Log-Periodic Antennas
The Aluminum-Titanium material allows the construction of light weight, elastic Log-Periodic antennas which - at the same time - provide low wind loads.
Log-Periodic antennas cover a wide frequency range without switching elements and are fed with just a single coax cable. Gain, bandwidth and front to back ratio remain constant over the entire frequency range - in contrary to monoband or trapped yagis.
No traps or other loading techniques will limit the useful output power to the antenna.
We use a double-boom feeding technique and a new kind of element to boom mounting. Special cross clamps provide a large contact surface for excellent RF-performance. The crossing of elements is executed by the double-boom.
The applied transmitting power is mainly limited by the power capability of the coax cable. Due to the double-boom the input impedance of the Log-Periodic antenna can be directly matched to the feed line. Additionally, the double-boom gives the antenna extreme horizontal and vertical stability. No drillings weaken the mechanical stability of the boom!
 
DLP 11 11 Element Wire Log-Periodic 7MHz - 30MHz
DLP 15 15 Element Wire Log-Periodic 7MHz - 30MHz
DLP 20 20 Element Wire Log-Periodic 7MHz - 30MHz
DLP 22 22 Element Wire Log-Periodic 3.5MHz - 30MHz
 
DLP 11
Very low wind load: 330N (at 120km/h)
Low weight: 13kg (29lb.) DLP 11L: 9kg (20lb.)
Power handling: 5kW PEP
Optically very inconspicuous appearance through the use of wire elements
No swinging elements at strong wind
No balun necessary
Double-boom (40 / 18mm) electrically fed - increased gain
High number of elements due to wire stringing
No corroding parts through the use of special stainless steel clamps
Best low angle radiation through high number of elements
Crossing-free feeding of all elements with a defined impedance
Feeding with just a single coax cable for all seven bands (50 Ohm)
Loss-free linear loading feeding on 10MHz, full-size rotary dipole on 7MHz
Suppression of strong BC transmitters in the 7-13MHz range because 7 and 10MHz are designed as skip-frequencies (resonant bands)
Boom length: 6m (19.7ft.)
Longest element: 10.30m (33.8ft.)
Turning radius: 5.40m (17.7ft.)
Gain: 14-30MHz: 5.3dBd, 7MHz: 1dBd, 10MHz: 1dBd
Front-to-back ratio: 15-20dB from 14-30MHz
VSWR: typically 2:1 and better on the amateur radio bands
 
DLP 15
Very low wind load: 500N (at 120km/h)
Low Weight: 22kg (49lb.)
Optically very inconspicuous appearance through the use of wire elements
No swinging elements at strong wind

Power handling: 5kW PEP

No balun necessary

Double-boom (60/18mm), electrically fed = increased gain

High number of elements due to wire stringing
No corroding parts through the use of special stainless steel clamps

Best low angle radiation through high number of elements

Crossing-free feeding of all elements with a defined impedance

Feeding with just a single coax cable for all seven bands (50 Ohm)
Loss-free linear loading feeding on 10MHz, full-size rotary dipole on 7MHz
Suppression of strong BC transmitters in the 7-13MHz range because 7 and 10MHz are designed as skip-frequencies (resonant bands)
Boom length: 8m (26.2ft.)
Longest element: 10.42m (34.1ft.)
Turning radius: 5.78m (19ft.)
Gain: 14-30MHz: 6.5dBd, 7MHz: 1dBd, 10MHz: 2dBd

Front-to-back ratio: 20-25dB from 14-30MHz

VSWR: typically 2:1 and better on the amateur radio bands

 
DLP 20
Bands: 40m, 30m, 20m, 17m, 15m, 12m, 10m
Very low wind load: 800N (at 120km/h)
Low Weight: 32kg (71lb.)
Optically very inconspicuous appearance through the use of wire elements
No swinging elements at strong wind
Power handling: 5kW PEP (40m - 10m)
No balun necessary
Double-boom (60/18mm), electrically fed = increased gain
High number of elements due to wire stringing
No corroding parts through the use of special stainless steel clamps
Best low angle radiation through high number of elements
Crossing-free feeding of all elements with a defined impedance
Loss-free linear loading feeding on 10MHz, full-size rotary dipole on 7MHz
Suppression of strong BC transmitters in the 7-13MHz range because 7 and 10MHz are designed as skip-frequencies (resonant bands)
Boom length: 12m (39.3ft.)
Longest element: 10.42m (34.1ft.)
Turning radius: 6.8m (22.3ft.)
Gain: 14-30MHz: 7.5dBd, 7MHz: 1dBd, 10MHz: 2dBd
Front-to-back ratio: 20-25dB from 14-30MHz
VSWR: typically 2:1 and better on the amateur radio bands
 
DLP 22
Rotary Dipole on 80m: Very high efficiency through the use of TITANEX-High-Q-coil TC100. Best DX characteristics
Bands: 80m, 40m, 30m, 20m, 17m, 15m, 12m, 10m
Very low wind load: 800N (at 120km/h)
Low Weight: 32kg (71lb.)
Optically very inconspicuous appearance through the use of wire elements
No swinging elements at strong wind
Power handling: 5kW PEP (40m - 10m), 3kW PEP on 80m
No balun necessary
Double-boom (60/18mm), electrically fed = increased gain
High number of elements due to wire stringing
No corroding parts through the use of special stainless steel clamps
Best low angle radiation through high number of elements
Crossing-free feeding of all elements with a defined impedance
Feeding with two coax cables (one for 80m, one for 40m-10m)
Loss-free linear loading feeding on 10MHz, full-size rotary dipole on 7MHz, rotary shortened dipole on 3.5MHz through use of TITANEXHigh-Q-coil TC100. The rotary dipole for 80 can either be tuned to 80m CW or 80m SSB.
Suppression of strong BC transmitters in the 7-13MHz range because 7 and 10MHz are designed as skip-frequencies (resonant bands)
Boom length: 12m (39.3ft.)
Longest element: 10.42m (34.1ft.)
Turning radius: 6.8m (22.3ft.)
Gain: 14-30MHz: 7.5dBd, 7MHz: 1dBd, 10MHz: 2dBd, 3.5MHz: 0dBd
Front-to-back ratio: 20-25dB from 14-30MHz
VSWR: typically 2:1 and better on the amateur radio bands

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Last updated: June 25, 2014