1 | initial version |

I'm not getting the vertical range that you are specifying, but here is what I've got. Note that the log plot only works in the latest release (5.2) of Sage.

```
z1=2 * pi * 650 * 10^6
p1=2 * pi * 1.9 * 10^9
p2=2 * pi * 5 * 10^9
adc=.667
deltaF=.2 * 10^9
N=(adc * p1 * p2)/z1
M(freq)=(-2 * i * pi * freq * z1)/((-2 * i * pi * freq+p1) * (-2 * i * pi * freq+p2))
g(frq)=20*abs(log(N*M(frq),10))
pts=[(frq,g(frq).n()) for frq in srange(10^8,10^11,deltaF)]
list_plot(pts, scale='semilogx')
```

Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.