You have to take your Directv HR21 receiver out of RF mode in settings, program remote. The RC65 is not a RF REMOTE ...You need to select IR mode in the receiver settings.
I believe the codes 00001 and 00002 are valid for all DirectTV receivers.
Instructions for entering the codes are here. Instructions for searching for the proper code if those two don't work, or for other devices, are here. If you'd like a digital manual for your RC65, click here.
Answers & Comments
You have to take your Directv HR21 receiver out of RF mode in settings, program remote. The RC65 is not a RF REMOTE ...You need to select IR mode in the receiver settings.
I believe the codes 00001 and 00002 are valid for all DirectTV receivers.
Instructions for entering the codes are here.
Instructions for searching for the proper code if those two don't work, or for other devices, are here.
If you'd like a digital manual for your RC65, click here.
I hope that helps.