1 Use s
Due to its small size and low weight, the Active Directional
Antenna HE 100 in conjunction with a compact, portable receiver
(e.g. EB 100) is ideally suited for tracing signal sources and
sources of interference.
The direction of the signal source is found by pointing the an
tenna towards the direction of maximum signal voltage. The
overall frequency range from 20 to 1000 MHz is covered by three
exchangeable antenna modules, which handle both vertically and
horizontally polarized signals and have almost identical cardioid
radiation patterns in both planes.
In order to increase the sensitivity, a low-noise amplifier can
be switched into circuit (active/passive switchover). As this
amplifier is bypassed during passive operation, the HE 100 can
also be used in the vicinity of powerful transmitters.
Camouflaged use of the antenna, for instance in a suitcase or a
travelling bag, is also possible.
2 Description .
The broadband, cardioid directional pattern of the HE 100 is
obtained by using loaded loop antenna modules of different size
for the three subranges of 20 to 200 MHz, 200 to 500 MHz and 500
to 1000 MHz. These RF modules can be plugged on to a handle,
which contains the following:
- Power supply, which comes from a set of four round cells R6
(dry or NiCd cells) contained in a removable battery holder.
- Antenna electronics, comprising RF amplifier, active/passive
switch and circuitry for the meter.
In the active mode, the RF signal path is taken via an RF relay
(when supply voltage is switched on) to the low-noise amplifier,
which is bypassed in the passive mode.
- Meter, which indicates the strength of the incoming signal. The
pointer deflection is controlled by the receiver via the RF
cable. The meter, which can be illuminated, also indicates the
state of the batteries at the push of a button.
H E 1 0 0 R 4 4 4 1 1 - 3 R O H D E & S C H W A R Z
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