Re: [Discuss-gnuradio] foreacast (mis)behavior for gating block

[Jared Dulmage]

Martin, et. al,

I apologize for the delayed response.  My forecast function had merely:

def forecast(self, noutput_items, ninput_items_required):
    ninput_items_required[0] = noutput_items

I determined my error.  In my flow graph I had 

vector source -> throttle -> frame sync (DUT) -> vector sink

and I found my forecast was being called with ever decreasing noutput_items.  
The problem was my throttle rate was too low (on the order of samples/second) 
and the frame sync block was being starved for input.  I probably could have 
waited longer until samples collected in throttle to be sent to my DUT, but the 
forecast messages arrived so fast it looked like an unending loop.

Thanks.
Jared.
------------------------------------------------------
Jared Dulmage
Engineering Specialist
Digital Comm. and Implementation Dept.
Aerospace Corporation
310-336-3140