User's Manual

Radio Activity S.r.l. 31 / 44
with the branching filters. The S/N should be better than 20dB with a RF field of -110dBm @12.5KHz
of channelization.
∞ RX de-sensitivity; this measure verify the RF pollution that influences the antenna. Connect the RX
input to the antenna inserting a directional coupler. The sensitivity measured with the antenna and
substituting it with a dummy load should differ for few dB (typical value: 2-6 dB @160MHz, 1-3dB
@450MHz). If the measured value is not satisfactory, you can try to insert a band pass cavity filter.
∞ RX de-sensitivity when the TX is on; this measure verify the correct isolation of the TX/RX filter
system. Connect the antenna input to a duplex test set analyzer. The sensitivity with the TX on
respect when off, should differ for less than 3 dB (this value may vary with the TX/RX band
separation). ). If the measured value is not satisfactory, the TX/RX isolation of the branching filter
should be increased; the problem may be also in the noise of the power supply when the equipment
is in TX.
∞ Verify the IP network functionality (if the equipment is a part of a network); if the Master station is
present, a KAIROS slave should register itself to the master within 1 minute. The led “NETWORK” in
the frontal panel should blink green. Verify all the signal path: a signal received locally must arrive to
the Master (see its voter mask), must be selected in the master and must be transmitted locally. Be
sure that the signal re-transmitted is effectively the signal coming from the Master and not a local
copy.
∞ At the end remember to save on your PC all configuration parameters of the base station; these
parameters can be very useful to clone a substituting unit in case of fail.
4.10 IP discover
When KAIROS is placed in field or coming back from a site, maybe a problem to connect to it if the IP address
is unknown. A simple way to discover the IP is switching on KAIROS with the following procedure.
1. Switch off the equipment
2. At equipment switched off, press the on/off button for at least 4 sec (all Radio Led will be orange),
until the Radio Led start to flash orange slowly
3. Release the on/off button => the Radio Led start to flash green fast
4. Press again the on/off button within 4 seconds => the equipment goes in “IP discover status”
5. KAIROS performs all the setup procedure but its IP becomes: 172.33.16.140/16; during this status
the Radio Led flash orange every 2 seconds to advise that the equipment is in a maintenance status
6. Connect the setup tool to 172.33.16.140/16 address to see/change the IP currently in use in the
equipment
7. At the end of the procedure switch off the equipment pressing the on/off button for at least 2 sec as
usual
At the next power on, the equipment will assume the last IP saved.