Installation Manual

Installation Manual LF RFID Interrogator HTRM1100
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froschelectronics GmbH Rev 1.2 - Feb 2021 Page 9 of 11
The terminal block fits wires from 0.5 mm² - 3.3 mm² (20 AWG - 12 AWG).
6.5 ANTENNAS
In order to comply with part 15 of the FCC and the CE regulations only magnetic loops with
an enclosed area of not more than 0.375 sqm (A<= 0.375m²) and not less than 0.004 sqm
(A>= 0.004m²) must be used and connected to the module. Only antennas which are
manufactured or certified by freaquent must be used.
The reader module HTRM1100 disposes automatic tuning of antennas. An antenna for the
HTRM1100 is a simple magnetic loop within a certain inductance. The antenna cable
inductance must be added to the loop inductance and the sum of the inductances must be in
the range given in: 7 HTRM1100 Product Specification. If the sum of inductance is within this
range the module automatically tunes the output circuitry to series resonance with a resonance
frequency close to the working frequency.
Connect the loop to the outer clamps (1 and 3) of the antenna terminal. The middle clamp (2)
of the antenna connector is foreseen to connect the cable shield wire to ground. For the case
the cable shows no shield wire, clamp 2 is not in use. Please refer to Figure 4.
Figure 4: Connecting an antenna
The antenna cable wire cross section must be in the range 0.75 mm² - 3.3 mm² (18AWG-
12AWG).