[Discuss-gnuradio] upconversion problem

[crjqq]

I'm using a FLex900 daughterboard with the usrp. I used the usrp_siggen.sh 
script from the /gr-usrp/apps folder.
I wanted a sinusoidal carrier(no modulation) at 915Mhz. However after running 
the code I observe max. power at 920Mhz in the spectrum analyzer and a small 
peak at 915Mhz.

I am not clear how the wfreq(waveform freq) parameter in the foll. line of code:
 /* Set up the signal source */
  siggen = gr_make_sig_source_c(input_rate, GR_SIN_WAVE, wfreq, amp);

affects the output.

The output that was displayed was:
--------------------------
which:    0
interp:   128
rf_freq:  9.15e+08
amp:      5.000000
nsamples: 0
Subdevice name is Flex 900 Tx MIMO B
Subdevice freq range: (8e+08, 1e+09)
mux: 0x000098
usrp->dac_freq(): 128000000
usrp->interp_rate(): 128
baseband rate: 1e+06
target_freq:     915000000.000000
ok:              true
r.baseband_freq: 920000000.000000
r.dxc_freq:      -5000000.000000
r.residual_freq: 0.000000
r.inverted:      0
--------------------------

I dont know if I'm setting incorrect values or using a wrong approach. Please 
help me out.

Thanks
-Rush