MTR-3B vs. SW-3B seems to be a popular topic. I’ve summarized in the table below the main differences between the two. Each radio has unique features, so the bottom line is that there is no clear winner.
EDIT: Updates based on feedback below.
| Model | MTR-3B | SW-3B |
|---|---|---|
| Manufacturer | LNR Precision | Venus Information Technology |
| Price | 299.99 USD | 188 USD |
| Bands | 40/30/20 | 40/30/20 |
| Size | 96x64x25mm | 104x71x25mm (+15mm protuding knobs) |
| Weight | 125g | 180g |
| RX/TX current | 20/700mA | 40/800mA |
| Control | Buttons - no protuding knobs | Knobs |
| RF gain control | None | Yes |
| Audio output | Fixed to 420mV rms with ALC | Adjustable |
| Clock | Yes - on digital display | None |
| Frequency memories | 1 starting freq. per band | 8 per band |
| Code memories | 3 memories, 63 chars each, allowing CQ SOTA | Callsign memory for CQ - no CQ SOTA possible |
| SSB RX | No | Yes - cross mode possible |
| Tuning | Via menu | By turning off/on and simulating straight key |
| Keyer speed change | Via buttons w/ screen display feedback | Via key w/ audible feedback |
| Code visual feedback | Yes - on digital display | None |
| S-Meter | No | Yes |
| Supply | 6 to 12V | 8 to 15V |