HSI AN RADIO STATION HSIEN YANG (SIAN HF COMMUNICATIONS FACILITY HSIENYANG DEPLOYED COMM/ELEC/RADAR FACILITIES CHINA SEPTEMBER 1969

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78T04563A000400010036-4
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 7
• Document Creation Date: December 28, 2016
• Document Release Date: January 21, 2003
• Sequence Number: 36
• Publication Date: September 1, 1969
• Content Type: REPORT

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~~~~C ~maery In#erp~ret~#ion Report
DEPLOYED COMM/ELEC/RADAR fACILiTIES
CHINA
SEPTEMBER 1969
Declass Review by NIMA/DOD
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ANG DECLASSIFICATION
NATIONAL
PHOTOGRAPHIC
INTERPRETATION
CENTER
NSI AN RADIO STATION NSIEN YANG
ASIAN NF COMMUNICATIONS FACILITY NSIENYANG)
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Hsi-an Radio Station Hsien-yang
NA
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34-22-31N 108-36-33E
ar~et Chart, Series 200, Sheet M0384-15HL, Jul 68 scale 1:200,000
ABSTRACT
This report, based on high-resolution imagery, describes the Sian High Frequency (HF)
Communications Facility Hsienyang (Hsi-an Radio Station Hsien-yang). It includes a
location map, annotated photography, and mensuration of significant features.
The facility contains 25 lattice towers supporting 20 horizontal curtain arrays, three
possible horizontal curtain arrays, an operations area, and a support area.
INTRODUCTION
The Sian HF Communications Facility Hsienyang (Figure 1) is located 5.8 nautical miles
(nm) northwest of Hsienyang, China, at an elevation of 1,650 feet above sea level. The
surrounding terrain is relatively flat and semimarshy, which makes it well suited for HF
propagation. Electric power enters the southern end of the facility from the town of
Hsienyang, terminating in a wall -enclosed power substation. The facility is fence secured
and occupies 261 acres.
BASIC DESCRIPTION
Physical Features
The operations area contains three multistory transmitter buildings, two antenna patch
buildings, three cooling ponds, a multistory probable control building, four support
buildings, and 25 self -supporting lattice towers (Figure 2, Table 1 and Table 2 - -items 1-
13). Each lattice tower has a crossbar mounted on top, and together, the 25 lattice towers
support 20 horizontal curtain arrays (Figure 2 and Table 1). The existence of crossb~~rs an
the top of the towers indicates that each array is made up of a front and rear curtain,
composed of stacked horizontal dipole antennas. One curtain serves as the emitter and the
other as the reflector. Horizontal distribution feeders are located on poles close to the
ground under each array. The feeders supply power to sections of the antennas and serve as
part of the phasing matrix. This type of curtain array antenna system is patterned after the
Soviet "cophasal" array and is used in facilities that serve a radio
broadcast/communications function.l
Land appendages, added to the southwestern and northwestern corners of the facility,
contain the three possible horizontal curtain arrays - -two in the southwestern area anal one
in the northwestern area (Figure 2). The southwestern array consists of three pairs of
concrete pads, each with a mast of an undetermined height. The northwestern array
consists of two concrete pads, each with two masts of an undetermined height.
A support area is contiguous to the operations area on the southern side of the facility,
and includes 33 identifiable structures (Figure 2 and Table 2, items 14-46).
Status and Activity
The Sian HF Communications Facility Hsienyang was first observed
Although the facility was probably complete on this initial otograp ~y, its
completed configuration could not be confirmed hen it appeared to be
operational. There was no discernible change in the facility at which time
ground scarring for the southwestern appendage and construction--two arge buildings and
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Table 1. Details of Curtain Arrays, Sian HF Communications
Facility, Hsienyant~ (item letters keyed to Figure 21
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PLANT YEN LIANG
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SAC. US Air Tar et Chart IL, 3d ed, Jul 68, scale 1:200,000 (SECR.ET/
1. Antennyye Ustroystva (Antenna Devices), G.A. Savitskiy, English translation of Ch. 9, 10, and 15,
Moscow, USSR, 1961.
REQUIREMENT
NPIC Project 220208
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