Nate Duehr wrote: > > > > > 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?
Yes - illegal. ;-> Seriously, I would submit that any repeater - even one built into the dual bander - is subject to the same control requirements as any other repeater. This includes prohibited Primary Control on either input frequency. With respect to listening for commands, do you mean a device that is bi-directional but can sample the TX frequency for commands? Otherwise, if you're talking about a device that is bi-directional but can sample the RX frequency for commands, you're just talking about a controllable radio. (which would probably not be legal - see above for why) Yes, there are lots of illegal activities that are accepted practices on the bands. Joe M.
