RF-1936

® assuredcommunications™ RF-1936 (AS-2259/GR)/ RF-1938 PORTABLE CROSSED DIPOLE ANTENNA for NVIS (near vertical incidence skywave) communications The RF-1936/38 Series of antennas are man-portable and rapid-deployable for NVIS communications. The NVIS communication mode is for paths from 10 to 400 km. This communication mode is particularly useful in mountainous, heavily wooded terrain, or dry sandy soil where groundwave is limited. The RF-1936 is used for general purpose NVIS communication links out to 400 km; while the RF-1938 is designed for the hard to close 10 to 200 km links. These lightweight antenna systems are easily carried and installed by two people in five minutes (RF-1936) or 15 minutes (RF-1938). The sectional mast is a low loss coaxial feed line to feed unequal length crossed dipole radiating elements. The radiating elements are attached to guy ropes that provide mast support. The entire antenna stows within a small canvas bag. The RF-1938 has a second set of coaxial masts and guy lines which stow within a second canvas bag. Specifications for the RF-1936/RF-1938 Electrical I Frequency Range 2 to 30 MHz with antenna coupler I RF Power Capacity 400 Watts Typical Installation of an RF-1936 I Input Impedance Compatible with RF-5800H internal coupler and RF-382 Antenna Couplers I Radiation Pattern Azimuth: omnidirectional Elevation: see radiation patterns below I Polarization Horizontal for the RF-1936 or a RF-1938 Vertical if used with the monopole conversion kit option I VSWR In accordance with RF-5800H internal coupler and RF-382 Antenna Couplers I Gain See radiation patterns below Mechanical I RF Connector Side feed with wing nut I Dimensions Stowed: RF-1936: 1 bag 26" long x 7" dia. RF-1938: 2 bags 26" long x 7" dia. Deployed: RF-1936 – 61 by 61 ft. I Finish RF-1936P-10 RF-1936P-30 RF-1936V-10 RF-1936V-30 RF-1938AT-10 RF-1938AT-30 I Weight RF-1936: RF-1938: CARC 383 Green Semi Gloss Green CARC 383 Green Semi Gloss Green CARC 383 Green Semi Gloss Green 15 lb. 27 lb. I Height RF-1936: 15 ft. (4.6 m) RF-1938: 27.9 ft. (8.6 m) I Installation Time RF-1936: 5 min. with 2 people RF-1938: 15 min. with 2 people Environmental I Temperature Operating –40˚ to +55˚ C (–40˚ to +131˚ F) Storage: –60˚ to +70˚ C (–76˚ to +158˚ F) I Wind RF-1936: 60 mph (96 kph) with no ice Options I Monopole Conversion Kit: RF-1938-AT003 (convert RF-1936/38 to top loaded monopole) I Vehicular Antenna Adapter: RF-1936-01 (included with the RF-1936V) I Mounting Plate for flat surface: RF-1936-02 (included with the RF-1936P and RF-1938AT) Radiation Patterns Over Average Ground 12 MHz 8 MHz 4 MHz 2 MHz 0 12 MHz 8 MHz 4 MHz 2 MHz 0 -90 7dBi -3dBi -13dBi -90 2, 4, 8, 12 MHz Patterns for the RF-1936 Antenna -90 7dBi -3dBi -13dBi -90 2, 4, 8, 12 MHz Patterns for the RF-1938 Antenna Specifications are subject to change without notice. ® RF Communications Division | 1680 University Avenue | Rochester, NY USA 14610 www.harris.com 1-585-244-5830 assuredcommunications™ Copyright © 2005 Harris Corporation 8/05 DS-274A