Guidelines when using the radio unit FRF905 in Fronius products
• Range of validity: These guidelines have to be applied, when the concerning product is used in
countries, in which a certification of a radio unit as prescribed by FCC 47 C.F.R. § 15.247, is accepted for its use. All mentioned points have to be fulfilled.
• Only the layouts with the belonging equipments, used in the radio device certification, may be
used.
• Usable frequencies: 902,4-927,6 MHz in the 0,4 MHz-scheme. At least 50 different frequencies
must be used here, after a pseudo random principle, whereby each frequency may be used
within any 20s-intervals for maximum 0,4s.
• useable antennas:
o internal antenna ANT-916-JJB-ST
o external antennas over SMA-plugs: ANT-DB1-RMT-SMA-2mRG174 or PSKN3-890S
• The following transmitting powers with the corresponding time on air and antennas have to be
kept:
Antenna
maximum transmitting power [dBm]
TOA each 100ms
1
[%]
10 50
PSKN3-890S
6 100
ANT-DB1-RMTSMA-2mRG174
10 100
ANT-916-JJB-ST 10 100
• The supply voltage must be within the range of 1,9 – 3,6 V (at minimum 30mA load capacity)
• In the case of the use of an external antenna, the antenna plug may not be accessible from the
outside (plug rises up from the equipment). If this is nevertheless absolutely necessary, an RPSMA antenna plug (“unique antenna connector”) must be used. Accordingly the plug of the antenna, which can be attached (ANT-DB1-RMT-SMA-2mRG174 and/or PSKN3-890S), has also to
be changed.
• The inscription „Contains FCC ID: QKWFRF905“ has to be attached readably from the outside
(and/or in a general manner) on the product
Reference:
[1] Data sheet of transceiver nRF905 V1.2 (download: http://www.nordicsemi.no
1
The TOA (time on air) is to be calculated as prescribed by [1] page 25. Measurement: Low-Hi-transition
)
of the signal TX_EN to the Hi-Low-transition of the signal DR of the nRF905.
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