Description
Extended Antenna Placement
The kit allows the Maruwa antenna to be installed up to 5 ft. away from the connected SkyLink terminal. This is useful when the terminal is mounted inside a cabinet, vehicle compartment, communications enclosure, or other location that does not provide the antenna with a suitable view of the sky.
The antenna should be positioned vertically in an open location with as few overhead or surrounding obstructions as practical. Mounting hardware should be selected separately according to the installation surface and operating environment.
Reliable Iridium Reception
The included Maruwa MHL-1621C is a passive dielectric-loaded decafilar-helix antenna designed for the Iridium satellite frequency band. Its broad beamwidth and right-hand circular polarization help it receive signals from satellites across a wide portion of the sky without requiring precise directional aiming.
The antenna is suitable for Iridium satellite terminals, messaging systems, asset tracking, logistics management, emergency location, disaster communications, and remote research equipment.
Interference Management
The antenna’s balanced design helps reduce common-mode noise from the connected equipment. It also provides integrated filtering that can attenuate signals from common cellular and ISM frequency bands by as much as 30 dB, helping reduce interference in installations containing multiple radios or electronic systems.
Cable and Connector Configuration
The kit includes a 5 ft. LMR-240 coaxial cable terminated with TNC male and SMA male connectors. LMR-240 provides a practical balance between flexibility and RF loss for short antenna extensions. Custom cable lengths can be supplied when the standard cable does not match the planned installation.
Technical Specifications
Dimensions
- Antenna diameter: 23 mm / 0.91 in.
- Antenna height: 57 mm / 2.24 in.
- Cable length: 1.52 m / 5 ft.
Weight
- 34 g / 1.2 oz.
Durability
- Operating temperature: -40°C to 85°C / -40°F to 185°F
Included
- Maruwa MHL-1621C Iridium dielectric-loaded decafilar-helix antenna
- 5 ft. LMR-240 coaxial cable with TNC male and SMA male connectors
Additional
- Compatible equipment: Select Blue Sky SkyLink systems
- Manufacturer part number: SL100-MRW
- Custom cable lengths: Available upon request
Data Network
- Satellite network: Iridium
- Antenna model: Maruwa MHL-1621C
- Antenna type: Passive dielectric-loaded decafilar-helix antenna
- Center frequency: 1621 MHz
- Bandwidth: 60 MHz
- Polarization: Right-hand circular polarization
- Impedance: 50 ohms
- Gain: 0 dBic at zenith
- Beamwidth: Greater than 135°
- VSWR: Less than 2.0:1
- Interference attenuation: Up to 30 dB for common cellular and ISM frequencies
Interfaces
- Antenna connector: SMA male
- Extension cable connectors: TNC male to SMA male
- Cable type: LMR-240




























































