BC-DX TopNews WWDXC #945 BC-DX 945

HP-RCA 2/2 services similar coverage areas as the classical LPD (Log
Periodic Dipole Antenna) with up to 45% higher efficiency of the radiated
power into a defined target area. Additional comparative figures of merit
include
In addition, the HP-RCA 2/2 has a better overall efficiency, requires less
land, is easier to maintain and affords better reliability with regard to
storms and electrostatic effects. The footprint of this powerful and
highly flexible system is surprisingly small. With dimensions
of 51m x 51m, the foundation surface needs less than 12m x 12m.
The covered area has a radius of approximately 50m.
With an overall weight of 80t, the antenna has a maximum survival wind
speed of 240 km and a maximum operational wind speed of 120 km. It takes
less than 3 minutes for a 180ø rotation. Based on a rigid array and a
tubular shaft, the HP-RCA 2/2 is a back-to-back arrangement of a low band
and a high band curtain antenna equipped with a reflector screen. The
2/2 configuration gives a good radiation pattern performance with
moderate structural effort.
Whereas the classical HR 2/2 curtain antenna solution is based on a fix
structure with phasing system limited to less than 20ø azimuthal slewing
with considerable sidelobes, the new rotatable structure with a central
shaft has 360ø azimuthal performance radiation patterns without sidelobes.
(NASB newsletter, Dec 2009)
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DX and SW meetings list 2010.
Hello, here follows a tentative list about DX and SW meetings to be held
this year. Updates and amendments are very welcome. best 73
Risto Vahakainu
Finnish DX Association
Shortwave Radio Meetings - 2010
Date: February 27 (1430-1700 BST)
Location: Reading International Solidarity Centre (RISC), 35-39 London
Street, Reading RG1 4PS, England
Organization: Reading International Radio Group
Expected Attendance: 20
More info:
Note: these Reading DX meetings are held with 1-2 months interval.
Next ones: 10 April, 5 June, 24 July
Dates: March 5-6
Location: Kulpsville, PA, USA
Organzation: Winter SWL Fest
Expected Attendance: 200
More Info:
Dates: May
Location: Ontario, Canada
Oganisation: National Association of Shortwave Broadcasters
More Info: (pages under construction)
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