Ortovox F1 Focus Manual page 7

TRANSMITTING AND RECEIVING CONTROL
E
If the light doesn't begin to flash even though new batteries
1
have been inserted, the 457kHz transmitter must be
defective. Please send your device directly to an ORTOVOX
service center.
Once turned on, a short transmitting signal can be heard
2
after switching the beam into receiving mode. Then the typi-
cal receiver rustle follows. Its volume is controlled by the
volume control switch. Turning the switch clockwise decrea-
ses it, i.e. from a higher to a lower search zone. In this
manner, the function of the amplifier and the loudspeaker is
tested as well. No signal will be heard, however, if the
switch is already in the receiving mode when it is turned on.
3 The function of the earphone can be tested in the same way.
NOTE:
Earphones are sensitive to high temperatures. At temperatures of more than
+ 45° C, its crystal may be damaged (loss in function or total failure). Do not expose
your earphone to the sun!
The maximum transmitting and receiving range can be checked as follows:
Please put the transmitting F1 focus horizontally on the snow surface
• Go away from the transmitter for about 100 m
• Turn your F1 focus on receive mode and approach the transmitting transceiver.
• The antennae of both avalanche transceivers are coaxial
(the antennae have the same axis)
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• You receive the first audio signal at a distance between 90 and 80 m,
at a distance of 40 m the first visual signal appears
• Then exchange your transmitting F1 focus with the receiving avalanche transceiver
3
and repeat the procedure.
For ski tours, snowboarding and off-pist skiing we recommend the
2 "daily function control":
• All members put their F1 focus on receive mode at the same time
• One member (preferably the group leader) puts his ORTOVOX avalanche
transceiver on transmit mode
• If all the members receive acoustic and visual signals, the receiver and
the transmitter are working correctly.
• After having checked the transmitter you have to test the function of the receiver
1
• The members put their avalanche transceivers on transmit mode and pass the
receiver one by one and at a distance of about 15 m.
Search strip width:
Up to now the search strip width is defined as 40 % of the maximum range. This
means for the ORTOVOX avalanche transceivers: maximum range of about 80 m x 40 %
= 32 m search strip width. The avalanche transceivers working only with the digital
technique do not allow large ranges as the ORTOVOX avalanche transceivers offer.
This is the reason why efforts are made at the moment (8/2000) to change the
definition of the search strip width.
The proposal is: 50 % of the maximum range = half search strip width
This means: search strip width = maximum range.
ORTOVOX takes this way for dangerous. For your own safety we recommend
a search strip width of 60 m for our avalanche transceivers.
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