Is 56kHz for *receiving* only?

I have a Linux box running MythTV. I'm using the Hauppauge PVR-250 with the grey top/black bottom remote.
I'm in need if an IR blaster to relay the channel-change signals from my Linux box to an ExpressVu 3100 (AKA Dish Network) satellite receiver. I understand that these DishNet receivers involve a 56kHz frequency.
I'm getting conflicting information all over about this ..... do I need the 56kHz option if I am using the USB-UIRT only for emitting my channel-change commands to the ExpressVu/Dish receiver?
I will not be using the USB-UIRT for receiving signal from any remotes. From what I've been reading, the 56kHz option is only for receiving from Dish remotes??
Thanks!!
I'm in need if an IR blaster to relay the channel-change signals from my Linux box to an ExpressVu 3100 (AKA Dish Network) satellite receiver. I understand that these DishNet receivers involve a 56kHz frequency.
I'm getting conflicting information all over about this ..... do I need the 56kHz option if I am using the USB-UIRT only for emitting my channel-change commands to the ExpressVu/Dish receiver?
I will not be using the USB-UIRT for receiving signal from any remotes. From what I've been reading, the 56kHz option is only for receiving from Dish remotes??
Thanks!!