USRP Handshake

Hello everyone,

I try to transmitting a file using PSK modulation with 2 x USRP B200 as
Tx
and Rx. When I run the Tx’s fg, the Tx only transmitted before the Rx fg
completely run. But when I run the Rx’s fg, the file sink already write
something before I run the Tx’s fg. Is there any way to both Tx and Rx
“handshake” before transmission started?


Sincerely,

Surya A.
University Al Azhar of Indonesia, Jakarta

Maybe use a squelch block and wait for for received power to exceed
some critical level? Or use timed events?

On Wed, Jun 10, 2015 at 1:47 PM, Surya A. [email protected]
wrote:

Surya A.
University Al Azhar of Indonesia, Jakarta


Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio


GDB has a ‘break’ feature; why doesn’t it have ‘fix’ too?

Examples of the squelch block include
http://www.ece.uvic.ca/~elec350/grc_doc/ar01s01s03.html and
http://files.ettus.com/tutorials/labs/Lab_1-5.pdf

I’ve never used timed events in gnuradio, I just know that you can do
things in a time-aligned way. You may want to google for “gnuradio
squelch” and “gnuradio timed”

Out of curiousity, why do you need to handshake? What’s wrong with a
little bit of silence or noise at the beginning and end of your
recording?

On Wed, Jun 10, 2015 at 3:02 PM, Surya A. [email protected]
wrote:

wrote:

Sincerely,

Surya A.
University Al Azhar of Indonesia, Jakarta


GDB has a ‘break’ feature; why doesn’t it have ‘fix’ too?

I want to transmitted digital file (i.e. .jpg) with file source on Tx
side
then received the file with file sink.
It’s not about “silence or noise” because I use access code from packet
decoder, the problem is when I start the Rx’s fg the file sink
immediately
write file output even Tx’s fg not run. Or when I start the Tx’s fg
first,
the file transmitted (repeat = off) but the Rx’s fg not start yet. I
doubt
these situation will compromised the output file.

I haven’t test it yet, still working to “remove” the noise from
transmission.

On Thu, Jun 11, 2015 at 5:15 AM, Chris K. [email protected]
wrote:

recording?

some critical level? Or use timed events?

completely run. But when I run the Rx’s fg, the file sink already



GDB has a ‘break’ feature; why doesn’t it have ‘fix’ too?


Sincerely,

Surya A.
University Al Azhar of Indonesia, Jakarta

Hi Surya,

I use access code from packet decoder

That sounds like a good approach; you should have told us earlier!

Problem is when I start the Rx’s fg the file sink immediately write
file output even Tx’s fg not run.

this means that the access code checking doesn’t work.

Best regards,
Marcus

Would you mind to tell me how?
I have no idea.

On Thu, Jun 11, 2015 at 4:54 AM, Chris K. [email protected]
wrote:

completely run. But when I run the Rx’s fg, the file sink already write
Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio


GDB has a ‘break’ feature; why doesn’t it have ‘fix’ too?


Sincerely,

Surya A.
University Al Azhar of Indonesia, Jakarta

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