[Hackrf-dev] power

[Roy Harcup]

Hi Cinaed,

You really need to read up on dB’s.

0dBm = 1mW as you have stated;
30dBm = 1W;
40dBm = 10W;
43dBm = 20W, one more dBm will take that to somewhere around 22W (I haven’t done the calculation, I’m working from memory).

If you ’smoke’ the RF stage on the HackRF I doubt that you would see anything usable on the output, indeed you could end up with a really bad source of interference.

Best regards
Roy
Formerly G4GGS


> On 9Mar, 2016, at 09:18, Cinaed Simson <cinaed.simson at gmail.com> wrote:
> 
> Hi - I'd like to increase the TX power of the HackRF to 50 mW.
> 
> First, I disable TX.
> 
> Since the dBm=0, this implies the power output will be on the order of 1
> mW.
> 
> Then I add an external LNA with a gain of 44 dB on the RF band I'm
> transmitting on which raises the TX power of the HackRF to 44 mW.
> 
> The antenna has a gain of 6 dB - the cable and connector losses are on
> the order of 1 dB, so the maximum effective power is 49 mW.
> 
> I'm assuming this independent of the IF gain.
> 
> So I could smoke the TX amplifier on HackRF and still be able to use the
> HackRF to TX at roughly 17 dBm :).
> 
> -- Cinaed
> 
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