HF Half Loop Vehicle Antennas

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  • Index to Subjects
    … Transmitted on a Fading FMVI Carrier, Error Probabilities for: Sep 1613 Telemretering: Bandwidth Compression Using Airborne Spectrum Analyzers: Apr 694 Interplanetary: Apr 679 Pro"lem of Re-entrant Space Vehicles : Apr 703 Signal-To … … Organization, TASO: Jun 993 Antennas , Operational Patterns of Direc … Cryotrons: Sep 1562 Thin-Film Memory, Vacuum Evaporated Ran- dom Access: Oct 1728 Thin Magnetic Films, Hysteresis Loops of: Jun 1165 Time and Frequency … … Aug 1489 Transmitter Power Requirements for HF Iono- spheric Circuits, Influence … … 6 Milli- meter Band, Half -Watt CWV .
  • HF 125 W half-loop antennas in ALE and ECCM for land mobile, navy and helicopter use
    This paper describes a small sized mobile HF half - loop antenna and its integrated agile coupler designed to work with a 125W transceiver in ALE and/or Frequency Hopping (FH). The half-loop concept can apply to small vehicles , shelters, ships, helicopters and airplanes, and can be …
  • AEA 218/ANT 218 NVIS antenna system
    The NVIS-type antenna system is composed of an agile antenna tuning unit (AEA 218) and a whip antenna (ANT 218) converted to a half - loop . … 1,000 km with no skip zone, require no special installation on the vehicle , and have no … … services of the SYSTEME 3000, providing discrete and secure voice and data transmissions throughout the HF band.
  • Performance of a small loop antenna in the 3-10 MHz band
    Although loop antennas of 1-2 m2 area do not appear, on present evidence, to possess good radiation effi- ciency at the low end of the HF band, this does not necessarilyrule them out as effective components in practical applications. Loops have to be judged against the performance of the availablealternatives,taking into account the constraints imposed by mobile use on small vehi- cles . That is why small HF loops and half -loops enjoy a steady level of usage in the …
  • Electrically small half-loop antenna analysis by numerical emulation
    This paper discusses the detailed computational electromagnetic analysis of an electrically small HF half - loop antenna system mounted on a flat conductive plate. Military command vehicles employ a wide range of communication assets to maintain tactical command and control while …
  • The application of characteristic-mode techniques to vehicle-mounted NVIS antennas
    … balloon) The system was calibrated to measure the absolute field strength at the balloon, normalized to a transmitter power of 1W, after correctingfor any mismatch losses within the system Half -wavelength,horizontal dipoles at … … were used as reference antennas for all measurements. … between the measured and computed radiation pattems for the whip antenna on the vehicle at 2 8 … By contrast, in Figure 18a,the vertical loop with single feed at 2 8 MHz shows no … HF anlenna .
  • 1979-1980 Conference Index
    Marine- vehicle … Roger H.; NTC 80 Vol 3 Paper 61.2 adaptive arrays, airborne UHF antennas for jamming protection … … PLANS 80 477-493 frequency-hop spread-spectrum systems; narrowband interference rejection in half -duplex systems; Elhakeem … transform receiver implementation; Mahmood, Sultan; NTC 80 Vol 3 Paper 61.6 HF receiver performance improvement; Rohde, Ulrich L.; NTC 79 Vol 2 Paper 22 … … Vol 3 1188-1194 jitter accumulation in PAM systems using phase-locked loops or resonant circuits for …
  • Multimode Multiband Antenna
    … with individual bands of operation can be distributed over the body of a vehicle and fed via … In this case a tunable antenna design appears to be the way to go. This section describes the conventional one-turn loop and the less conventional multi-turn loop. One-turn loops and half loops, i.e., half loop over a ground plane, have sizes useful at VHF and UHF for yehicular and manpack antennas, whereas a multi-turn loop appears to be a better candidate for the HF band.
  • HIGH-FREQUENCY RADIOS - Smaller, smarter HF radios provide antidote to digitisation debits
    The second transceiver on display was a half -size 5 W unit that Huneed is developing jointly … … developed by Saab Grintek, whose earlier offerings have included the TR178 10 W HF patrol radio and … The TR2000's modular construction allows field repair in less than 20 minutes, and it comes with a range of antenna types including a manportable NVIS (near-vertical incidence skywave) antenna, plus dipole, whip, wideband and vehicle - loop types.
  • An optimised vehicular loop antenna for NVIS applications
    It is essentially a measure of the gain of the antenna towards the zenith but with the requirementthat the power radiatedby the antenna should fall within a cone, centred on the zenith, of half -angle equal to 45". This quantity is expressed as a The loop antenna mounted on a long wheel-base Land Rover … … while, in practice, B was at the right-hand front corner of the vehicle in order to … … presented in (1) based on a series of trials conducted on the calibrated HF test range at …