[solved] can't lock wireless card on a specific channel

[echo-dualis]

Hello i'm trying to inject packets into my 2.4ghz network using the following commands:
first

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ifconfig [card-name] down
iwconfig [card] mode monitor
iwconfig [card] channel 6
ifconfig [card] up

then:

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airodump-ng [card]

or

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airodump-ng --bssid [networkMAC] --channel 6 --write arp-request-rep [card] (to check #data)

third:

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aireplay-ng --fakeauth 0 -a [networkMAC] -h [myMAC] [card]
aireplay-ng --arpreplay -b [networkMAC] -h [myMAC] [card]

-Output: that my card is in channel X and jumps around but access-point is in channel Y which is fixed.
-I tried spamming --fakeauth until card is in the same channel but soon enough it changes channels again so i need to LOCK IT.
-My wireless card is alta. Chipset atheros-ar9271.
-Any advice is appreciated.

[echo-dualis]

solution (worked for me):
ifconfig $IFACE down
iwconfig $IFACE mode managed
ifconfig $IFACE up
iwconfig $IFACE channel $@
ifconfig $IFACE down
iwconfig $IFACE mode monitor
ifconfig $IFACE up