Hi Marcus, thanks a lot for sending the flowgraph. I completely understand it and I am very confident that I can get this going. Only thing, I currently don't have an external 3,5mm plugged microphone :-)
BR Markus DL8RDS Am Mittwoch, den 03.11.2010, 23:54 -0400 schrieb Marcus D. Leech: > On 11/03/2010 11:11 PM, Markus Heller M.A. (relix GmbH) wrote: > > Hi Marcus, > > > > great, now I know what was wrong. I didn't expect my dummy load to be so > > safe. It was a real signal lock :-) > > > > For all the others, here's a short experiment report: > > > > Here are the parameters: > > > > * Sample rate 200k > > * Signal source at 1 KHz, amplitude at a minimum of 0.001 - to > > make sure that a bad SWR does no harm. BTW, this is a good > > counter check that you can really influence the output power! > > * USRP2 sink: interpolation 500, frequency 14 MHz > > > > Result: I hear a clear signal at 14.000 MHz, +/- 1 kHz > > > > Thanks very much! > > > > > In the spirit of a "conspiracy of Mar[ck]uses": > > http://www.sbrac.org/files/ssb_xmitter.grc > > It's not actually connected to USRP2, but to an FFT sink, but it samples > at 200KHz, so one > could easily replace that FFT block with an USRP2 block. > > It uses an audio source sampled at 20KHz, and then uses a bandpass > filter after interpolating > up to 200KHz to pick off either the upper or lower side-bands, which > are limited to a roughly > 2.7KHz bandwidth: LSB: -3KHz to -300Hz and USB: 300Hz to 3KHz. > > Audio and baseband signal levels will need to be adjusted, etc, but it's > a good starting point. > > It uses a "0Hz carrier", which happens to work perfectly when you're > dealing with a > complex baseband signal. > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio