KU BAND SEATEL 132975-A OPTIM MICROWAVE OMT75K-001 SN NO-05186

1. Product Identification & Context:

• Product Type: Orthomode Transducer (OMT).

• Application: Satellite Communications (SATCOM) in the Ku-Band frequency spectrum (typically ~10.7-12.75 GHz for receive, ~13.75-14.5 GHz for transmit).

• System Integration: Designed for use with a SEATEL 132975-A maritime or stabilized VSAT antenna system.

• Manufacturer: OPTIM MICROWAVE (a recognized manufacturer of RF/microwave components).

• Model: OMT75K-001. This model number specifies the exact electrical and mechanical design for the Ku-band and its interface.

• Unique Identifier: Serial Number NO-05186. This is crucial for tracking manufacturing history, calibration, and warranty.

2. Key Function & Purpose:
An OMT is a critical waveguide component in a satellite antenna’s feed assembly. Its primary functions are:

• Polarization Separation/Combination: It separates two orthogonally polarized signals (typically Linear Horizontal and Linear Vertical, or Left-Hand and Right-Hand Circular) received from the satellite into two separate waveguide ports. In transmit mode, it combines two polarized signals into a single waveguide for radiation.

• Diplexing Function: Often integrated with a filter to separate the Transmit (Tx) and Receive (Rx) frequency bands within the same polarization path, allowing a single antenna to simultaneously send and receive signals.

• Isolation: Provides high isolation between the Tx and Rx paths and between the two polarization ports to prevent interference.

3. Typical Technical Characteristics :

• Frequency Bands:

  • Rx Band: ~10.7 – 12.75 GHz

  • Tx Band: ~13.75 – 14.5 GHz

• Polarization: Dual Linear (Vertical & Horizontal) or Dual Circular. The “OMT75K” suggests a standard Ku-band OMT.

• Waveguide Interface: Likely uses standard waveguide flanges (e.g., CPR-229F or similar) for connection to the antenna feed horn and the downstream Low-Noise Block Downconverter (LNB) and Block Upconverter (BUC).

• Isolation: High (>60 dB) between Tx/Rx and between polarizations.

• Insertion Loss: Very low (<0.5 dB) to preserve signal strength.

• Power Handling: Capable of handling the output power of the BUC (e.g., 2W, 5W, 16W+).

4. Role in the SEATEL Antenna System:
In the SEATEL 132975-A antenna system, this OMT is the core RF junction. It connects to:

• Upstream: The antenna’s feed horn.

• Downstream (Rx Path): LNBs (one for each polarization).

• Downstream (Tx Path): The BUC (amplifies the signal for transmission).
  It enables the single antenna to provide dual-polarity, full-duplex (simultaneous send/receive) communication, which is essential for efficient maritime VSAT broadband connectivity.