Did you execute modprobe -v rt3070sta command without errors?
Check rt3070sta module in memory
lsmod | grep rt3070sta
Please post output of commands:
dmesg | grep rt3070
dmesg | grep rt2*
it should be last lines of dmesg command output
dmesg ->
rtusb init---->
usbcore: registered new interface driver rt2870…
Ok, thats just the entry in the kernel. And then the messages stop.
But iwconfig dont detect wireless interface.
Please post output of commands:
lsmod | grep rt2870
lsmod | grep rt3070sta
rt2870 gives no message.
rt3070sta shows me rt3070sta 560820 0.
Try to reboot.
Also try to use latest firmware from Ralink corp.
novsan… How do I install the image for the firmware?
Its a binary.
Make a backup copy of /lib/firmware/rt2870.bin file. Download firmware from ralink. Currently is ver 22 03/31/10. unpack archive and copy rt2870.bin to /lib/firmware/ directory.
And just to say - if you compile your own driver - look [SOLVED] rt3070sta: module license ‘unspecified’ taints kernel. - Linux Forums](http://www.linuxforums.org/forum/wireless-internet/161550-solved-rt3070sta-module-license-unspecified-taints-kernel.html) post #1. It resolves “unknown symbols” errors too.
novsan… Do you know the mechanics how the driver builds the interface?
Why do you need this info?
Did you install latest firmware from ralink?
Did you reload module?
Yes, installed the latest firmware from Ralink.
Reload the module several times. But it give me only 1 message that it got an entry in the kernel. And then the messages stop??? 
Right now, I’ve recieved this adapter for short time. (with a little help from my friends, thanks them). I’ll try this wonder myself. 
Nice novsan… Im curious if he starts on ur system.
It works like charm. I’ll summarize later.
In_Control01, please replug your adapter and check for network links
ip link list
Is there ra0 or wlan0 interface?
If it exist - enable it:
ip link set wlan0 up
Or for ra0 interface:
ip link set ra0 up
Next
iwconfig
novsan… U did a great job.
I check it when im home.
Did u check the data rate too?
Unfortunately, I can only scan the available wireless access points now. They are protected and i do not have access to them. 
novsan… I cant c an IP link to the interface.
only eth0 is available. But thats my ethernet NIC onboard.
Can u summarize?
And can u post ur kernel messages regarding the driver?
Try this:
1 Unplug adapter
2 remove rt3070sta module
rmmod rt3070sta
3 Plug adapter again
4 check for interfaces
ip link list
Output of dmesg command
[11558.942791] usb 1-1: New USB device found, idVendor=07d1, idProduct=3c0a
[11558.942842] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[11558.942875] usb 1-1: Product: 11n Adapter
[11558.942904] usb 1-1: Manufacturer: Ralink
[11558.942928] usb 1-1: SerialNumber: 1.0
[11558.943345] usb 1-1: configuration #1 chosen from 1 choice
[11558.983406] rtusb init --->
[11558.983746]
[11558.983748]
[11558.983749] === pAd = fa07c000, size = 471844 ===
[11558.983750]
[11558.983774] <-- RTMPAllocAdapterBlock, Status=0
[11558.986883] usbcore: registered new interface driver rt3070
In_Control01, also check /etc/Wireless directory
ls /etc/Wireless
There should be only RT3070STA directory