I have just installed two BroadLink RM4 Pro Devices. These have Dual RF Frequencies 315MHz & 433MHz. My expatiations were to have control of the Television, Amplifier, And the Comcast Cable Box (433MHz FM). Of all the universal devices, none state whether they are Amplitude and/or Frequency Modulated. It two weeks to find out why everything I tried, was not compatible with Comcast. Being they are such a large corporation, tech support can only advise how to operate their issued remote.
Any advise, recommendations, or technical/specifications information would be greatly apricated!