Digital Mode HF MiniLoop

This is a small Digital Broadband MiniLoop Antenna that provides 0-2500km coverage on 10MHz through 54MHz, which has:

• Receive with low noise characteristics from 1.8MHz through 1GHz and higher frequencies.
• Transmit support without a tuner for Digital Modes from 10MHz through 54MHz.

SPECIFICATIONS

• Deployable in two configurations:
  • a. Small & Compact with three concentric loops that measure 20″ x 20″ and
  • b. Convertible to dual side-by-side loops that Maximizes Efficiency and measures 20″ x 32″.
• For use with equipment that supports digital quantum and/or spread-spectrum frequencies.
• Missions that require digital communications using Ground-wave and/or Skywave signal patterns.
• Useful when an isolated solution is required that requires no counterpoise.

Power Rating:

Option 1: 5W minimum digital input signal required with a maximum input power rating of 5W for 100% duty cycle (Digital Modes). Including but not limited to the MIL-STD-188 M110a digital communications mode that is rated at 5 watts continuous with bursts of 20 watts digital for up to 1 minute using the MIL-STD Data Modem Terminal (MS-DMT) and Automated Message Terminal (AMT) software applications.

Option 2: 5W minimum digital input signal required with a maximum input power rating of 25W for Digital Modes. Including but not limited to the MIL-STD-188 M110a digital communications mode that is rated at 25 watts continuous with bursts of 100 watts digital for up to 1 minute using the MIL-STD Data Modem Terminal (MS-DMT) and Automated Message Terminal (AMT) software applications.

ANALYSIS

The following results were nearly identical, whether taken indoors, outside, or in a backpack.

Analysis from 0-1GHz

Analysis from 0-54MHz

WSPR TX Test baselines at 250mw

For TX we purposely tested the loop while deployed between two metal buildings & at 250mw.

NOTE – TX efficiencies increase as power increases, which can lower the usable frequency.

WSPR 30M TX Test

Coverage = 236km to 1506km

WSPR 20M TX Test

Coverage = 675km to 2427km

WSPR 40M RX Test

For all RX tests we purposely tested the loop while deployed indoors and between floors of a multi-story building.

Max Range = 1337km

WSPR 30M RX Test

Max Range = 1797km

WSPR 20M RX Test

Max Range = 1838km

USAGE SCENARIOS

Although deployable in the following Usage Scenarios, here we display one option in this depiction.

Where secrecy is paramount, communication through unseen methods plays a crucial role. Some of the usage scenarios of clandestine antennas include:

1. Clandestine Communications in Cyber-Denied Environments:

• Context: In an era where internet-based communications are vulnerable to surveillance and attacks, intelligence operatives seek alternative methods.
• Scenario: Imagine a situation where an operative needs to communicate without exposing themselves to internet-based surveillance.
• Solution:
  • Physical Separation: Platforms physically separated from the internet can be used. These platforms are not susceptible to internet-based surveillance or attacks.
  • Radio Technology: Combine modern computer-based software with radio technology.
• Importance: Counterintelligence and law enforcement must adapt to these evolving communication methods.
• Countermeasures: Detect radio-based clandestine communications and secure evidence.

2. Operational Scenarios where concealment and minimizing visibility are critical:

• Inside a Parked Car:
  • Example: Monitoring a nearby building while parked outside.
    • Setup: Transmitter, receiver, and antennas positioned out of sight from windows.
  • Between Floors in an Office Building:
    • Example: Operating from the third floor to the first floor.
      • Setup: Transmitter, receiver, and antennas positioned out of sight carried out of site under clothing.
    • Out in the Open:
      • Example: Providing regional communications support while deployed in the field.
        • Setup: Transmitter, receiver, and antennas positioned out of sight inside a backpack.

Remember, clandestine antennas are designed to operate covertly, avoiding detection by adversaries. Their success lies in striking a balance between effective communication and maintaining secrecy with a right sized antenna.

All these solutions are enabled by the Broadband Alpha Loop.

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