Re: [Discuss-gnuradio] Enveloping a transmit amplifier

[Marcus Müller]

Hi Devin,

You wanted to ramp up/down the external PA: Use the GPIO pins, and the ATR registers [1] or timed commands issued over the message bus [2] to change their state

Best regards,
Marcus

[1] http://files.ettus.com/manual/page_gpio_api.html#xgpio_fpanel_atr
[2] http://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax

On 08/18/2015 09:17 PM, devin kelly wrote:

Hello,

0

I'm transmitting a fairly bursty, irregularly timed signal.  I attach a stream tag to the sample that has the start of the burst (tx_sob).  I also have a PA that I can turn on and off that's inbetween my USRP B210 and antenna.

I'd like to be able to turn the PA on and off synchronously, say 50 ms before tx_sob is to be transmitted.  

Is there any way to do this?  I'm thinking I could add a new tag that's 50 ms before my transmission but then how would I synchronously turn on the PA?  Is there something like a callback function I can use?  Does the UHD or the UHD block have this functionality?

Thanks for any help,

Devin

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