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Transmitting Antennas at NRS(T) Battle Point
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Great Video -
Virtual tour of reconstructed site
Antenna field map
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Receiver Site Antennas at NAVCOMMSTA Greece
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The Receiving Central antenna
locations are shown in figure 2-1. The antenna field is divided into four
90-degree sectors that are joined at approximately the center of the
Receiving Central complex.
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The antennas, except for the two
Fixed Log-Periodic and four Rhombics, are designated by a sector number,
an abbreviation indicating the type of antenna, and the number of that
type. For example, 1LP2 identifies Rotatable Log-Periodic antenna number 2
that is located in sector 1. The fixed Log-Periodic antennas are
designated FLP1 and FLP2, the single Rhombics are RN1 and RN2, and the
Dual-Nested Rhombics are RA1/2 and RS1/2
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a. Six Rotatable Log-Periodic, 6.5
to 60 megacycles, type 237-1A.
b. Two Fixed Log-Periodic, 2.5 to 32 megacycles, type 726-1.
c. Eleven 3-wire Vertical Folded Doublet, 6 to 32 megacycles, type
FDA-3-600R.
d. One Conical Monopole, 2 to 8 megacycles, type OCM-68.
e. One Conical Monopole, 4 to 16 megacycles, type OCM-28.
f. One Conical Monopole, 7 to 28 megacycles, type OCM-17.
g. Two Dual-Nested Rhombic.
h. Two Single Rhombic.
i. Two Low-Frequency Long-Wire, one 600-foot and one 700-foot, type RLW.
j. One VHF, 100 to 174 megacycles, type F-11.
k. One UHF, 225 to 400 megacycles, type AT-197.
l. One UHF, 225 to 400 megacycles, type AT-150.
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Transmitter Site Antennas at NAVCOMMSTA Greece
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A detailed plot plan of the Transmitting
Central antenna field is illustrated in figure 2-1. Antennas installed at
the Transmitting Central include the following types and quantities:
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a. Ten Rotatable Log-Periodic, 6.5 to 60 megacycles, type 237A-1A.
b. Ten Conical Monopole, 2 to 8 megacycles, type OCM-68.
c. Eight Conical Monopole, 4 to 16 megacycles, type OCM-28.
d. Ten Conical Monopole, 7 to 28 megacycles, type OCM-17.
e. One Conical Monopole, Tuned, 4 to 30 megacycles, type 775.
f. Fourteen 3-Wire Vertical Doublet, 6 to 32 megacycles, type FDA-3-600R.
g. Two Low-Frequency Longwire, 417-foot and 917-foot, type TLW.
h. Six Dual Nested Rhombic.
i. Two Single Rhombic.
j. One Pan Polar Low-Frequency Tower, 630-foot.
k. One Low-Frequency Tower, 353-foot.
1. One UHF, 225 to 400 megacycles, type AT-50
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Antenna Lead Switching System
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Barrigada Guam 1956 - "6-10" Type switch-yard #4
looking east
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Barrigada Guam 1956 - "6-10" Type switch-yard #4 from pivot-pole
side
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Barrigada Guam 1956 - "6-10" Type
switch-yard #4 looking south
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Switchyards around transmitter building- Barrigada Guam
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Barrigada Guam
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Barrigada Guam
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Typical Receiver Site Antenna Layout
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Rhombic
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3-Wire Rhombic
Nested Rhombic
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Quadrant
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| Wire Antennas - Also see USMC Field Antenna
Handbook - download 4 MB
pdf (thanks to C Anderson) |
| 600 Ohm Terminator for Rhombic
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Conical Monopole Antenna -
The conical monopole antenna is used in
HF communications. It is a broadband, vertically polarized,
compact omnidirectional antenna. This antenna
is adaptable to ship-to-shore, broadcast, and ground-to-air
communications. It is used both ashore and
aboard ship. When operating at
frequencies near the lower limit of
the HF band, the conical radiates in much the same manner
as a regular vertical antenna. At the higher frequencies,
the lower cone section radiates, and the top section
pushes the signal out at a low angle as a sky wave.
This low angle of radiation causes the sky wave to
return to the Earth at great distances from the antenna. Therefore,
this antenna is well suited for long-distance communications
in the HF band.
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Conical Monopole
AS-2205/FRC (7-28 mc)
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Conical Monopole
Hy-Gain 2012AA (3-30 mc)
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Conical Monopole
Hy-Gain 2012AA details
"Performance Evaluation of Conical Monopole" - Dec. 1992 NPS
Thesis (download 2.6 MB pdf)
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Conical Monopole -Hy-Gain 2012AA - Kato Souli Greece
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| Inverted Cone Antenna - The
inverted cone antenna is vertically
polarized, omnidirectional, and very broadbanded.
It is used for HF communications in ship-to-shore, broadcast, and
ground-to-air applications. The radial
ground plane that forms the ground system for
inverted cones is typical of the requirement for vertically
polarized, ground-mounted antennas. The radial
wires are one-quarter-wavelength long at the lowest
designed frequency.
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Inverted Cone
AS-2212/FRC (2-30 mc)
AS-2213/FRC (2.5-30 mc)
AS-2214/FRC (3-32 mc)
Inverted Cone - Kato Souli Greece
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Feed Point
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Inverted Cone (Kato Souli)
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Elevated Discone
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| Granger
3005 Spira-Cone
Data
Sheets |
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NRTF Niscemi
----photo
info---- |
| Sleeve Antenna - The
sleeve antenna is used primarily as a receiving antenna.
It is a broadband, vertically polarized, omnidirectional
antenna. Its primary uses are in broadcast,
ship-to-shore, and ground-to-air communications.
Although originally developed for shore
stations, there is a modified version for shipboard use.
Photos below show a sleeve antenna for shore stations.
Sleeve antennas are especially helpful in
reducing the total number of
conventional narrowband antennas that
otherwise would be required to meet the requirements
of shore stations. With the use of multicouplers,
one sleeve antenna can serve several receivers
operating over a wide range of frequencies. This
feature also makes the sleeve antenna ideal for small
antenna sites. When used for transmitting, sleeve antennas can typically
handle 30kw with less than 3:1 VSWR over a 3:1 frequency range |
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Sleeve Antenna at NPG - this has two wire-spreaders in the
vertical section
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Sleeve Antenna at NPG
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NAVRADSTA (T) Barigada Guam - Sleeve Antenna #2007 RF
Transformer and Styroflex Cable Attachment
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Sleeve Antenna dimensions
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Sleeve Antenna dimensions
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Sleeve Antenna with reflector and director
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Fixed Log Periodics
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Vertical Fixed Log Periodics
Sector Vertical Log Periodic
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Horizontal Fixed Log Periodic
(Kato Souli)
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Rotatable Log Periodic - North West Cape
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Rotatable Log Periodic
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Rotatable Log Periodic
- NGE Nea Makri Greece
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AS-3482 Rotatable Log Periodic
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Rotatable Log Periodic - NQM Midway
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Rotatable Log Periodic
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Rotatable Log Periodic
- NGR Nea Makri Greece
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Rotatable Log Periodic - Barrigada Guam
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AN/FRA-109
(similar to AN/FRA-107)
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4-30 mc, 600kw PEP transmitting antenna system -
steerable beam or omnidirectional
FRA-109 Monopole
FRA-109 reflector
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Kato Souli Greece
FRA-109 at NRTF Dixon CA
FRA-109 at NRTF Dixon CA
FRA-109 at Asmara Tract H
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Kato Souli Greece
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CDAA Receiving Antenna Systems
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| AN/FRD-10
AN/FRD-10 CDAA page
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Mainly used for NAVSECGRU DF/Intercept - but several were also used for
COMMSTA general service communications |
CDAA Components
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AN/TRA-40 CDAA
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AS-768/GR 225-400MHz
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225-400 MHz antennas
AT-150/SRC coaxial dipole
AS-390/SRC stub dipole
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AS-1018/URC collinear dipole
AT-150/SRC coaxial dipole
AS-390/SRC - info
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Typical Installation
AS-1018/URC
NT-66095 (vertical dipole)
AS-768/GR
Typical Site Layout
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