OBID
®
Installation
ID AWE 3000/6000.A-A
FEIG ELECTRONIC GmbH
Page 38 of 55
H40591-4de-ID-B.doc
E N
G
L I S H
10.3.3. Antenna supply line
The length of the antenna supply line as well as the cable type may NOT be freely chosen. Due to
their strong influence on the reading range, they have to be selected with special care. The same
applies to the layout of cables.
Please make sure that the supply line has to be suitable for both energy- and HF-signal transmis-
sion.
The place of installation determines the cable type as well as the maximum cable length:
•
For all places of installation requiring a cable length of up to 50m:
Outside telephone cable A-2Y(L)2YB2Y
with 2 dual wires and a conductor diameter of 0,8mm
(acc. to VDE 0816).
Important:
only two wires may be connected, while the rest of wires as well as the shield have
to remain blank (no grounding either).
•
Only in dry indoor rooms resp. in sealed asphalt or concrete grooves with a maximum
cable length of 10 meters:
Twisted single wires (approx. 25 turns per meter) of cable type
H07V-K1.5
with a conductor di-
ameter of 1,5mm
2
.
Further tips:
•
Even buried cable has to be protected against humidity in a tube system.
•
Protecting tubes or cable ducts must not be made of metal.
•
Utilization of the maximum admissible supply line length may lead to a reduction of the reading
range.
•
Each supply line of an OBID
®
-antenna has to have a minimum distance of 30 cm to parallel
exposed, live cables.
•
10.3.4. OBID
®
-antennas for cheque card transponder
In general, antennas for cheque card transponder are used for access control. Aligned vertical and
surface parallel, the cheque card transponder are read above the antenna. The antenna size has
to be chosen appropriate to the available space and the desired reading range. To a certain extent,
the OBID
®
-system allows you to determine this size by yourself.
When you are constructing an antenna, the inductivity has to be between 250
µ
H and 330
µ
H and
the combined resistance lower than 5
Ω
(incl. supply line). Please use enamelled copper wire with a
thickness of 0,5mm for the loop windings. The following chart lists recommended induction loop
sizes for antennas. However, the number of turns may have to be adapted in a way that the given
inductivity occurs.