On 05/03/2010 10:37 PM, William Pretty Security Inc wrote: > > Ok. > > So I combined the suggestions from Josh and Marcus: > > > > Variables: > > decim: Value: 8 > > samp_rate: Value: 100e6/decim > > tun_freq: Value: 56e6+(tune*1e6) > > tune: Value: 0 > > > > Signal Source: > > Output type: float > > Sample Rate: samp_rate > > Waveform: Triangle > > Frequency: .01 > > Amplitude: 1 > > Offest: 0 > > > > Variable Sink: tune > > Type: Float > > Decimation: decim > > Vec Length: 1 > > > > Here's what happened: > > The FFT Sink block controls work, but the center frequency doesn't change. > > Also the arrow between the Signal Source and the Variable Sink is > grayed out and I don't know why ?? > > > > > I would set the sample rate of the triangle source to something closer to nyquist myself. Having it run at 12.5 SPS seems rather wasteful when you're trying to generate a sub-Hz signal.
You may need also to put in a throttle block right after the signal source, and have that throttle match the sample rate of the signal source. I would suggest a sample rate of 1000Hz would be more than adequate to give you the resolution you need for a sub-1Hz triangle wave. -- Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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