FIXED COMMUNICATIONS STATIONS, NORTH VIETNAM

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78T05161A000100010049-5
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 15
• Document Creation Date: December 28, 2016
• Document Release Date: April 7, 2003
• Sequence Number: 49
• Publication Date: November 1, 1964
• Content Type: IR

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November 1964 Copy
CIA/PIR-35/64
CENTRAL INTELLIGENCE AGENCY
PHOTOGRAPHIC INTELLIGENCE REPORT
NORTH VIETNAM
FIXED COMMUNICATIONS STATIONS,
DECLASS REVIEW by NIMA/DOD
TOP SECRET
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E.cI ded f.om a~romarc
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FIXED COMMUNICATIONS STATIONS,
NORTH VIETNAM
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A search of photography of North Vietnam
covering the period from
0 has revealed the presence of one
large point-to-point transmitting` station, one
large international receiving station, one large
international broadcasting station, and 3 small
point-to-point communications stations (Figure
1). This report locates and describes these
stations, and furnishes pertinent mensural and
technical data for each.
1
02? 10
4? 10
6? 108?
C H I N A
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Broadcas
ing Mon Cay Station
D
ien Bien Phu (p
Station ` Dien Bien Phu
Statio
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Transmitting
Station
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L A 0 S
Thanh Hoa
NORTH
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OF
VIETNAM
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Dong Hoi Station
THAILAND
Dong
oi OEMARCATIO
LINE
Railroad
Road
1l
?-- S
UTH
50 100
VI
TNAM
NAUTICAL MILES
FIGURE 1. LOCATION MAP.
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HANOI POINT-TO-POINT
TRANSMITTING STATION 105-46E. Two separate walled areas at the
A large point-to-point high-frequency (HF) station are a control area and a support area.
transmitting station (Figures 2 and 3) is situated The control area contains a transmitter build-
approximately 5.7 nautical miles (nm) south- ing, 2 cooling ponds, and 7 other buildings.
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_W_
SUPPORT AREA
. Stick mast
O Rhombic antenna
--- Dissipation line
Road
-w- Wall
-?- Power line
? Guard tower
Drawn from oblique photography: scale varies
N
I
The support area contains approximately 13 antenna, 2 medium-sized single rhombic an-
administration and housing-type buildings. Sur- tennas arranged as a pair, 2 medium-sized
rounding these areas are 2 large and 2 small single rhombic antennas, and approximately 27
double rhombic antennas arranged as pairs scattered stick masts. Pertinent mensural and
for day-night operations, one double rhombic technical data are given in Table 1 .
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Yards at 21-03N 105-41E. The absence of
cooling ponds and the presence of the large
Hanoi point-to-point transmitting station indi-
A large point-to-point receiving station cate that this is most probably a receiving
(Figures 4 and 5) is situated approximately 8.6 station. It has a walled area that contains a
nm west-northwest of the Hanoi Marshaling control building and approximately 17 other
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? Stick mast
Q Rhombic antenna
Road
-W- Wall
-? - Powerline
Guard tower
housing and related buildings. Antennas are and 4 single rhombics. The antennas are dis-
arranged in a roughly circular pattern surround- persed for diversity reception. In addition,
ing the walled area, and include 3 large and 3 there are at least 14 stick masts scattered
small double rhombics arranged in pairs for throughout the area. Pertinent mensural and
day-night operations, 2 other double rhombics, technical data are given in Table 2.
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HANOI-ME TRI INTERNATIONAL
BROADCASTING STATION 105-47E. The station contains two large
A large HF radio station (Figures 6 self-supporting lattice towers, each with a
and 7), used for international broadcasting, 55-foot crossboom on top, supporting the
is situated approximately 4.3 nm southwest director-reflector curtains of a horizontal cur-
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Stick mast
Rhombic antenna
Dissipation line
Road
Fence
Power l ine
Ditch
Concrete slab
Guard tower
TRANSMITTER
ISO
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tain array. The station also contains 3 large scattered throughout the antenna area. Support
and 3 small double rhombic antennas arranged facilities located within a large fenced area in-
as pairs for day-night operations. Pertinent clude a transmitter building, a cooling pond,
mensural and technical data are given in Table 3. and 8 other buildings; over 20 other buildings
In addition, approximately 10 stick masts are are in an adjacent, partially fenced area.
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COOLING
POND
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PROBABLE HORIZONTAL
DIPOLE ANTENNAS
Pole mast
Road
Fence
----- Cable scar
Drown from oblique photography: scale varies
DONG HOI POINT-TO-POINT
COMMUNICATIONS STATION
A small HF point-to-point communications
station (Figure 8) is situated approximately 4 nm
north-northeast of Dong Hoi at 17-32N 106-35E.
The station consists of a fenced area, 6 control/
support buildings, and, immediately north-north-
west, 4 pole masts that probably support two hor-
izontal dipole antennas. Each probable antenna
has a 145-foot mast separation and is oriented
on an azimuth of A fenced area
of unidentified activity is approximately 3,500
feet to the east-northeast and is connected to
the station by road and by cable scar.
DIEN BIEN PHU POINT-TO-POINT
COMMUNICATIONS STATION
A small point-to-point communications sta-
tion (not illustrated) is situated approximately
3.3 nm south-southwest of Dien Bien Phu Air-
field at 21-22N 103-OOE. This station has the
same general layout and size and almost iden-
tical components as the Dong Hoi station, and
for this reason is not covered in greater detail.
The two probable antennas are oriented on an
MON CAY POINT-TO-POINT
COMMUNICATIONS STATION
A small point-to-point communications sta-
tion (not illustrated) is situated approximately
one nm southeast of the center of Mon Cay at
21-32N 107-59E. The general layout, size,
and components are essentially the same as at
the Dong Hoi station. The two probable antennas
are oriented on an azimuth of
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projection in order to illustrate their general
The azimuths of the antennas at the three orientation (Figure 9); because of the numerous
Hanoi area stations, as listed in the pertinent technical limitations involved, these projections
tables, have been plotted on their great-circle should be considered only as approximations.
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Major
Axis
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Major
Axis
Tilt
Angle**
(0 1)
Azimuth
(1)
1 Single 605 290
rhombic
2 Single
rhombic 600 290
70 75
Bombay, India
3 Double
rhombic 610 295
85 100
New Delhi, India
4 Double
rhombic 730 345
100 115
Alma-Ata, USSR
5 Double
rhombic 435 210
65 120
Alma-Ata, USSR
6 Double
rhombic 850 405
110 135
Alma-Ata, USSR
7 Double
rhombic 490 235
80 110
Alma-Ata, USSR
8 Single
rhombic 540 340
80 90
Karaganda, USSR
9 Single
rhombic 540 340
70 85
Karaganda, USSR
obliquity of photography
*All measurements are very approximate because of extreme difficulty in locating exact position of masts and
Antenna
Length (ft)
Mast Height (ft)
Tilt
th
A
i
Major
Minor
One
Major
Minor
Angle**
z
mu
(,)
General Orientation
No
Type
Axis
Axis
Side**
Axis
Axis
(? ~l
Double
rhombic 435
Minor
Axis
One
Side**
rhombic 730 343
3 Single
rhombic 600 295
4 Double
rhombic 615 305
5 Double
rhombic 425 200
6 Double
rhombic 730 360
7 Double
rhombic 610 285
8 Double
rhombic .490 235
9 Double
rhombic 850 400
10 Single
rhombic 600 290
11 Single
rhombic 610 295
12 Single
rhombic 600 290
Minor
Axis
IA-RDP78TO4
*All measurements are very approximate because of extreme difficulty in
obliquity of photography
**Computed measurement
***Measurement precluded by photographic limitations
Alma-Ata, USSR
Alma-Ata, USSR
Bombay, India
New Delhi, India
Alma-Ata, USSR
Alma-Ata, USSR
New Delhi, India
Alma-Ata, USSR
Alma-Ata, USSR
New Delhi, India
Djakarta, Indonesia
Peiping, China
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Minor
Axis
Major
Axis
Length (ft)
Curtain array
Double rhombic
Double rhombic
Double rhombic
Double rhombic
Double rhombic
Double rhombic
480
330
415
300
360
520
One
Side**
Tilt
Angle**
(o ')
I
Azimuth
(O)
Tower separation: 415 eet, tower height:
240
175
240
190
210
250
*All measurements are very approximate because of extreme difficulty in locating exact position of masts and
obliquity of photography
**Computed measurement
Hanoi Area Stations
CNO. US Air Target Chart, Series 200, Sheet 0616-19A, 1st ed, Jul 59, scale 1:200,000 (SECRET)
Dong Hoi
DIA. US Air Target Chart, Series 200, Sheet 0617-19HL, 2d ed, Jan 64, scale 1:200,000 (SECRET)
Dien Bien Phu
DIA. US Air Target Chart, Series 200, Sheet 0616-17HL, 2d ed, Sep 63, scale 1:200,000 (SECRET)
Mon Cay
USAF. US Air Target Chart, Series 200, Sheet S0615-16A, 1st ed, Jul 59, scale 1:200,000 (SECRET)
REQUIREMENT
CIA. C-DI-4-81,221
PROJECT
C-1253/64
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Alma-Ata Area, USSR
Alma-Ata Area, USSR
Peiping, China
Peiping, China
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