> > Nate Duehr wrote: >> >> On Nov 8, 2007, at 2:34 PM, Paul Plack wrote: >> >>> Manufacturers sometimes market features on new radios without regard >>> to Part 97. I have an Alinco DR570T, one of the first, if not THE >>> first, dual-band mobile to feature full duplex crossband repeat. As >>> designed, it's crossband repeat function was clearly not legal. >> >> From your description (and knowing the radio) you mean "bi- >> directional" (but not at the same time), not "full-duplex" (which >> means you can go both directions through it at the same time). >> >> I'm seeing the term "full-duplex" misused more and more in regards to >> dual-banders in cross-band repeat mode... did someone publish an >> article with this less-than-accurate terminology again >> somewhere? :-) >> >> -- >> Nate Duehr, WY0X >> [EMAIL PROTECTED] >
On Nov 8, 2007, at 9:28 PM, MCH wrote: > Simplex: One frequency - you can either TX or RX, but not both. > > Half Duplex - Two frequencies - you can either TX or RX, but not both. > Your TX frequency is different than your RX frequency. > > Full Duplex - Two frequencies - you can RX and TX at the same time. > > A repeater is Full Duplex operation. It can RX and TX at the same > time. > > Bi Directional means you can come in on one frequency and go out the > second, or come IN the second and go OUT the first. > > Joe M. Hmmm... erg. Right. So his terminology for a dual-band mobile that can repeat is correct, it's both "full-duplex" from one band to the other, and can be user configured to be uni-directional or bi- directional. Okay... so what I'm looking for is a way to describe a system that both can do full-duplex while also listening for commands on the "user input" which is something a dual-bander can't do... but a real repeater fed with the right kinds of links, can do... Is there a word for that? Maybe not. The example I'm thinking of is a hub repeater or link connected to a user repeater which are tied together in such a way such that either receiver can pass DTMF to either controller (or port on a multiport controller) so control can still be maintained, even with something transmitting "to" you... hmmm. I guess that's really just putting two bi-directional full-duplex devices back to back, which creates a "system" that's controllable even when the link is actively transmitting a signal toward the user on the user repeater. I definitely stand corrected, now I'm just trying to think of a way to describe the difference between your typical dual-bander used as a "repeater" and a properly built linking system... hmm. Thinking... -- Nate Duehr, WY0X [EMAIL PROTECTED]
