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SAS-2
Surveillance and measurement antenna

SAS-2 1 is an extremely broadband active receiving antenna system, developed around 1994 by Antenna Research Associates, Inc. in Beltsville (Maryland, USA), for use by the United States Central Intelligence Agency (CIA) and national and international law-enforcement agencies. The antenna is suitable for electric fields only and covers a frequency range from 100 Hz to 2 GHz.

The omnidirectional antenna system consists of a combination of a vertical monopole antenna and a discone antenna, covering two overlapping frequency bands, known as the low-band and high-band. The monopole antenna (low-band) covers 100 Hz to 200 MHz, whilst the discone (high-band) covers 30 MHz to 2 GHz (VHF/UHF).

The antenna system is known as active, which means that it contains two built-in RF amplifiers — one for each band — the output of which is available from BNC sockets on the enclosure of the pre-amplifier, at the bottom of the antenna.
  
SAS-2 antenna

The antenna is extremely useful for surveillance and monitoring purposes, but also when carrying out measurements, for example as part of a path-loss survey system, or for EMC compliance and test applications. For this reason, each SAS-2 antenna system came with an individual calibration chart. The SAS-2/A and SAS-2/B are still available from the manufacturer today (2022) [1].

  1. SAS = Surveillance Antenna System.

Inside the transport case
Radials protected by a carton tube
Complete SAS-2 antenna
SAS-2 antenna
Amplifier
Front
Rear
Manual
A
×
A
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1 / 9
A
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Inside the transport case
A
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Radials protected by a carton tube
A
4 / 9
Complete SAS-2 antenna
A
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SAS-2 antenna
A
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Amplifier
A
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Front
A
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Rear
A
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Manual

Models
  • SAS-2/A
    100 Hz - 1 GHz (single BNC output)
  • SAS-2/B
    100 Hz - 2 GHz (two N outputs)
  • SAS-2/E
    100 Hz - 2 GHz (with two outputs and rechargable batteries)
Features
The diagram below shows the layout of the SAS-2 antenna. At the bottom is the amplifier with built-in mains power supply unit (PSU). At the top of the amplifier is a rather thick black mast that ends in a discone antenna, which consists of a horizontally placed disc and a set of radials that form the approximation of a cone. This antenna covers 30 MHz to 1 GHz (or 2 GHz).

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On top of the discone antenna is another mount in which a vertical rod can be placed. The vertical rod acts as a monopole antenna that is part of a non-resonant active antenna system. At the upper end of the monopole antenna is a horizontal disc which acts as a top capacity. It extends the band coverage of the antenna. The monopole antenna covers 100 Hz to 200 MHz.

Radials protected by a carton tube
Lower part after unpacking
Upper antenna
Mount for upper antenna rod
Complete SAS-2 antenna
Mounted disc
Disc
Disc
Top capacity disc
Upper antenna rod
B
×
B
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Radials protected by a carton tube
B
2 / 10
Lower part after unpacking
B
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Upper antenna
B
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Mount for upper antenna rod
B
5 / 10
Complete SAS-2 antenna
B
6 / 10
Mounted disc
B
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Disc
B
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Disc
B
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Top capacity disc
B
10 / 10
Upper antenna rod

Specifications
  • Device
    Active monopole/discone antenna
  • Frequency
    100 Hz - 2 GHz
  • Low band
    100 Hz - 200 MHz
  • High band
    30 MHz - 2 GHz
  • Polarization
    Vertical
  • Directivity
    Omnidirectional
  • Impedance
    50Ω
  • Connector
    BNC/F
  • Overload
    0.5 V/m
  • Mains
    110-120V AC, or 220-240V AC (switchable)
  • Batteries
    Two rechargable cells (internal)
  • Current
    ~ 50 mA
  • Power
    5 Watts
  • Size
    height: 34.5", diameter: 14"
  • Weight
    9 lbs, 12 ounces
  • Temperature
    20°F - 130°F
  • Storage
    -55°F - 100°F
Documentation
  1. SAS-2B sales leaflet
    Antenna Research Associates, Inc., August 2013.

  2. SAS-2/B, Technical Manual
    Antenna Research Associates, Inc., July 1994. Issue I.
References
  1. Antenna Research Associates, Inc., SAS-2B
    Retrieved November 2017, October 2022.
Further information
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Crypto Museum. Created: Thursday 16 November 2017. Last changed: Sunday, 16 October 2022 - 09:27 CET.
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