Technical features are subject to change without notice. AUR°EL S.p.A does not assume responsibilities for any damage caused by the device’s misuse.
AUREL S.p.A. Via Foro dei Tigli, 4 -47015 Modigliana (FC) –ITALY Rev. A, January 11th 2002
Tel.: +390546941124 –Fax: +390546941660 Pag 6of 6
50 Ohm Line (connection between antenna and pin 2):
1. It must be as shortest as possible.
2. 1,8 mm wide for 1 mm thick FR4 printed circuits and 2,9 mm wide for 1,6 mm thick FR4 printed circuits.
On the same side, it must be kept 2 mm away from the ground circuit.
3. On the opposite side a ground circuit area must be present.
Antenna connection:
1. It may be utilized as the direct connection point for the radiating whip antenna.
2. It can bear the connection of the central wire of a 50 Ωcoaxial cable. Be sure that the braid is
welded to the ground in a close point.
Antenna:
A whip antenna, 8,25 mm long and approximately 1 mm dia., brass or copper wire made, must be
connected to the RF input of the transceiver.
The antenna body must be keep as much as possible straight and it must be free from other circuits or
metal parts (5 cm minimum suggested distance.)
It can be utilized both vertically and horizontally, provided that a good ground plane surrounds the
connection point between antenna and receiver input.
N.B: As an alternative to the a.m. antenna it is possible to utilize the whip model manufactured by Aurel
(see related Data Sheet ed Application Notes).
By fitting whips too different from the described ones the CE Certification is not assured.
Other components:
1. Keep the transceiver separate from all other components of the circuit (more than 5 mm).
2. Keep particularly far away and shielded all microprocessors and their clock circuits.
3. Do not fit components around the 50 Ohm line. At least keep them at 5 mm distance.
4. If the Antenna Connection is directly used for a radiating whip connection, keep at least a 5 cm radius
free area. In case of coaxial cable connection 5 mm radius will suffice.
Reference Rules
The XTR-915 transceiver is CE certified and in particular it complies with the European Rules EN 300 220,
and EN 301 489. The equipment has been tested according to rule EN 60950 and it can be utilized inside a
special insulated housing that assures the compliance with the above-mentioned rule. The transceiver must
be supplied by a very low voltage safety source protected against short circuits
The use of the transceiver module is foreseen inside housings that assure the overcoming of the Rule EN
61000-4-2 not directly applicable to the module itself. In particular, it is at the user’ s care the insulation of
the external antenna connection, and of the antenna itself since the RF output of the receiver is not built to
directly bear the electrostatic charges foreseen by the a.m. rule.
The device use is foreseen specially for those countries where the band assigned to short range devices
(SRD) is 902–928 MHz.
