User guide
AVALON RF, INC.    Page 19 of 28 
DX404/DX504/DX604 User’s Guide & Operating Manual 
5.2  Optional features:  
Option 00  European version. 
  Includes a 230VAC power adapter and calibration 
  for PAL. 
Option 01  Remote programming. 
  The RS232 interface is installed on the 
  power input connector. Consult Appendix B for 
  programming instructions. 
Option 02  Remote synthesizing (DX604 only) 
  This option automatically changes the operating 
  frequency of a TX630 companion transmitter to 
  match the change in tuning frequency of its DX604. 
  It requires Option 11. 
Option 03  Dual IF bandwidth (DX504 only) 
  IF bandwidth of 16MHz and 27MHz 
Option 04  Extended tuning range 
  900 MHz – 2.15 GHz (DX504) 
    2.150GHz to 2.500GHz (DX604) 
Option 11  Two way serial communication channel. 
Option 31  Audio talk back 
  Does not work in conjunction with option 11 
Option 41  Alarm output 
Option 51  Telemetry output. 
Option 99  Power to an external LNA (DX504 only) 
Option R  Rack mount adapter (requires two receivers). 










