Roger, will give the hackrf_transfer command a go when I have access to a spec-an next.
Cheers, Mark On Sun, Feb 1, 2015 at 10:48 AM, Paul Connolly <[email protected]> wrote: > It could be acting like a short circuit, and you would see no difference > switching the TX amp on or off. I'm sure it depends on the mode of failure. > > IC's U13 & U25 are part number MGA-81563-TR1G one is for RX and the other > is TX. I think U13 is RX and U25 is TX, you should to load up the schematic > in KiCAD and check. > (source: > https://github.com/mossmann/hackrf/blob/master/doc/hardware/hackrf-one-bom.csv > ) > > Probably best to verify with the hackrf_transfer command as well before > masking the board with aluminium foil, kapton tape and blasting with hot > air. > > > On 31/01/2015 23:24, Mark Jessop wrote: > > 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 <[email protected]> > <[email protected]> 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 > [email protected]https://pairlist9.pair.net/mailman/listinfo/hackrf-dev > > > > _______________________________________________ > HackRF-dev mailing > [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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