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 S. [email protected]
Date: 23 January 2013 14:57
Subject: Re: [Discuss-gnuradio] Pmr_Transmitter
To: “[email protected]” [email protected]
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 J. [email protected]
To: Sajjad S. [email protected]
Cc: “[email protected]” [email protected]
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 ScanOo.com is for sale | HugeDomains :
- 20120122_scanoo.com_wav_nbfm_tx.grc
- 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 S. [email protected]
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