BC-DX TopNews WWDXC #945 BC-DX 945

RCA 2/2 (High Performance Rotatable Curtain Antenna) is a highly
interesting alternative system solution for broadband fixed curtain
antenna configurations.
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
- Higher gain (up to 19 dBi, or 3 to 6 dB more than typical LPD)
- Higher front-to-back ratio (6 to 10 dB more than typical LPD)
- Better power capability (up to 500 kW, as compared to the LPD with
an absolute maximum of only 250 kW)
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 180 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 20 azimuthal slewing
with considerable sidelobes, the new rotatable structure with a central
shaft has 360 azimuthal performance radiation patterns without sidelobes.
(from Thomson Radio Broadcast via Dec NASB Newsletter, direct and via
dxld)
RFCN VoN Abuja Lugbe
RTL Luxembourg, 5990 / 6095 kHz twins
Probably Sines, Portugal at right upper corner on page 1.
Curtain on page 2, probably Lampertheim or Biblis site in Germany.
One page 3 upper central column, RAA rotatable ALLISS 500 kW antena at
Qiqihar Heilongjiang-CHN, of April 2003y at
47 20 47.00 N 124 16 04.00 E
and on below left column probably Sines, Portugal site too.
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