If I run /etc/irblaster/channel_change.sh 122 from a command line, I can change to the channel on the Dish 811 receiver. This tells me it works.

I have /etc/irblaster/channel_change.sh in the external channel change command under the tuner card in setup.

Channel changing does not work thru MythTv. I need some advice on this.

I have a serial irblaster with an led, with a PVR 250

the channel_change.sh is as follows:

last time I saw someone complaining of a similar problem it was because they hadn't set frequency ids for their channels in mythtv-setup. I think you need to put the number that you want the blaster to send in the "Frequency or Channel" field on the second page of the channel setup for each channel.

I did a reinstall, double checked the frequency settings, and changed the "default" setting to us cable, and it WORKED. I about had a heart attack.
Been working on this many many months.

So it is possible to control a dish 811 receiver

thanks for the direction Greg.

Dan