This unit was recently removed for an avionicsupgrade. Sale includes radio, tray, backplate and indicator.
From the Owners manual:
The unit features digital (LED) displays for active(yellow) frequency channel and standby
(red) frequency channel for both COMM and NAV.
For channel selection a MHz knob and a KHz knob areprovided. For 25 KHz increments in
COMM, a 25 KHz button is provided. To activate COMMor NAV frequency selection, an
N/C button is provided; a \"tic\" appears inthe selected standby channel display.
Channel selection operates on the standby channelonly. When the desired channel is indicated
in the standby display it may be placed into theactive position by depressing the
\"Flip-flop\" button located to the left ofthe displays (labeled COMM and NAV) the active
channel is then placed into the standby position.
The NAV receiver features a AC/ID button to permitselection of voice or ident reception. In
the Ident condition a \"tic\" is displayedon the active NAV channel display.
The COMM transceiver features a test button whichoverrides the squelch to verify proper
receiver operation and to allow reception of weaksignals. Also provided on the active
COMM display, is a \"tic\" to indicatetransmitter power output.
A VOR test button is provided on the front panel toinject a 0 degree FROM bearing into the
Navigation converter circuits when a solid VORsignal is being received; a bearing adjustment
can then be made through the adjustment hole by theKHz switch.
The adjustment hole by the MHz switch permitsoperator adjustment of the display dimmer
range for optimum nighttime brightness.
The MX-300 is the TKM radio designed as a slide-inreplacement for a variety of 14 volt ARC radios. The most common replacementsare the following radios:
- ARC RT-328D
- ARC RT-328T
- ARC RT-528E
These are the most common indicators used in MX-300installations (the same as with an RT-328T installation):
For VOR/LOC installations:
- IN-514R VOR/LOC Indicator
- IN-514B VOR/LOC Indicator (with backcourse light)
