I petitioned the FCC in 1992 to allow TDMA voice and data, and they said it
was premature :-)
Yea, only Motorola was building those radios, so I guess they needed two
manufacturers before it was mature technology. "We don't need no
experimenters - thankyou".
Back then we didn't have GPS yet, but now synchronizing is much simpler. In
the military we had rubidium based radios, and we sent a synchronization
"mickey" to each other. I guess rubidium would probably be a WMD in todays
FBI :-)
Still, a simple dual-band antenna and old junk dual-band would be cheap.
On Mon, Jun 23, 2014 at 2:11 PM, Bruce Perens <[email protected]> wrote:
> Yes, the main use of full duplex so far has been for David's testing.
>
> Purpose-built VHF/UHF radios don't need dual-band, they can use timeslots
> and put the repeater on the same frequency as its input.
>
> Thanks
>
> Bruce
>
>
> On 06/23/2014 11:51 AM, Steve Sampson wrote:
>
> 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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