This converts DTV over-the-air channels to analog RF channels, to allow your recorders to record any converted channel at any time without changing the channel on the CECBs, provided that you have 1 CECB per DTV channel that you might record.
Advantages (some): CHEAP: Cost is only 2CECB+cables+$30+2amplifiers for both first two CECB, Can use CECB+cables+$45 for addtional channels; not including the TV, splitters, and antenna of course.
Don't ever have to change converter box channel after setup.
All recording devices with analog RF inputs can record any channel, any time.
You can use your old analog DVRs such as Pioneer DVR-640 for all channels you convert.
Doesn't require an AV professional to hook up.
You don't need a rack for AV equipment, they are just small boxes that can lay on the floor, inside or behind the TV cabinet.
The Holland SC-x does not require power.
Disadvantages: You must program your recorders only for channels 3,4, and others must be between 14 and 83. This means you must translate your channel numbers yourself. Mine are: 2=4, 3=6, and 14=13 for instance.
Uses up a line input to your TV set for each recorder used, and you must have at least that number of line inputs.
The Holland HMM-10H instructions are too cryptic, making it hard to program.
You must (temporarily) rewire in order to record directly from most recorders to most recorders.
I have been told that you do not get stereo sound from the RF outputs on the CECBs. Therefore, if this is true, this setup would not transmit stereo to the recorders/TV on analog channels 3 and 4 only.