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tech / sci.electronics.design / Re: DJI mini 2

SubjectAuthor
* DJI mini 2TTman
+- Re: DJI mini 2John Walliker
`- Re: DJI mini 2Dan Purgert

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DJI mini 2

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From: kraken.s...@gmail.com (TTman)
Newsgroups: sci.electronics.design
Subject: DJI mini 2
Date: Thu, 25 Jan 2024 16:57:56 +0000
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 by: TTman - Thu, 25 Jan 2024 16:57 UTC

A question about range.... In their spec, they claim max range = 15.7 kM
this is the radio spec:-
Transmitter Power (EIRP)
2.400-2.4835 GHz
FCC ≤ 26 dBm
CE ≤ 20 dBm
SRRC ≤ 20 dBm

5.725-5.850 GHz
FCC ≤ 26 dBm
CE ≤ 14 dBm
SRRC ≤ 26 dBm

What is that in terms of mW in the UK and what would the range be?
I presume the 2.4 Ghz is the controller and the 5.8 is video ?

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Re: DJI mini 2

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Subject: Re: DJI mini 2
From: jrwalli...@gmail.com (John Walliker)
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 by: John Walliker - Thu, 25 Jan 2024 19:27 UTC

On Thursday 25 January 2024 at 16:58:04 UTC, TTman wrote:
> A question about range.... In their spec, they claim max range = 15.7 kM
> this is the radio spec:-
> Transmitter Power (EIRP)
> 2.400-2.4835 GHz
> FCC ≤ 26 dBm
> CE ≤ 20 dBm
> SRRC ≤ 20 dBm
>
> 5.725-5.850 GHz
> FCC ≤ 26 dBm
> CE ≤ 14 dBm
> SRRC ≤ 26 dBm
>
> What is that in terms of mW in the UK and what would the range be?
> I presume the 2.4 Ghz is the controller and the 5.8 is video ?

20dBm is 100mW
14dBm is 25mW

A range of 15.7km sounds very unlikely.
The Amazon listing for that drone only claims "up to" 6km range for HD video.

John

Re: DJI mini 2

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From: dan...@djph.net (Dan Purgert)
Newsgroups: sci.electronics.design
Subject: Re: DJI mini 2
Date: Tue, 30 Jan 2024 13:46:26 -0000 (UTC)
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 by: Dan Purgert - Tue, 30 Jan 2024 13:46 UTC

On 2024-01-25, TTman wrote:
> A question about range.... In their spec, they claim max range = 15.7 kM
> this is the radio spec:-
> Transmitter Power (EIRP)
> 2.400-2.4835 GHz
> FCC ≤ 26 dBm
> CE ≤ 20 dBm
> SRRC ≤ 20 dBm
>
> 5.725-5.850 GHz
> FCC ≤ 26 dBm
> CE ≤ 14 dBm
> SRRC ≤ 26 dBm
>
> What is that in terms of mW in the UK and what would the range be?

26 dBm = 400 mW
20 dBm = 100 mW
14 dBm = 25 mW

(or close enough to, anyway).

Not sure if the UK still follows the European Union's "CE" ratings, but
that's probably the best bet (FCC and SRRC are the USA and China,
respectively).

Given the tables above, the US has the best chance at that 15km range on
both bands; but it really comes down to the environmental conditions
(i.e. how noisy the radio bands are) and line-of-sight to the drone.

15km will be quite a weak signal -- about -95 dBm or so with the US EIRP
rating and 3dBi antenna on the receiver (and that I'm doing the math
right ;) ).

> I presume the 2.4 Ghz is the controller and the 5.8 is video ?

Maybe. I don't have this one (or one with any camera for that matter).

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