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𝗜𝗻𝗳𝗼𝗿𝗺𝗮𝘁𝗶𝗼𝗻 𝗮𝗯𝗼𝘂𝘁 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀, 𝗥𝗲𝘁𝘂𝗿𝗻𝘀, 𝗦𝗵𝗶𝗽𝗽𝗶𝗻𝗴 & 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴
Please note that unless otherwise specified, parts sold here may not currently meet the requirements of the Federal Aviation Administration (FAA). It is the buyer’s responsibility to ensure compliance with 14 CFR Chapter I or other applicable regulations, including any required FAA inspections or modifications. Please ask any questions before purchasing. While we aim to describe items accurately, the final determination of airworthiness and suitability remains the buyer’s responsibility.
Unless otherwise stated, all items are sold “AS IS” with no warranties implied.
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Dorne & Margolin Aircraft NAV/COM Receiver Diplexer
Model: DM H21-1
Manufacturer: Dorne & Margolin, Inc.
Serial Number: 9651
Offered for sale is a genuine Dorne & Margolin DM H21-1 aircraft NAV diplexer, designed to allow multiple navigation receivers to operate from a single antenna system.
This avionics component distributes signals between VOR/LOC, glide slope, and marker beacon receivers, enabling efficient antenna sharing within aircraft navigation systems.
Manufactured in Bohemia, New York, Dorne & Margolin diplexers are widely used in certified aircraft avionics installations and are known for their reliability and signal integrity.
Typical Frequency Ranges
• VOR / Localizer: 108–118 MHz
• Glide Slope: 329–335.3 MHz
• Marker Beacon: 74.75–75.25 MHz
Performance
• VSWR VOR/LOC:
Condition
Pre-owned avionics component in excellent condition and tested functional.
Shows normal cosmetic wear from previous installation.
Please review all photos carefully — the unit shown is exactly what will be shipped.
| Weight | 0.625 lbs |
|---|---|
| Dimensions | 10 × 3 × 4 in |
| Brand | Dorne & Margolin DM H21-1 H 21 1 H21 Diplexer |
| Manufacturer Part Number | Dorne & Margolin DM H21-1 H 21 1 H21 Diplexer |
| Manufacturer | Dorne & Margolin, Inc. |
| MPN | Dorne & Margolin DM H21-1 H 21 1 H21 Diplexer |
| Country/Region of Manufacture | US |
| Condition | Used |
| Condition Details | See Pictures for Details Nice, pre-owned and tested unit fully functional Guaranteed to pass your Inspection or your money back |
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