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 <[email protected]> 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 <[email protected]> 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 > > > > _______________________________________________ > > HackRF-dev mailing list > > [email protected] > > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >
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