Thanks for the link Skip. I used the first example in the guide (with
freq changed to a known local FM station) as
rtl_fm -W -f 90.1M | play -r 32k -t raw -e signed-integer -b 16 -c 1 -V1 -
but all I am able to hear is noise. So I'm still stuck wondering if my
dongle is working or not since I can't get any signals at all -- only noise.
I get two messages that look like the may indicate a problem:
"[R820T] PLL not locked for 3926090 Hz"
and
"WARNING: Failed to set center frequency."
Any idea what these mean?
On 8/19/2013 6:03 PM, Skip Tavakkolian wrote:
For a quick sanity check I use rtl_fm to tune into a
local FM station.
Here is a good guide for rtl_fm:
http://kmkeen.com/rtl-demod-guide/index.html
On Aug 19, 2013, at 2:02 PM, Curt Carpenter <1cjcarpenter(a)att.net
<mailto:1cjcarpenter@att.net>> wrote:
> Hello!
>
> I received my USB-DVB-T+DAB+FM dongle last week, and have been trying
> to find a signal with it since, but with no luck. Can anyone tell me
> how to tell if it is working at all?
>
> I'm using the Windows version of Osmocom under WinXP.
>
> Using rtl_eeprom, I get the following display:
> --------------------------
>
> Vendor ID 0x0bda
> Product ID 0x2838
> Manufacturer Realtek
> Product RTL2838UHIDIR
> Serial Number 00000000001
> Serial Number Enabled Yes
> IR Endpoint Enabled Yes
> Remote Wakeup Enabled No
>
> -----------------------
>
> When I run
>
> rtl_test -s 1.6e6
>
> I get the following response:
>
> -----------------------
>
> Found 1 device(s)
> 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
> Using device 0: ezcap USB 2.0 DVB-T/DAB/FM dongle
> Supported gain values(29): 0.0 0.9 .... 49.6
> Info: This tool will continuously read from the device, and report
> if samples get lost.
> If you observer no further output, everything is fine.
>
> Reading samples in async mode...
>
> --------------------------
>
> If at that point after a while I press Control C, I get
>
> ---------------------------
>
> Signal caught, exiting!
>
> ---------------------------
>
> But then my command prompt window hangs up and will do nothing until
> I close it all together.
>
> Does it appear that my dongle is working? Where do I find out how to
> use the different gains that are listed by rtl_test? Could my
> difficulties have anything to do with the fact that my dongle is IR
> Endpoint enabled?
>
> I am brand new to this, and haven't had much luck so far, although I
> think I've gotten further with Osmocom and Windows than with anything
> else I've tried. Any help/advice/links to more information will be
> much appreciated. Sorry for the long post -- I was trying to provide
> as much information as I could.
>
>
> Thanks
> Curt Carpenter
>
>
>