I was using GNURadio Companion, not hackrf_transfer for my tests. I experimented with varying all of those parameters, and could not get an output any higher than -30dBm.
If the TX amplifier was broken, i would have expected to see a noticeable difference when i switched the amp on and off (i.e. RX LNA gain between 0 and 14dB), as from what I could tell in the schematic doing so would switch the amp in and out. Cheers, Mark On Sun, Feb 1, 2015 at 2:33 AM, Paul Connolly <eei...@gmail.com> wrote: > Are using -c 127 as an argument for your testing. And -x goes from 0 to > 47dB, why stop at 14dB ? > $ hackrf_transfer > receive -r and receive_wav -w options are mutually exclusive > Usage: > ... snip ... > [-l gain_db] # RX LNA (IF) gain, 0-40dB, 8dB steps > [-g gain_db] # RX VGA (baseband) gain, 0-62dB, 2dB steps > * [-x gain_db] # TX VGA (IF) gain, 0-47dB, 1dB steps* > ... snip ... > [-c amplitude] # CW signal source mode, amplitude 0-127 (DC value > to DAC). > ... snip ... > $ > > From https://github.com/mossmann/hackrf/wiki/HackRF-One#transmit-power > you should be seeing about 15dBm that close to 10MHz > > It could be that you have damaged the TX amplifier, did you have -a 0 in > your tests. Because if it is broken then it would probably act like an > attenuator. > > Paul > > > On 31/01/2015 12:43, Mark Jessop wrote: > > Hi all, > > Bought a HackRF a few months back, never properly measured the output power > on it when I got it unfortunately, but it has certainly dropped at some > point in the last few months. > > I finally got the chance to put it on a spectrum analyzer the other day. > Transmitting a single carrier, I'm seeing a maximum of -30dBm output power > at 14MHz. Only a few dB difference noticed when turning the RF Gain setting > from 0 to 14dBm (This does actually do something, doesn't it?) > > Any thoughts? I have the facilities to replace QFN components if required... > > Cheers, > Mark VK5QI > > > > > _______________________________________________ > HackRF-dev mailing > listHackRF-dev@greatscottgadgets.comhttps://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > _______________________________________________ > HackRF-dev mailing list > HackRF-dev@greatscottgadgets.com > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > >
_______________________________________________ HackRF-dev mailing list HackRF-dev@greatscottgadgets.com https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
