Happymodel OVX303 25-300mW 5.8GHz 20x20 U.Fl
Listed as: Happymodel OVX303 25-300mW 5.8GHz 20x20 U.Fl w/ OpenVTX
Of the 81 other 5.8 GHz analog video transmitters in our database, 9 have a lower maximum power than the OVX303 25-300mW 5.8GHz 20x20 U.Fl (300 mW, 25 dBm), 1 the same and 71 a higher one; the class median is 800 mW.
| System | analog |
|---|---|
| Max power | 300 mW |
| Power levels | 0 / 25 / 100 / 300 mW |
| Frequency range | 5.8 GHz |
| Input voltage | 5V |
| Power draw | under 650 mA at 5 V (300 mW output) |
| Mounting | 16x16mm / 20x20mm / 25.5x25.5mm |
| Channels | 40 |
| Antenna connector | U.FL |
| Weight | 1.5 g |
| Price (approx.) | 19.49 USD |
Choosing between systems? See analog vs DJI vs Walksnail vs HDZero.
Where this data comes from
Corrected against Happymodel's own post, whose OVX303 block reads: Model: OVX303, Frequency: 5.8G 40CH, Transmitting Power: 0/RCE/25mw/100mw/300mw, Power supply: DC 5V, Current (5v): <650ma (300mw), Weight: 1.5gram without antenna, Center distance of mounting holes: 16mmx16mm / 20mmx20mm / 25.5mmx25.5mm. The 0.9 g this page used to show came from RaceDayQuads' listing, which also prints 'Dimensions: 15x14mm' - both are the *OVX300's* figures from the same Happymodel post ('Weight: 0.9gram without antenna', 'Standard size: 14*15*3mm'), so the listing is partly its sibling's listing. mount_mm now keeps all three patterns the manufacturer states, as the stacks do; the listing's 'Stack Size: 16x16mm, 20x20mm, 25x25mm' differs in its last entry and 25.5x25.5 is the pattern frames are sold for. power_levels_mw keeps the steps stated in milliwatts; the list also carries an 'RCE' step with no figure. power_draw is the maker's own supply figure, 'Current (5v): <650ma (300mw)' in the OVX303 block, read 2026-10-17; it is the VTX's input draw, not its RF output.