Hi there,
Just recorded my first flight on a Quad with Camera + OSD on board. Seem to be getting a sh*t load of interference and trying to work out what I should expect before I start trying to improve it.
My gear is:
- ImmersionRC 600mW 5.8Ghz TX
- ImmersionRC 5.8Ghz UNO RX
- standard out of box antenna
- MiniOSD
- APM2
- EasyCapture USB dongle + Acer Aspire Netbook for video recording (Fatsharks are on backorder)
Have attached the following video. To me it seems to have a lot of interference... The RX was ~ 50m away on the dashboard of my car.
Thoughts? suggestions?
Replies
As previously mentioned, make, or buy, a pair of circularly polarized antennas. They will reduce your multipathing down to almost nothing. Also get your receiver antenna up high, 1m high or more is ok, 2 is better.
Have a quick read about the Fresnel zone. I'll attach a Freznel zone spreadsheet I made so you can quickly get an idea of it's size. make sure the zone is clear of objects, especially metal ones like your car. :)
Freznel Zone Calculator.xlsx
Righto. Wasn't as much rain around... so got out again today and took the receiver with me this time.
Seems much clearer until it gets about 50m or so up and then the interference starts again (at about 4.30 mins). Is it better to have the antenna facing downwards or sidewise for flying above?
Probably should add that I'm in the middle of a city (Sydney)... so there is also likely a lot of other noise in the air also. Off to the country on the weekend, so looking forward to trying out the gear there.
Mmm... youtube didn't seem to embed correctly... also... I think the 'ghosting' is from the cheapo USB recorder
https://www.youtube.com/watch?v=ncACKNpp_Do