I had a thought about memory usage, and the idea being that in most cases
(HF) people will be using the modem half-duplex. This means that while the
modem is receiving, it can allocate global memory one way, and then when it
switches to transmit it can free and reallocate global memory a second way.
This allows the modem to operate in much less RAM requirements.
Of course the switching time if too great would be a bummer if it took more
than a second to free and allocate.
On VHF/UHF of course you really need full duplex, as almost everyone has
dual-band radios these days. But that could be a "+" modem for only $49.95
USD more :-)
Steve
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