(b) Scan functi on
Note: When ope ra ting the scan mode ob ser ve the re gu la tions
for the avia ti on ra dio ser vi ce
1 If the scan functi on is ac ti vat ed in the equip ment con fi gu ra ti-
on, pres sing the STO key chan ges from the chan nel se lec ti on
mode to the scan functi on. In the scan functi on, the fre quen cy
ap pe ars in the top line of the dis play and the as so cia ted chan-
nel with the pre set CS is shown in the bot tom line.
2 In the scan functi on, eit her all the oc cu pied sto ra ge chan nels
or a re qui red ran ge of sto ra ge chan nels can be scan ned. The
scan ning ran ge is spe ci fied in the ser vi ce mode. The va ri ous
sto ra ge chan nels are scan ned in 200 ms in ter vals. If the mi-
cro pro ces sor finds a car rier in one of the chan nels, it holds a
short on this chan nel and checks whet her an eva lua tab le
sig nal is pre sent. If no eva lua tab le sig nal is pre sent, it swit-
ches to the next chan nel and then re verts to the 400 ms in ter-
vals (mil li se conds ran ge). In the event of an eva lua tab le re-
cep ti on sig nal being re cei ved the VHF trans cei ver re mains on
the sto ra ge chan nel un til an eva lua tab le re cep ti on sig nal is no
lon ger pre sent.Af ter a hold time 0 to 60 se conds (can be set
in the ser vi ce mode) the scan ning of the sto ra ge chan nels at
200 ms in ter vals be gins again. The set squelch le vel is the
cri te ri um for an eva lua tab le re cep ti on sig nal, re gard less of
whet her the squelch is ac ti vat ed or not.
3 The VHF trans cei ver is equip ped with chan nel prio ri ty. This
functi on can be swit ched ON or OFF in ser vi ce mode SF 18
NOTE: If an ade qua te sig nal is re qui red on the prio ri ty chan nel
with op ti on chan nel prio ri ty swit ched ON, the VHF trans cei-
ver au to ma ti cal ly lea ves the SCAN mode and is rea dy for
trans mis si on and re cei ve on this chan nel. For re turn to the
SCAN mode, again press the STO key.
4 The scan functi on is ter mi na ted by pres sing the STO key. The
VHF trans cei ver then be gins to ope ra te again in the chan nel
se lec ti on mode - the CS in the bot tom line goes out and CH
ap pe ars. Exit from mode 2 is ac com plis hed in the same way
as des cri bed in the chan nel se lec ti on mode.
IN STAL LA TI ON AND OPE RA TI ON
AR 4201 - ( )
Page 3-8-
23-10-01 De cem ber 15/98
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