Re: [Discuss-gnuradio] Enveloping a transmit amplifier

[devin kelly]

Marcus,

Thanks for the advice, this seems to do exactly what I'm looking for.  My only question is that I've been under the impression that the UHD doesn't yet support GPIO for the B210.  I did recently upgrade to 3.8.5 though so maybe things have changed?

Devin

On Wed, Aug 19, 2015 at 5:43 AM, Marcus Müller <address@hidden> wrote:

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

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

_______________________________________________
Discuss-gnuradio mailing list
address@hidden
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

--

http://alum.wpi.edu/~dkelly/