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Serving the Aviation Industry since 1973
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DM H23-1 Antenna Couplers
Frequency 108-118 MHz 329-335.3 MHz
(DAI Part# DMH23-1)
These Antenna Couplers are specifically designed to couple multiple receiver systems to a single antenna with a minimum of insertion loss. 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 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.
Similar Items
AV571 - RAMI 2 VOR 1 GS SPLITTER
CI505 - COMANT DIPLEXER 2 VOR/1 GS

SPECIFICATIONS
Electrical
Frequency Range 118 to 118 MHz
329 to 335.3 MHz
VSWR <1.5:1
Impedance 50 OHMS
Isolation VOR/LOC–VOR/LOC
> 20dB
VOR/LOC from glide slope
> 40 dB
Glide slope from VOR/LOC
> 14 dB
Insertion Loss Glide slope port DM H22-1
0.5 dB max & DM H23-1
VOR/LOC port, DM H22-1 0.5 dB max
VOR/LOC ports, DM H21-1,
3.5 dB maximum including power split
DM H23-1 & glide slope
Ports DM H24-1
TSO C34c, C35d, C36d, C40c
Mechanical
Weight 4 oz. maximum
Harris (D&M/EDO)
Antennas, Couplers, Diplexers
ANTENNAS
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ComDat
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