Setting Wlan Channel to 13 fails

[hruodr at gmail.com]

Dear Sirs!

I just installed FreeBSD 10.0 and couldnt set the channel
of my wlan interface to 13.

It is a  Ralink Technology (run driver) that worked under
OpenBSD in Channel 13.

I tried to set the channel with "ifconfig wlan1 channel 1".
I get the message: "unknown/undefined channel number 13".

Before trying to set the channel, I set the country. I tried
it with "ifconfig wlan1 country DE" and 
"ifconfig country DEBUG".

I thank you for any help.

Rodrigo.