solentlife
My only question as we go more digital in our gear ... is the signal state.

Let me explain .....

With DJI pushing Digital FPV and then a few guys melding analogue and digital to get an inbetween solution ... it makes me wonder .. 

We had analogue radio and we listened to the Beatles etc. as we got further from the broadcast antenna - the signal would start breaking up but still there ... but along came came DAB and now as you moved away from antenna - signal stayed clean and then ZAP ... it was gone. Literally no fade or reduction .. it was ON or OFF ... unlike analogue.

Today we have similar with our RC Tx / Rx ..... people will claim signal up and down but in fact that's what they think but is not fact. The signal is OFF .. antenna orientates - signal back on .. (RX end I'm talking about).

This is ok in LoS use as we do not get to RX limit and signal stays solid. But FPV and such can bring in a different scenario .... especially if there is no RTH failsafe.

Of course digital RC has allowed us to have FAAST ... ACCSST ... etc .... and literally put paid to the frequency board. I for one do not wish to return to that !! 
But its worth thinking about that aspect of digital ... that it is ON or OFF ..... no halfway house at all.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
Quote 2 0
Sterling101
I know having seen digital break up on satellite TV I'd rather not have that if I was relying on FPV signal as my only reference.
Like you say with analogue you get a bit of fuzziness and breakup but generally you're able to see but with a digital signal the chances are you'll lose most of the ability to see other than frozen blocks - not the ideal solution!
Whoever said nothing is impossible had obviously never tried slamming a revolving door...
Quote 2 0
Dodgy Crasher
Yep agreed, sometimes I drive about 120 miles up to the area I work from, well that was before corona virus killed all the jobs, however i mostly listen to the same channel on the radio and have done for years, now it used to work perfect for about 50 miles then I got about another 20 miles where it got progressively worse and I had to change channel.
Now I got a DAB radio in my car, so same channel it works perfect for about the same distance and then nothing for maybe a mile or 2 then it comes back on perfect for a time then same again and so on until it just stays off, it seems as you say Solent, digital there is no break up, it's all or nothing , no in between.
Quote 2 0
mastermalpass086
I remember my science teacher describing analogue as a Sine Wave while digital was binomial - like you say, either on or off.

I assumed this was why all the FPV gear out there was analogue - giving you a fuzzy video feed that warns when you are approaching the edge of your range. So I was surprised when DJI started rolling out digital and I can only assume they've worked some magic to ensure signal retention over great distances. Still, not keen on the idea of it though. But then again, were the drones that live feed to phones always digital? I didn't think phones had analogue hardware built in. Even the old Nokia bricks required headphones if you wanted to listen to the radio as they used the cable as an antenna.
BRB - Building another nosecone.
Quote 1 0
solentlife
Mobile phones were non digital for many years ...... I still have a number of them in a box ... useless now of course !
I'll fly anything if I can launch it ! Youtube : solentlifeuk
Quote 1 0
JTiger

Josh Bardwell has several YT vids where he tests DJI fpv system (all very good vids) and you definitely get visual cues tell when the signal is weak. It seems that whereas analog feed fuzzes out the digital feed gets pixelated and blurred as bitrate drops; it's like sections of the feed drop from 720p to 240p. Apparently people get unobstructed ranges up to 6-7 miles with good RSSI but the link failsafes right around that point regardless of link quality.

Quote 1 0
solentlife
Josh does some really good vids ... and in fact one of his was the prompt for my starting the thread.
I'll fly anything if I can launch it ! Youtube : solentlifeuk
Quote 2 0
JTiger
Yeah, a good source of info for FPV/quadcopter stuff
Quote 0 0