SPR-230 HF Log Periodic Spiral Antenna 2-30 MHz 5 dBi Omni
Frequency Range: 2-30 MHz
Gain: 5 dBi
VSWR: 2:1 Max
Polarization: Horizontal
Pattern: Omnidirectional
Size: 40′ H
Military Nomenclature: EAN113-2
Model Number: SPR-230
View Product Specs PDF | Request Quote
Not finding what you’re looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.
Description
Applications:
The SPR-230 log spiral antenna is suitable for short range (0-300 miles) skywave circuits. The horizontal polarization permits operation over all types of soil without the need for a ground screen. The antenna operates over the frequency band of 2 to 30 MHz without need for a coupler. The designs permit operation from receiving applications to transmitting applications up to 50 kW PEP. Harsh environmental capabilities are achieved through appropriate material selection.
Features:
The SPR-230 antenna is designed using log periodic principles to achieve broadband performance while mounting over earth. At frequencies below 20 MHz, the antenna provides a broad, horizontally polarized beam directed at the zenith to accommodate short range skywave circuits. At higher frequencies the beam maximum occurs at lower elevation angles to accommodate longer paths. Each radiating element is a continuous length of alumoweld wire insuring long life noise free performance. The spiral curtain is supported by six radial catenaries which are pre-assembled from alumoweld strand and are supported at the center by a galvanized steel mast. The extremities of the radial catenaries are supported by aluminum towers. The military standard versions use wood poles instead of towers. Custom versions use counterweights to limit tensions and severe environments.
Characteristics:
The antenna is elliptically polarized. In the northern hemisphere, the transmit antennas are normally polarized in the right hand sense and receive antennas are polarized in the left hand sense to accommodate the characteristic wave (lowest loss mode) in the ionosphere where reflection occurs. For longer paths utilizing lower radiation angles a circularly polarized wave is refracted by the ionosphere instead of reflected and the sense of elliptical polarization becomes unimportant.
Equipment Supplied:
Radiating element, radio catenaries, towers and guys, center support mast, balun transformer, resistive terminations, 6061-T6 aluminum towers.
Optional Equipment:
Obstruction lights, erection kit, repair kit, repair tool kit, wood poles, counterweights.
Spec Sheet
Spec Sheet
SPECIFICATIONS |
PERFORMANCE |
---|---|
Azimuth Pattern | Omnidirectional +/- 3 dB |
Power Capability, /1 Version | 1 kW avg/2 kW PEP |
Power Capability, /2 Version | 10 kW avg/20 kW PEP |
Wind Loading | 140 MPH no ice, 90 MPH, 1/2 inch ice |
Input Connector/ 2 Version | 1-5/8 Inch EIA |
Shipping Weight | 2,850 |
VSWR | 2.0:1 Maximum |
Frequency Range | 2-30 MHz |
Power Capability, /3 Version | 25 kW avg/50 kW PEP |
Curtain Diameter | 250 Ft. |
Site Diameter | 297 Ft. |
Input Connector/ 3 Version | 3-1/8 Inch EIA |
Height | 40 Ft. |
Gain | 5 dBi Over Average Ground |
input Impedance | 50 Ohms Unbalanced |
Shipping Volume | 75 |
Military Nomenclature | AS-3476/G |
Input Connector/ 1 Version | Type “N” Female |
Related products
BDP-230 HF Fixed Broadband Dipole Antenna Omni 2-30 MHz
Frequency Range: 2-30 MHz
Gain: 5 dBi
VSWR: 2.5:1 or less
Polarization: Horizontal
Pattern: Omnidirectional
Size: 250' L
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.

LPV-1611 HF Long Range LP Dipole Antenna x4 Array 5-30 MHz 111 ft
Four independent LPV-1211 antennas arranged in a rosette configuration about a single tower.
Frequency Range: 5.4-30 MHz
Gain: 12 dBi
VSWR: 2:1 Max
Polarization: Vertical
Size: 111' H x 160' W
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.

LPV-1211 HF Long Range LP Dipole Antenna 5-30 MHz 12 dBi 111 ft
Frequency Range: 5.4-30 MHz
Gain: 12 dBi
VSWR: 2:1 Max
Polarization: Vertical
Size: 111' H x 160' W
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.

MAS-5 HF Multiport Antenna w/RLPA 2-30×2/4-30×3 MHz 106 ft
- Frequency Range: 2-30, 4-30, 2-30, 2-30, 4-30
- Gain: 7, 7, 7, 7, 9-12 dBi
- VSWR: 2.0:1 typical, 4.0:1 Max, 2.5:1 typical, 2.0:1 typical, 2.0:1 typical, 2.0:1 typical
- Polarization: Elliptical, Vertical, Horizontal, Elliptical, Horizontal
- Pattern: Omni, Omni, Omni, Omni, Directional
- Size: 106' H x 100' L x 100' W
MAS-2 HF Multiport Antenna w/RLPA 2-30×2/4-30×2/6-30 MHz 106 ft
Heavyweight multiport (4 Omni, 1 Directional) spiral with 6-30 Mhz RLPA.
- Frequency Range: 2-30, 4-30, 2-30, 2-30, 6-30 MHz
- Gain: 7, 7, 7, 7, 12 dBi
- VSWR: 2.0:1 typical, 2.5:1 typical, 4.0:1 Max, 2.0:1 typical, 2.0:1 typical, 2.0:1 typical
- Polarization: Elliptical, Vertical, Horizontal, Elliptical, Horizontal
- Pattern: Omni, Omni, Omni, Omni, Directional
- Size: 106' H x 100' L x 100' W
VOBA-IV HF Broadband Antenna 3.9-30 MHz 2 dBi Omni
Frequency Range: 3.9-30 MHz
Gain: 2 dBi
VSWR: 2:1 max
Polarization: Vertical
Pattern: Omnidirectional
Size: 45.5' H, 233' D
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.

VOBA-IIA HF Broadband Antenna 2.7-30 MHz 2 dBi Omni
Frequency Range: 2.7-30 MHz
Gain: 2 dBi
VSWR: 2:1 max
Polarization: Vertical
Pattern: Omnidirectional
Size: 66.5' H, 340' D
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.

VOBA-I HF Broadband Antenna 2-30 MHz 2 dBi Omni
Frequency Range: 2-30 MHz
Gain: 2 dBi
VSWR: 2:1 max
Polarization: Vertical
Size: 88' H, 450' D
Pattern: Omnidirectional
Model Number: VOBA-I
Military Nomenclature: AS-3797/GRC
View Product Specs PDF | Request Quote
Not finding what you're looking for? We can custom-build antennas to your exact specifications.
Contact us here or call 1-940-325-3301 for more information.
