EAntenna Cobweb

Cobweb - 5 Band Antenna, Design by G3TPW New

EAntenna Cobweb

The Cobweb antenna is a antenna which is easy and fast to install for portable operations, designed by G3TPW.

The Cobweb antenna covers the five upper shortwave bands 20, 17, 15, 12 and 10m. One common balun feeds five dipoles which are folded in a roughly square shape, only one feedline is required. Due to the arrangement of the antenna elements and some ground effect the gain is slightly higher than for a dipole alone.

The antenna is built for a maximum power of 500W. The useable 2:1 SWR bandwidth covers a large part of each band. The frequency of the SWR minimum can be tuned by changing the length of the dipoles. Due to the square arrangement of the dipoles the overall size is very small, just 280 by 280 cm. Equally the wind surface is rather small, allowing a max. windspeed of 160 km/h. The base plate as well as the tube supporting the balun is made from aluminium, the tubes carrying the dipoles are made from glass fibre. The weight of the Cobweb is just 4.8 kg, this is convenient if the antenna is to be installed by a single person. A lightweight aluminium mast is sufficient to carry the antenna. These small sizes and the small packing size of 11 x 11 x 100 cm makes this antenna well suitable for vacations, fielddays, SOTA and other portable activities. Connector PL.

Technical Data 17822 Cobweb
Modell 0.5KW 3KW
Amateur radio bands 20, 17, 15, 12, 10 m
Max. Power 0.5 3 KW
Max. rotating radius 1.96 m
Weight 4.8 kg
Transport size 11 x 11 x 100 cm
Mast Diameter 32 - 52 mm
Gain [1] 20 m 7 7 dBi
17 m 7 7 dBi
15 m 7 7 dBi
12 m 7 7 dBi
10 m 7 7 dBi
Bandwidth 2:1 SWR 20 m 208 208 kHz
17 m 170 170 kHz
15 m 167 167 kHz
12 m 156 156 kHz
10 m 184 184 kHz
Bandwidth 3:1 SWR 20 m 362 362 kHz
17 m 299 299 kHz
15 m 293 293 kHz
12 m 271 271 kHz
10 m 337 337 kHz

[1] Gain when installed 10m above ground.

Order No.
17822 EAntenna Cobweb Antenna 340.00 € Add to shopping cart New In stock, shipped in 1 or two days.
17822.3K EAntenna EACOBW5B 3KW 5 BANDS 10-12-15-17-20m 440.00 € Add to shopping cart New Not in stock, ordered only on customer request, down payment required, delay at c. 10 days.
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