The DTV-5100 device is a DVB-T USB dongle made by AME.
According to this website, it is also sold under the name "TechGear DigitalTV Stick (TGTV-490)".

It contains the following chipsets:

• QT1010: tuner
• WJCE6353: demodulator
• CY7C68013A: USB controller

Here is what lsusb reports:

Bus 002 Device 007: ID 06be:a232 AME Optimedia Technology Co., Ltd

Here is what /proc/bus/usb/devices reports:

T:  Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#=  7 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=06be ProdID=a232 Rev= 1.00
S:  Manufacturer=AME
S:  Product=USB2.0 DVB-T Dongle
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=dvb_usb_dtv5100
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:  If#= 0 Alt= 1 #EPs= 1 Cls=ff(vend.) Sub=00 Prot=00 Driver=dvb_usb_dtv5100
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms

It is directly in "warm" state, so it does not need a firmware to work.

A working driver called "dvb-usb-dtv5100" is available from the LinuxTV repository.
It is included in the kernel mainline since version 2.6.28.

This is a quick hack to use the DTV-5100 under Linux in user-mode.
It will directly dump the MPEG2-TS stream for the given frequency.

Notes:

• You will need libusb-dev to build this tool.
• You may need to be root in order to access the USB device.
• You can have several channels in the same MPEG2 output file.

To record all channels on frequency 474 Mhz:

./dtv5100 474000000 file.mpg

To view the channels of frequency 562 Mhz:

./dtv5100 562000000 /dev/stdout | mplayer -cache 32768 -

You can still switch channels within this frequency using mplayer keys.

Download: dtv5100-user-0.1.tar.gz