Commander, US Army
The OE-254/GRC is a biconical antenna that uses a Balun (BALanced to UNbalanced transformer) to match the 50 Ohm coax line and radio to the 200 Ohm antenna. It covers the 30 to 88 MHz frequency range without any element adjustments and therefore is said to have an instantaneous bandwidth.
The RC-292 antenna needs to have three different element lengths to cover the 30 to 88 MHz frequency range and therefore is not suitable for use with frequency hopping radios.
The OE-254 was designed for frequency hopping and conventional radios. You also do not need to be lowering and rasing the antenna to work anywhere in the 30 to 88 MHz band.
I suspect that this bi-conical has a much wider bandwidth than the specification, just as a diskcone has a wide bandwidth.
Note that the AS-1729 and AS-3900 VHF Low band vehicular antennas have about MINUS 6 dB gain relative to a dipole. These would not be suitable for use with the squad radios 1 Watt output power.
Antenna elevation is very important in this frequency band. Placing the OE-254 on all the mast sections makes a huge difference in it's coverage area. There are some web references to a new wide band antenna that's compact and light weight and is deployed on the ground, i.e. it does not use a mast. This no matter how well matched this antenna is, it never will have the coverage of the OE-254 up on a mast.
These antennas don't seem to be current as of 2008. The Harris RF-9072 Low-Band VHF Discone Antenna may be a replacement.
The Create Discone may also be a replacement.
TECHNICAL MANUAL
OPERATOR’S, ORGANIZATIONAL, AND
DIRECT SUPPORT MAINTENANCE MANUAL
FOR
ANTENNA GROUP
OE-254/GRC
(NSN 5985-01-063-1574)
This publication is required for official use or for
administrative or operational purposes only. Distribution
is limited to US Government Agencies. Other request for
this document must be referred to Commander, US Army
The OE-254/GRC is a biconical antenna that uses a Balun (BALanced to UNbalanced transformer) to match the 50 Ohm coax line and radio to the 200 Ohm antenna. It covers the 30 to 88 MHz frequency range without any element adjustments and therefore is said to have an instantaneous bandwidth.
The RC-292 antenna needs to have three different element lengths to cover the 30 to 88 MHz frequency range and therefore is not suitable for use with frequency hopping radios.
The OE-254 was designed for frequency hopping and conventional radios. You also do not need to be lowering and rasing the antenna to work anywhere in the 30 to 88 MHz band.
I suspect that this bi-conical has a much wider bandwidth than the specification, just as a diskcone has a wide bandwidth.
Note that the AS-1729 and AS-3900 VHF Low band vehicular antennas have about MINUS 6 dB gain relative to a dipole. These would not be suitable for use with the squad radios 1 Watt output power.
Antenna elevation is very important in this frequency band. Placing the OE-254 on all the mast sections makes a huge difference in it's coverage area. There are some web references to a new wide band antenna that's compact and light weight and is deployed on the ground, i.e. it does not use a mast. This no matter how well matched this antenna is, it never will have the coverage of the OE-254 up on a mast.
These antennas don't seem to be current as of 2008. The Harris RF-9072 Low-Band VHF Discone Antenna may be a replacement.
The Create Discone may also be a replacement.
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