Re: [Discuss-gnuradio] PLL not locked and GCD problem

[mleech]

The "No E4000 tuner found" comes from rtl_test -t  which is useful ONLY for E4000 tuners, and you have a R820T tuner.

 

 

 

On 2015-09-18 08:38, Pedro Gabriel Adami wrote:

Hello,

I'm tuning a frequency inside of the range of the device, that is, 107.9MHz and 95.3MHz. When I blacklist the 2838 to discover only the 2832U, I see the same message: "PLL not locked" and "No E4000 tuner found, aborting".

Is it a problem? What could be the solution?

Thanks a lot.

Cheers,

2015-09-17 15:50 GMT-03:00 <address@hidden>:

The PLL not locked error is just because you've (or someone) has asked for a frequency tuning on the device that isn't possible, so the hardware is saying "can't do that".

The GCD messsage is a warning.  Given the message  you should just have used an interpolation of 1 and a decimation of 2.

Others can comment on the overall-sanity of your flowgraph.

 

 

 

On 2015-09-17 14:43, Pedro Gabriel Adami wrote:

Hello,

I'm trying to run the flowgraph available on the website of John Petrich (http://www.w7fu.com/index_files/Page774.htm). I'm using the RTL-SDR 2832U and I have already made the configurations to blacklist and fix the bugs of Ubuntu 14.04 LTS.

But when I run the flowgraphs, these messages appear and I can't hear the FM station I choose.

Generating: "/home/aluno/Downloads/RTL_WBFM_RX_QT_GUI_08262015.py"

Executing: "/home/aluno/Downloads/RTL_WBFM_RX_QT_GUI_08262015.py"

linux; GNU C++ version 4.8.4; Boost_105400; UHD_003.010.git-27-g28fa5a12

gr-osmosdr v0.1.4-48-g86ad5842 (0.1.5git) gnuradio 3.7.8
built-in source types: file fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy
Using device #0 Realtek RTL2838UHIDIR SN: 00000001
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
[R82XX] PLL not locked!
INFO: Rational resampler has user-provided taps but interpolation (512) and decimation (1024) have a GCD of 512, which increases the complexity of the filterbank. Consider reducing these values by the GCD.
Using Volk machine: sse4_1_64_orc
INFO: Audio sink arch: alsa
aU

I'm not sure but I think that this "PLL not locked" and the INFO about Rational Resampler might be the problem. Can anyone help me, please?

PS: I'm attaching the two flowgraphs from his website.

 

Thanks a lot.

--

Cheers,

Pedro Gabriel Adami

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Atenciosamente,

Pedro Gabriel Adami