Please help

I am not sure where my prblem is.
Using my uirt with orb, the the learning phase completes fine,according to Orb. However when attempting to change channels on my cablebox, the led pulses but the channel never changes. I've tried putting the transmitter as close as possible but still no good.
Using my uirt with orb, the the learning phase completes fine,according to Orb. However when attempting to change channels on my cablebox, the led pulses but the channel never changes. I've tried putting the transmitter as close as possible but still no good.