Type 2753 Series GRANGER™ Conical Monopole Antennas 6:1 Bandwidth Permits Frequency Change without Antenna Tuning Up to 50 kW Peak Power Rating 50-ohm Input Provides 2.0:1 VSWR without Impedance Transformers A Space Saving Antenna for Ground-to-Air and Shore-toShip Transmission Short-,Medium-, Long-Range Communications General Description The 2753 Conical Monopole Antenna Series replaced the 753C Conical Monopole Antenna Series, providing a number of improvements in specification. All versions are of the same configuration, differing only in size. The radiating structure is in the form of a cage supported by a central tower. The lower part of the antenna tower forms a compensating inductive stub in shunt with the feed terminals. This arrangement keeps the structure at dc ground potential, thereby eliminating the need for a base supporting insulator or for isolation of any required lighting circuit. The antenna is supplemented by a radial ground screen composed of softdrawn copper wire. Application The 2753 Conical Monopole Antenna Series provides a cost-effective solution for the vertical omnidirectional antenna if the full bandwidth of the MONOCONE Type 1794 is not required. Many applications are satisfied by the six to one frequency bandwidth of the monopole and its elevation plane characteristics. Such services include: Ground Wave Shore-to-Ship 1.6-3.8 MHz Base station-to-mobile, short range Skywave Medium-to long-range ground-to-air Base station-tooutstations requiring medium to low angle Shore-to-ship HF service Omni HF Broadcast including meteorological service. 1 Accessories The following accessories are available for ease of installation and maintenance: tower lighting kit, erection kit, paint kit, tool kit, lightning rod kit, anti-climbing kit, and spares kit. Transportable The 2753T-6, transportable version, follows the same electrical design as the fixed versions. Erected dimensions are similar. Materials are selected for their rugged nature and reuse in the field. The radiating curtain and ground screen are of stainless steel flexible wire; the mast is aluminum lattice of 17 inch face width; guy members are Terylene or Parafil; anchors are stake of duckbilled type. VSWR measured in the field is typically within 2.0:1 (2.5:1 max.). The antenna is complete with reusable packaging and erection tools. Characteristics-2753, Fixed Version Peak Power Rating, kW Polarization VSWR Input Impedance, ohms Input Connector (end seals available) Directive Gain dBi Azimuth Plane Radiation Pattern Wind Survival Rating, mph (km/h) Without Ice With 0.5 in (13 mm) radial ice Tower Erection Kit Up to 50 Vertical 2.0 nominal, 2.3 max. 50, coaxial Type N Jack (female) (-1K) Receive or 7/8” EIA flange (-2K) 1-5/8” EIA flange (-3K) 3-1/8” EIA flange (-4K) 5.0 (over perfect ground) Omnidirectional ± 0.75 dB 1kW avg., 2kW PEP 5kW avg., 10 kW PEP 10 kW avg., 20 kW PEP 25 kW avg., 50 kW PEP 120 (190) 100 (160) A kit of simple erection tools is available for erection of the antenna without the use of a crane Characteristics-2753T, Transportable Version (same as Fixed Version except as follows) Frequency Range, MHz Input Connector Wind Survival Rating, mph (km/h) Without ice With 0.5 in (13 mm) radial ice 4.0 to 24.0 Type N Jack (female) (-1K) Receive of 7/8” EIA flange (-2K) 1-5/8” EIA flange (-3K) 1 kW avg., 2 kW PEP 5 kW avg., 10 kW PEP 10 kW avg., 20 kW PEP 100 (160) 50 (80) 2 Elevation Plane Radiation Patterns Ordering Information Type Number Frequency Range MHz Height ft (m) 2753-1-(*) 2753-2-(*) 2753-4-(*) 2753-6-(*) 2753T-6-(**) 2753-8-(*) 1.6-9.6 2.0-12.0 2.8-16.8 4.0-24.0 4.0-24.0 6.0-28.0 100 (30.5) 80 (24.4) 60 (18.3) 40 (12.2) 40 (12.2) 27.5 (8.4) * Complete part number requires addition of input connector suffix; 1K, -2K, -3K or -4K (see characteristics table). Bulletin 1531C 05/08 Data subject to change without notice. Ground Screen Diameter ft (m) 300 (91) 240 (73) 170 (52) 120 (36) 120 (36) 80 (24) Outer Guy Radius ft (m) 90 (27.5) 61 (18.6) 55 (16.7) 35 (10.6) 35 (10.6) 21 (6.5) ** Complete part number requires addition of input connector suffix; 1K, -2K or -3K (see characteristics table). 3 ASC Signal Corporation • 606 Beech Street West • Whitby, Ontario, Canada • L1N 5S2 • t. +1 (905) 668 3348 • f. +1 (905) 668 8590 • www.ascsignal.com