Re: [Discuss-gnuradio] TX time control

[Derek Kozel]

Hello Yeo,

Your application is becoming complicated enough that you will have to start writing Python code to support the timed transmissions.

The GNU Radio manual has details about adding tags to the start of each burst so that they are transmitted at a specific time. You can use just the start and end of burst tags if you do not care about the actual timing, but for a radar application you certainly will care about the timing of each chirp.
https://gnuradio.org/doc/doxygen/classgr_1_1uhd_1_1usrp__sink.html
https://gnuradio.org/doc/doxygen/page_uhd.html

Regards,

Derek

On Tue, May 15, 2018 at 7:58 AM, Yeo Jin Kuang Alvin (IA) <address@hidden> wrote:

Hi everyone,

Somehow, I managed to transmit by sending few pulse length and waiting for few pulse length using "Signal Generator Sync Pulse" and I have attached the .grc . If I am not wrong 1 pulse width of the signal source (sawtooth) is samp_rate/Freq = 6000, so in this example I am sending 1ms (6000 pulse length) and wait for 2ms (12000 pulse length).

The problem I faced now is the starting waveform that is sending is not fixed, it starts anywhere in the waveform. If I am making a chirp signal out, I want it to send at the start and stop 1ms later. How am I gonna solve this problem? Is it by inserting delays or is there a better solution to this?

Thank you in advanced!

-----Original Message-----

From: Discuss-gnuradio [mailto:discuss-gnuradio-bounces+yjinkuan=dso.org.sg@gnu.org] On Behalf Of Yeo Jin Kuang Alvin (IA)
Sent: Tuesday, 15 May 2018 1:10 PM
To: address@hidden
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] TX time control

Hi,

Alright! I was thinking of using square wave and a multiplier but the duty cycle is 50%, I don't know how to change it.

If I am sending a sine wave using signal source connected to the sink, how can I send in zero's after 2s for example? Is there any time control or variable I can use?

Thank you in advanced!

-----Original Message-----
From: address@hidden [mailto:address@hidden]
Sent: Tuesday, 15 May 2018 12:56 PM
To: Yeo Jin Kuang Alvin (IA)
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] TX time control

On Mon, May 14, 2018 at 08:13:13AM +0000, Yeo Jin Kuang Alvin (IA) wrote:
> I would like to transmit for an amount of samples/seconds, and stop transmitting for another few seconds and then transmit again. Example, transmit 2s, stop for 3s and then transmit for 2s and rinse and repeat.

You could try sending zero's into your sink block. That will effectively cause your radio to cease transmitting without actually turning it off.

BW


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