# Dx Patrol Setup

**URL:** <https://www.ruby-forum.com/t/dx-patrol-setup/242496>\
**Category:** GNU Radio\
**Created:** [June 28, 2015, 1:33am UTC](https://www.ruby-forum.com/t/dx-patrol-setup/242496 "2015-06-28T01:33:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [June 28, 2015, 1:33am UTC](https://www.ruby-forum.com/t/dx-patrol-setup/242496/1 "2015-06-28T01:33:23Z")

</div>

Hello.

I have been buying today a DX Patrol SDR board. Works on Android,  
however I’m getting some troubles with GRC.

#rtl\_eeprom  
Found 1 device(s):  
0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM  
Found Rafael Micro R820T tuner

Current configuration:

* * *

Vendor ID: 0x0bda  
Product ID: 0x2838  
Manufacturer: Realtek  
Product: RTL2838UHIDIR  
Serial number: 00000001  
Serial number enabled: yes  
IR endpoint enabled: yes  
Remote wakeup enabled: no

GRC console:

Using Volk machine: sse4\_2\_64\_orc  
gr-osmosdr v0.1.4-31-gb3fdf5b8 (0.1.5git) gnuradio 3.7.5  
built-in source types: file fcd rtl rtl\_tcp rfspace  
Using device #0 Realtek RTL2838UHIDIR SN: 00000001  
Found Rafael Micro R820T tuner  
[R82XX] PLL not locked!  
Exact sample rate is: 2000000,052982 Hz  
[R82XX] PLL not locked!  
INFO: Audio sink arch: alsa  
len(audio\_taps) = 2409

A Terratec board with an Elonic s E400 tuner is working without any  
major problem at the test frequency (98.6 M).

May I ask for help?

Tnx

Marco

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<div class="post-metadata">

**Author:** ![marco](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a698b9/32.png) [@marco](https://www.ruby-forum.com/u/marco)\
**Post date:** [June 28, 2015, 3:52pm UTC](https://www.ruby-forum.com/t/dx-patrol-setup/242496/2 "2015-06-28T15:52:08Z")

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Some applications (e.g. DVB) automatically acquire the RTL at  
boot, preventing Gnuradio from opening it.

sudo rmmod dvb\_usb\_rtl28xxu rtl2832

at the command line, each each boot, or

blacklist the device by creating a somefilename.conf file in  
/etc/modprobe.d  
(may depend on Linux distribution) containing:

blacklist dvb\_usb\_rtl28xxu  
blacklist rtl2832  
blacklist rtl2830

– Tom, N5EG

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<div class="post-metadata">

**Author:** ![marco](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/a698b9/32.png) [@marco](https://www.ruby-forum.com/u/marco)\
**Post date:** [June 28, 2015, 5:22pm UTC](https://www.ruby-forum.com/t/dx-patrol-setup/242496/3 "2015-06-28T17:22:41Z")

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Hello.

Yes, tnx. I have a procedure that removes the rt2832 and related drivers  
before starting grc.

The problem is that the source gr-osmosdr is able to connect the board  
however the R820T’s PLL is not working.

Marco

Il 28. 06. 15 15:50, Tom McDermott ha scritto:

> Some applications (e.g. DVB) automatically acquire the RTL at  
> boot, preventing Gnuradio from opening it.
> 
> sudo rmmod dvb\_usb\_rtl28xxu rtl2832
> 
> at the command line, each each boot, or
> 
> blacklist the device by creating a somefilename.conf file in  
> /etc/modprobe.d  
> On Sat, Jun 27, 2015 at 4:12 PM, Marco \<[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)\> wrote:  
> Using device 0: Generic RTL2832U OEM  
> IR endpoint enabled: yes  
> [R82XX] PLL not locked!  
> Tnx

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