Difference in Outputs using Hierarchical Block

[tom sutherland]

I have a simple GRC flowgraph that generates and displays a chirp signal.I 
created a hierarchical block that generates the chirp signal but when 
substitute it in for the blocks I used to generate the Hier block, it gives a 
slightly different output. I generate a ramp signal and feed that into a VCO. 
Instead of a nice ramp function the ramp now has a 1000us flat spot at the 
beginning of the ramp. The ramp is supposed to be 6500us, but when using the 
Hier Block the first 1000us jump up to 0.18 and stays there until the ramp 
starts. Is there some kind of delay or penalty for using a Hier 
Block?Thanks...Tom

chirpHierBlk.grc
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chirpHierBlk.py
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ChirpSignal_USRPCablesSpectrogram.grc
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ChirpSignal_USRPCablesSpectrogramDifferenceWithHierBlk.png
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