Spiral cone antenna 93490-1 200MHz to 1000MHz

Description

Spiral cone antenna
93490-1
Wideband surveillance antenna · 200 MHz - 1 GHz
93490-1
is a wideband VHF/UHF
conical log spiral antenna
, made by EATON/AILTECH/SINGER in Los Angeles (California, USA). It covers 200 MHz to 1 GHz and is intended for calibrations, EMC measurements and
surveillance purposes
. It is housed in a green/blue polyester cone enclosure.
The antenna is about one metre long and has a diameter of 35.5 cm at its widest point (i.e. the rear). It has the shape of a cone, with a flat top at the front, as shown in the image on the right.
About 1/3rd from the rear end is a mounting hole that can be used to put the antenna on a (wooden) tripod or suspend it from the ceiling. At the rear is an N-type socket that should be connected to a suitable
receiver
or
measuring device
. In many surveillance applications the antenna is used complementary to the (smaller)
23473-G2
that covers the 1 to 12 GHz range.
NOTE:
The tripod is not included
The design is based on the ETS-3101 — made by ETS-Lindgren in Austin (Texas, USA) — but is more rugged, as the semi-rigid feedline that forms an essential part of the construction, is fully covered by the enclosure, whilst on the original ETS-3101 it runs over the outside surface
[D]
.
Specifications
Model
93490-1
Dimensions
1000 x 335 mm Ø
Weight
1500 grams
Frequency
200 MHz - 1 GHz
Impedance
50 Ω
Connector
N-type (female)
Max. power
50 Watt
Peak power
100 Watt
VSWR
1.6 : 1
Pattern
Directional
Polarization
Circular (right)
The spiral cone antenna was developed by John D. Dyson in 1958, and is described in great detail in
US Patent 2,958,08
, complete with full mathematical backgrounds
[2]
. Additional information can be found on Wikipedia
[1]
. Antennas of this type can be used over a very wide frequency band and their impedance is more or less constant over the entire range. For this reason, they are extremely useful for monitoring the frequency spectrum and for other surveillance applications. Because it is circularly polarized, it can receive fields in any direction (horizontal and vertical).
Shipping is for Canada and USA (48 lower continental states).
Will ship to other country.
Buyer pays all custom fees and taxes.