@Banme_RCHaha, it is imposible as I said at that range bitrate was about 1000 kbps, I dont know at this level can be called HD?
I am confused by ur this statement. You said “impossible”, I don’t understand. What was the video quality at the far end of the range, that is after about 10km to 17km? at 1000kbs there was lag in HD link? or the HD link became non-HD link ? or there was noise in the video (that i doubt would occur in digital video system)
Also plz share your antenna placement/position. I hope u used stock antennas?
Haha. You are researching the infos well.
How I can describe the image quanlity of herelink! Let watch my above picture again, I took it at 12,5 km range and in fact I can see more clearly than that picture.
As you know when further you fly, the signal decreases, but at the end of trip, I see that the bitrate was about 1000 kbps and i still see quite clearly. But it is not HD quanlity at that range, or I maybe dont understand what HD standard is?
And at the fargest of range, video streaming was still STABLE, NO LAG! very nice!
Antennas is almost stock like my way of thinking, lol
Will show antennas later!
As I promise! Here is how I place my antennas on the plane! One is far 30 cm from all electronic components. Air unit is placed outside for cooling, it is just under 40 degree C when in the air.
@philip
I have few questions:
1- The HereLink user has choice to select between FCC and CE mode? Or is it automatically selected based on the built-in gps which automatically selects either FCC or CE based on the rules for that particular country/Location?
2-what is the RF power of both the airunit and the ground unit in milliwatta or in dBm?
It’s from Philip as this has already been asked before for a commercial client I have, I don’t just make this stuff up you know .
If you want precise it’s between 28.db and 28.28db depending on the channel.
Or 656mw and 672mw.
It’s the maximum legal output the system can achieve and that’s the same number pretty much all the digital systems are at as it’s for fcc compliance. It’s range is achieved via its transmission method and not its power. Every system will have to be around the same 650mw number because that’s what’s law.
28mw would be for FCC with the specific kind of radio encoding used. While you can go to 1w or 30dmb in FCC on 2.4ghz that’s a basics signal and not a video stream.
For CE it would be between 16 and 20dbm due to much tighter requirements around LBT and the FHSS requirements.
For instance pretty much all the digital Fpv systems have the same outputs as they are limited in the same way. This includes DJI Ocusync and Lightbridge.
@MadRC So in a nutshell you mean that the RF power output is always constant, that is, within about 650 to 672mW, but the transmission distance is locked by the software (or as u said “by transmission method”) which limits the vehicle to 12km in CE mode and limits the drone to 20km in FCC mode?
? or there was noise in the video (that i doubt would occur in digital video system)
??
