[Hackrf-dev] power

[Rich Sanders]

Also, don't forget, a 3 db gain is a doubling of power, a 3 db reduction is
a halving of power.

On Tue, Mar 8, 2016 at 6:42 PM, Roy Harcup <roydxb at me.com> wrote:

> 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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> > HackRF-dev at greatscottgadgets.com
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>
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