---- Steve Glass <stevie.glass(a)gmail.com> wrote:

Hi, I'm still working in the theoretical part before that I use an USRP so I need a signal sample too. Is it from this page that you took it? http://op25.osmocom.org/trac/wiki.png/wiki/SamplesPage You just have to put it in the filesource section to use it right? What I don't understand is how you configure the following sections (like the center frequency etc..) and how the .dat.info file is suppose to help you (i's like there are almost no information inside the file)? Thanks in advance for your awnsers Souf --- In op25-dev(a)yahoogroups.com, <md123@...> wrote:

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/31/2013 07:22 PM, souf308 wrote: Hi Souf, yes the capture rate is the sample rate. sample per symbol is what changes the channel rate, don't change the channel rate directly; I believe the channel rate should be between 19.2k and 43.2k. decimation changes the pre_channel rate, looks like he had it set at 256. I have found that it is best to play a file is with the flow graph set exactly as it was set when the file is captured. If you want to have a go with a capture I made I put the file up for download at: http://www.fileswap.com/dl/9kfgeOXMz/ I think the frequency, sample rate, decimation, and symbol_per_sample information is in the tar file. put a throttle right after the file source or the file will play in about 11 seconds instead of the real speed of about 40 seconds. so when you play the file first you tune to the frequency, next on the BB-1 tab you wait for the carrier freq to pop up, then go to the X-late1 tab and use the offset to get the channel at zero and narrow the bandwidth with the xlateBW slider, then go to the Dbits tab select autorange and change the marker to dots. you'll see the dots go from scattered into 4 perfect lines and you'll hear the transmission. Thanks