Atec Rohde-Schwarz-EB500 - Manual (Page 14)

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Fast, reliable direction finding due to high
DF ­accuracy
In the VHF/UHF range the R&S®EB500 with its direction
finding function uses the correlative interferometer
DF method. In contrast to simple amplitude comparison
methods, the instrument therefore offers significantly
higher, class A/B DF accuracy in line with ITU SMH 2002.
This high DF accuracy relies on the precise measurement
of the phase angles between the reference antenna ele­
ment and the other elements. Measuring the phase differ­
ence between two signals normally requires two coherent
receive paths. For this reason, most interferometer direc­
tion finders on the market use at least two receivers. In the
R&S®EB500, the two receive paths are coherently linked
in the DF antenna using a patented method. As a result,
there is no need for a second interception processing
channel that is customarily found in interferometer direc­
tion finders.
In the HF range, the Watson­Watt direction finding
method is used. The special advantage of this method is
that small DF antennas can be deployed. Accordingly, the
R&S®EB500 with its DF function is also very suitable for
mobile direction finding in this frequency range.
Direction finding up to 6 GHz
Together with the R&S®EB500­SHF option and the
R&S®ADD075 UHF/SHF DF antenna, the R&S®EB500 de­
livers precise DF results up to 6 GHz. The compact instru­
ment thus takes highly accurate bearings of signals above
3 GHz such as:
❙WLAN
❙WiMAX™
❙Microwave links
The DF function of the R&S®EB500 fully corresponds
to that of the R&S®DDF205 digital direction finder
(product brochure: PD 5214.3723.12, data sheet:
PD 5214.3723.22).
Precise direction
finding of emissions
(with R&S®EB500-
DF direction finder
upgrade kit)
Display of DF results.