Re: how to suspend the flowgragh without any signal transmission for a few sec

On Mon, Feb 14, 2011 at 3:09 AM, Venkat V. [email protected] wrote:

  1. Is time.sleep() function is an appropriate way to use for OFF
    cycles in my model ?? If not can anyone suggest me better way to
    break the transmission using GNU blocks ??

On Fri, 18 Feb 2011 14:05:33 -0500 Yan N. wrote:

how to pause the system for 5 milliseconds? … time.sleep(0.005)

The op25-dev p25 transmitter faces a similar problem of how to
have real-time PTT (push to talk) - the transmit duty cycle is
usually far lower than 100%.

During periods of inactivity, the TX block (which connects directly
to the USRP sink block) just outputs zero-valued complex samples -
so a “signal” is still transmitted, but it has zero energy - and
no sleep() is used.

Some of the gnuradio-example progs also contain calls such as
self.subdev.set_enable(enable) # set H/W Tx enable
although this might not give you a very fine tuned control in
terms of timing
( also no clue if set_enable() is universally supported or not).

Max

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