USRP Handshake

GNU Radio
1

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

2

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]
Discuss-gnuradio Info Page

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

3

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?

4

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

5

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

6

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]
Discuss-gnuradio Info Page

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

–
Sincerely,

Surya A.
University Al Azhar of Indonesia, Jakarta