Re: [Discuss-gnuradio] USRP Handshake

[Marcus Müller]

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

On 06/11/2015 11:00 AM, Surya Agam wrote:

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 Kuethe <address@hidden> wrote:

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 Agam <address@hidden> wrote:
> Would you mind to tell me how?
> I have no idea.
>
> On Thu, Jun 11, 2015 at 4:54 AM, Chris Kuethe <address@hidden>
> wrote:
>>
>> 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 Agam <address@hidden>
>> wrote:
>> > 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 Agam
>> > University Al Azhar of Indonesia, Jakarta
>> >
>> > _______________________________________________
>> > Discuss-gnuradio mailing list
>> > address@hidden
>> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>> >
>>
>>
>>
>> --
>> GDB has a 'break' feature; why doesn't it have 'fix' too?
>
>
>
>
> --
> Sincerely,
>
> Surya Agam
> University Al Azhar of Indonesia, Jakarta



--
GDB has a 'break' feature; why doesn't it have 'fix' too?

--

Sincerely,

Surya Agam

University Al Azhar of Indonesia, Jakarta

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