Currently I am trying to make an ASK (Amplitude Shift Keying)

I use GNURadio Companion,

The program gets the input from file source and multiplies it with signal
source.

And I monitors via Scope and FFT plots

You can see a diagram ASK.grc (image) <http://goo.gl/0WHt>

And the result is somewhat weird. Plots (image) <http://goo.gl/UcF9>

It seems sinusoidal, but the shape looks like sawtooth!

I thought that the program couldn't hold values from file source

So, I am wandering whether there is a method for holding a value
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