Adding a fan to keep an older mobile transceiver cool is easy to do with ready made parts.
Category: 2-meters
The FTM-500DR is the first mobile rig with a built in speaker in the remote head and with a microphone jack in the head and body. This makes for an easy installation.
Connecting multiple rigs to a single tri-band antenna can be done using duplexers and/or triplexers. I’ve connected my FT-991A and TH-9000D to my CX-333 triband base antenna.
A modified SP-10 external speaker for the FT-991A dramatically improved RX audio quality, a huge improvement over the built in top-firing speaker.
The Radio Shack / Realistic HTX-202 and HTX-404 are solid HTs that survived over time with minor maintenance items such as the internal battery and the high low power switch.