R820T No supported tuner found

Markus Macher markus.macher at gmail.com
Sat Dec 7 14:14:25 UTC 2013

Hi all!

I hope, someone has an idea regarding my issue..

I've bought this:
The chips inside are RTL2832U and R820T.

With latest rtl-sdr from git as well as keenerd's branch , I get (as root):

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
No supported tuner found
Enabled direct sampling mode, input 1

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

Well, rtl_fm is making noises, but in direct sampling mode, I think I have
no chance to listen to the radio at all.

in librtlsdr.c, after
        reg = rtlsdr_i2c_read_reg(dev, R820T_I2C_ADDR, R82XX_CHECK_ADDR);
        if (reg == R82XX_CHECK_VAL) {
                fprintf(stderr, "Found Rafael Micro R820T tuner
        (reg=%08X, should be %08X)\n",reg,R82XX_CHECK_VAL);
        dev->tuner_type = RTLSDR_TUNER_R820T; goto found;

reg is zero instead of R82XX_CHECK_VAL

I tried to force it to be a R820T, but "pll not locked" or so..

It's standard debian wheezy with /dev/bus/usb and without /proc/bus/usb.
usb messages seem to work:
11606 ioctl(6, USBDEVFS_SUBMITURB or USBDEVFS_SUBMITURB32, 0x2133490) = 0
0x7fffed8a4dd8) = 0

Many thx,
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