Bulletin:  AL5130
Vendor:    Alinco
Subject:   Extend RX/TX range and aircraft band with AM detector


The new Alinco DR-600 dual bander has a few modifications that may be
of interest to the ham community.  I performed the modification to my
radio without any problems.  The modifications include:

1) Receive the aircraft band with an AM detector tuning 108-142MHZ
2) Extended receive and transmit range on both bands.
3) Enable 800MHZ receive.

Open Up AM Aircraft Band And Extend RX/TX Range
==============================================
A) To perform the first 2 modifications, remove the front panel from the
   radio by removing the 4 screws, there are two on each side of the
   radio along the front edge.
B) Unplug the control head from the main radio.  Remove the two screws
   holding the rear cover on the control head and pop off the rear cover.
C) Looking at the PC board you will see a red and green jumpers in the
   center of the board.  Remove both jumpers.
D) Reassemble the radio and reset the microprocessor.  To reset the radio
   turn OFF the radio, now push and hold the FUNCTION key and turn ON
   the radio.
E) The extended range both transmit and receive on VHF is 130-172MHZ and
   UHF is 400 to 519MHZ.
F) To access the AM aircraft band push the VHF button to select that
   band and then press the VHF button a second time. The radio will
   display "AM" next to the frequency readout and tune 108 to 142MHZ.
H) To access the 800MHZ band press the UHF button to select that band
   and then press the UHF button again to switch between the 70cm band
   and the 800 MHZ band.  At this point the 800MHZ band will receive but
   does not have an antenna connected to it, so in order to use this band
   the modification below is necessary.

   **** Refer to Bulletin AL5140 for details on instaling the 800MHZ
        antenna input and connector.

REMEMBER:  These modification are to be preformed at your own risk.
           This rig is very compact and probaby won't give you a
           second chance if you screw up. SO BE CAREFUL.

Good Luck  /  73 de Ron  WB4HFN@KB4N.NH