[Discuss-gnuradio] Fwd: Pmr_Transmitter

[Mike Jameson]

Hi Sajjad,

This is what the flowgraph should look like:

http://scanoo.com/grc/20130122_scanoo.com_wav_nbfm_tx.grc.png

You appear to be missing the 'Polyphase Arbitrary Resampler' block which is vital in order to get this to work.

Make sure you install gnuradio using the following command:
wget http://www.sbrac.org/files/build-gnuradio && chmod a+x ./build-gnuradio && ./build-gnuradio

More info here: http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGR#Using-the-build-gnuradio-script.

Cheers,

Mike
M0MIK

---------- Forwarded message ----------
From: Sajjad Safdar <address@hidden>
Date: 23 January 2013 14:57
Subject: Re: [Discuss-gnuradio] Pmr_Transmitter
To: "address@hidden" <address@hidden>

Hi Mike,
Thanks for the help. I have build the graph as per your suggestion but the result is not better. I have also edited some values in my graph. But still not good quality or atleast average quality in Received signal on PMR446 radio. I am using RFX400 daughter card in my and ur graph. I have put up the screen shoots of the flow graph. Can you please help me out.

Best Regards,
SAJJAD SAFDAR

---

From: Mike Jameson <address@hidden>
To: Sajjad Safdar <address@hidden>
Cc: "address@hidden" <address@hidden>
Sent: Tuesday, January 22, 2013 10:25 PM
Subject: Re: [Discuss-gnuradio] Pmr_Transmitter

Hi,

I've just put this together for you.  It works on my USRP2 and WBX but if you have a USRP1 then you must change 'tx_samp_rate' to '64e6/256'.

Download the following two files from http://scanoo.com/grc :

1) 20120122_scanoo.com_wav_nbfm_tx.grc
2) illbeback.wav

Load the GRC file and edit the WAV source block to point to 'illbeback.wav'. Set your PMR446 receiver to channel 7 (446.08125 MHz) and run the flowgraph. With any luck you should hear Arnie :)

Cheers,

Mike
M0MIK

On 22 January 2013 15:44, Sajjad Safdar <address@hidden> wrote:

Hi,

I have design a pmr446 transmitter. The received signal is not that mush good quality and a lot of noise in it. Can any body suggest what to do to get good quality signal. The wave file i am using has 22.05 KHz sample rate.

Best Regards,

SAJJAD SAFDAR

MSc. Communication Engineering

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20130122_scanoo.com_wav_nbfm_tx.grc.png
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Pmr_transmit.grc.png
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Screenshot at 2013-01-23 15:51:02.png
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