Forum: GNU Radio Fwd: Pmr_Transmitter

Hi Sajjad,

This is what the flowgraph should look like:

http://scanoo.com/grc/20130122_scanoo.com_wav_nbfm...

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...
.

Cheers,

Mike
M0MIK

---------- Forwarded message ----------
From: Sajjad Safdar <engrsajjadsafdar@yahoo.com>
Date: 23 January 2013 14:57
Subject: Re: [Discuss-gnuradio] Pmr_Transmitter
To: "mikejamo@gmail.com" <mikejamo@gmail.com>


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 <mikejamo@gmail.com>
*To:* Sajjad Safdar <engrsajjadsafdar@yahoo.com>
*Cc:* "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org>
*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 <engrsajjadsafdar@yahoo.com> 
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