H Series Antenna Couplers

The couplers are designed to electronically split the received signals equally between the systems. In this manner, a single antenna may feed redundant systems or serve a dual-function role (e.g., glide slope and VHF Omnidirectional Radio Range Localizer [VOR/LOC]).

The ruggedly built couplers are housed in aluminum cases with all circuit elements fully encapsulated. General specifications applicable to all couplers are provided in this sheet, while Table 1 indicates the recommended function of the particular type.

H Series Antenna Specifications

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Electrical
Frequency range	329 – 335.3 MHz 108 – 118 MHz 74.75 – 75.25 MHz (H21-1 only)
VSWR
VOR/LOC	< 1.5:1 dB
Glide slope	< 1.5:1 dB
Marker beacon	< 2.0:1 dB (H21-1 only)
Impedance	50 ohms
Isolation
VOR/LOC to VOR/LOC	< 20 dB
VOR/LOC to VOR/LOC	< 40 dB
Glide slope from VOR/LOC	< 14 dB
Marker beacon to marker beacon	< 14 dB
Insertion loss
Glide slope port H22-1 and H23-1	0.5 dB max
VOR/LOC port, H22-1	0.5 dB max
VOR/LOC ports, H21-1, H23-1 and glide slope ports H24-1	3.5 dB max including power split
Marker beacon ports, H21-1	3.6 dB max including power split
Power handling	Receive only

Mechanical
Weight	4 oz max

Environmental
FAA	TSO C34c, C35d, C36d, C40c

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H Series Antenna Couplers