AR 3209 - ( ) - Aircraft Spruce

AR 3209 - ( )
2.5.1 Set ting the AR 3209 - (11) supply vol ta ge
The 13.75 V/27.5 V supp ly vol ta ges are set using sli de switch S4 on the back of the unit. The VHF
trans cei ver is set to 13.75 V on delivery. 13.75 V must be vi si ble on the co ver pa nel. To chan ge over to
27.5 V supp ly vol ta ge re mo ve the cover pa nel (two screws) and refit the ot her way round. This will se -
cu re ly lock the sli de switch in the cor rect po si ti on and 27.5 V will then be vi si ble in the co ver pa nel.
Fig. 2-3 Po si ti on of vol ta ge chan geo ver switch
2.5.2 Mi cro pho ne con nec ti on for a stan dard or dy na mic mi cro pho ne
Three dil swit ches are lo ca ted un der the co ver pa nel of slide switch S4 (se lec ti on of supp ly vol ta ge). Dil
swit ches 2 and 3 are to be set ac cor ding to the mi cro pho ne to be con nec ted.
Fig. 2-4 Po si ti on of dil swit ches S1 - S3 for a par ti cu lar mi cro pho ne
2.5.3 300 Ohm he adpho ne con nec ti on
If the re pla ced VHF trans cei ver had been ope ra ted with a 300 Ohm he adpho ne, the left hand dil switch
must be set to the down po si ti on (300 Ohm and AF-sym po si ti on).
Fig. 2-5 Po si ti on of dil swit ches S1 - S3 for he adpho ne connections
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