1765 HF Broadband Dipole Antennas

Type 1765 Series GRANGER ™

HF Broadband Dipole Antennas

1.6-30 MHz Frequency Range

Up to 10 kW Average 20 kW

Peak Power Rating

Horizontal Polarization

Omnidirectional

2.0:1 Nominal, 2.5:1

Maximum VSWR

Short-to-Medium Range

Communications

No Resistive Loading,

Switching or Tuning

Omnidirectional

An omnidirectional radiation pattern at the lower frequencies denotes improved coverage to and from base stations over short-to-medium ranges.

Improved Reliability and Efficiency

As the first truly broadband dipole HF antenna, the 1765 is designed to directly replace existing families of narrow band dipole antennas. The design of the radiating elements has increased the bandwidth over which the azimuth plane pattern is omnidirectional up to four times the lower frequency limit. The unique feature of having the support masts installed approximately 19° off vertical permits the outboard guy anchors to be in the same plane as the top of the mast. This reduces the ground area required for any given size of radiating curtain by approximately 30 percent.

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The 1765 antennas require no tuning or resistive loading circuitry. This permits complete compatibility with multichannel fixed-tuned radios as well as frequency agile, synthesized

HF radio equipment. Elimination of the antenna coupler maximizes the power output of the antenna/transmitter, resulting also in a significant improvement in communication reliability through the reduction of maintenance and/or repair.

Characteristics

Type

Frequency Range, MHz

Power Rating, kW

Polarization

VSWR

Gain, dBi

Wind Survival Rating, mph (km/h)

Without Ice

With 0.5 in (12 mm) Radial Ice

High Take-off Angle

The elevation plane radiation patterns at the lower frequencies denote maximum power is radiated at high angles ensuring reliable communications over short-tomedium ranges.

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.

HF broadband dipole

1.6 to 4.3 lower limit, 30 maximum

Up to 10 average, 20 peak

Horizontal

2.0:1 nominal, 2.5:1 maximum

8 nominal

140 (224)

50 (80.5)

2

Azimuth Plane Radiation Patterns at Beam Maximum

(Directive gain in dBi)

Elevation Plane Radiation Patterns

(Orthogonal to Dipole Length)

3

Antenna Dimensions

Ordering Information

Type Number Frequency Range MHz

1765-101-(*)

1765-120-(*)

1765-121-(*)

1765-122-(*)

1.6-30

2.0-30

2.4-30

3.4-30

1765-123-(*) 4.3-30

*See following table for appropriate suffix to Type Number

Type Number Suffix

1K

2K

3K

4K

5K

6K

10K

Power Rating kW

Average

10

1

2.5

10

Receive Only

Receive Only

5

Length ft (m)

230 (70)

184 (56)

160 (49)

115 (35)

90 (27)

Peak

20

2

5

20

Receive Only

Receive Only

10

Dimensions Height ft

(m)

85 (26)

69 (21)

59 (18)

40 (12)

30 (10)

Width ft (m)

167 (51)

135 (41)

115 (35)

81 (25)

62 (19)

Input Impedance ohms

300 Balanced

50

50

50

75

50

50

Input Connector

Open Line

Type N Jack (female)

7/8” EIA

1-5/8” EIA

Type N Jack (female)

Type N Jack (female)

7/8” EIA

Bulletin 1420B

05/08 Data subject to change without notice.

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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