RCU Forums - View Single Post - What's The Difference between PCM and PPM?
Old 09-24-2004 | 10:29 AM
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hilleyja
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Default RE: What's The Difference between PCM and PPM?

ORIGINAL: fiery

Jim

Maybe I'm missing something in this discussion, but if "old percy fruitcake" (every club of any size has one ) turns up with his "brand X" Tx on your frequency, and turns it on in PCM transmission without checking, there is every chance that your bird flying on the same frequency with your "brand Y" radio with it's "you beaut" PCM receiver will experience sky/earth zen.

Almost all 6 ch plus Tx's these days, apart from entry level efforts, have the PCM transmission option. So, in a practical sense, how does a PCM receiver offer you any advantage? PCM won't save you here.

That is the point I have tried to make. I don't mean to be contrary, but as far as I can see the "PCM advantage" these days is little more than marketing hype. As increasing numbers of flyers have a PCM capable Tx, it's real benefit to the R/C flyer increasingly becomes, as far as I can see in a practical sense "on the field", illusory.

PS In Australia, as is the case in most of the world, we don't suffer this ridiculous "shift" issue that many of our contributors in North America do. Here, Futaba and Hitec in PPM/FM Tx's speak quite happiy to JR,Sanwa(Airtronics) and Multiplex Rx's - all are in "downshift". Buy any PPM/FM receiver, and it will hear your Tx.

You are correct and I essentially rely of the fact that most "old percy fruitcake"s aren't running PCM. If most TXs are like the Futaba 9C it takes at least 2 conscious steps to switch from PPM to PCM. With the 9C you have to assign PCM to the model then cycle power to switch from one to the other.