Thank you for choosing the Cobweb Antenna model
RH-DX640
, a
lightweight and versatile antenna to be used in 8 amateur radio bands (6, 10,
12, 15, 17, 20, 30 and 40 meters).
Ideal for portable operation in field days, expeditions, camping,
portable operations as well as fixed stations. One of the main advantages is the
possibility of operating in the main amateur radio bands, and not taking too
much space.
This is an omnidirectional antenna and does not require a rotator. It has
an excellent SWR on all 8 bands. It can be mounted on a mast or tower and
works very well a few feet obove the ground (3 meters - 10 ft. or higher).
Do not hesitate to contact us in case of any suggestion or questions.
Have good Dxs with your new Cobweb Antenna RH-DX640.
3
18
(11 m band can be adjusted)
.....................................
Max. Power.................
400W PEP
Gain.............................
4.7dBi, 6m (20 feet) off the ground @ 14.2MHz
Minimum SWR ..........
1:1
Impedance ..................
50 Ohm
Conector .....................
PL-259 with coaxial cable 50 Ohm
Weight .........................
5.5 kg (12.1 lbs)
Dimension ...................
540 x 540 cm (212 x 212 inches)
TECHNICAL SPECIFICATIONS
Type .............................
Omnidirectional "Cobweb»
Reception* ..................
500kHz to 50,000kHz (50MHz)
Transmission ..............
6, 10, 12, 15, 17, 20, 30 and 40 m
Wind resistance ..........
Moderate to strong winds
Mast diameter ............
38 to 64mm (1-1/2" to 2-1/2")
*MW and SW reception reception with goog efficiency
Main material.............
Fiberglass, stainless steel, aluminum
The antenna was tested on air for 60 days, suffering the effects of the
weather such as sun, rain and wind. It proved to be quite stable and throughout
this period, with an Icom IC-7300 and Elecraft KX-3 radios, hundreds of
contacts were made in all bands.
It was noticed that when subjected to rain, the resonant frequency
changes, from 50 to 100kHz above the adjusted one. As soon as it dried, the
frequency returned to that previously set.
COMMENTS
The RH-DX640 antenna prototype was mounted on a roof, on a 3
meter (10 feet high mast).
