The TKM MX 300 Nav/Comm is designed to replace the RT 328T, RT 308C, RT 328T, RT 328A, RT 528A, RT 328C, RT 528E, RT 328D, and RT 508A. The MX 300 is available in the black face plate shown left or in a beige face plate to match many Cessna panels. The MX 300 operates on 13.75 vdc w/7 Adc max current in transmit.
Note: We do not offer 8130 forms on these units.
Easy to use. Easy to install. Works well. Great alternative to invasive avionics install.
TKM MX 300 NAV/COM BLACK COVER
I’ve had an MX300 as my #2 NAV/Com since 2011–as long as I’ve owned my airplane. I recently had to send it out for repairs. Cost was $650 for repairs, plus labor for the local avionics to remove, ship and re-install. Still a lot cheaper than buying a new or used Nav/Com unit to replace it.
I have owned two MX300 and two more of their other model which replaced Narco units. The radio is a good solid performer. I have had great luck in the past. HOWEVER, I understand TKM has been sold to a new owner. I see a 50% increase in the prices of radios, parts, and repairs.
I have 2 of these units. I had 5 repairs over the years. All repairs must be done by the TKM factory - no one else repairs these radios. Now TKM factory tells me they wont repair either radio because they are too old. They consider any radio older than 20 years old to be obsolete. They have chosen to not support 70% of the products they have sold.
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.
The TKM MX 300 Nav/Comm is designed to replace the RT 328T, RT 308C, RT 328T, RT 328A, RT 528A, RT 328C, RT 528E, RT 328D, and RT 508A.
This is a 14 volt radio and will require a converter to work with your system.
Per the owner's manual: The NAV receiver provides frequency selection for remote mounted Distance Measuring Equipment and Glide slope Receivers.