Kenwood TR-9000 (1980–1982)
The TR-9000 is an all-mode 2-meter transceiver - FM, USB, LSB and CW - that Kenwood (Trio in some markets) built in Japan from roughly 1980 to 1982. It's a compact mobile rig: 170 × 68 × 234 mm, 2.5 kg, running on 13.8 VDC. Output is a switchable 10 W high or 1 W low on all modes. FM uses a double-conversion superheterodyne receiver (10.695 MHz first IF, 455 kHz second). SSB and CW use single conversion at 10.695 MHz. Sensitivity is quoted at 0.25 µV on both FM (12 dB SINAD) and SSB/CW (10 dB S/N). It has five memories, and memory 5 can store an odd split. RAM backup goes through a 3-pin jack. Repeater shift is ±600 kHz, and there's a 1750 Hz burst tone for European repeater access. The mic connector is a 500-ohm 6-pin locking-ring jack.
The factory manual confirms the accessory load-out: a dynamic mic with up/down switch, a mounting bracket with hardware, a fixed-station leg, DC cord with fuse, and a set of miniature plugs for standby, external speaker/key and TONE PAD. Kenwood's own documentation warns that the protective circuit will fold back transmit power if antenna SWR exceeds 1.5. It also says the internal trimmers and coils are factory-set and shouldn't be touched without proper test gear. Optional accessories listed include the BC-1 memory backup supply, BO-9 system base, MC-46 hand mic with DTMF pad, PS-20 power supply and SP-120 external speaker.
The TR-9000 has a real reputation for reliability problems, and a specific one. Owners report a recurring cluster of failures: PLL unlock (display showing only the two decimal points), a dead rotary encoder, and eventual loss of both transmit and receive. At least one owner documented the root cause as cracked solder joints where the PCB ground meets the tin shield case. Decades of thermal cycling made the shield and board expand at different rates. Reflowing those joints restored operation. Earlier symptoms include distortion on 2m sideband, soft finals, and carrier suppression / mic gain drifting high. A 1982 service bulletin addresses at least one of these. The radio needs the mod if TP3 measures below 0.5 V RMS. Anyone buying one today should inspect the shield-to-PCB solder points first.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.