This is an extract from the RR's, with much more not copied here. Got a question? More is available online at the 4U1ITU web site. It's an excellent document with lots from which to learn.
73, art….. W4ART Arlington VA On 27-Jul-2011, at 03:59 PM, (kp4tr)Ramon Gonzalez wrote: > Broadcast? > > Sent from my Adobe Flash and Java challenged iPhone > > On Jul 27, 2011, at 3:24 PM, "Nigel A. Gunn, W8IFF/G8IFF" <[email protected]> > wrote: > >> Art... >> What's the definition then of a one way only link, as in a TLM channel >> or beacon? >> >> >> On 07/27/2011 06:54 PM, W4ART Arthur Feller wrote: >>> No need to guess or try to write new definitions. Here are definitions >>> accepted by all administrations around the world and included in the radio >>> regulations: >>> >>> RR 1.125 simplex operation: Operating method in which transmission is made >>> possible >>> alternately in each direction of a telecommunication channel, for example, >>> by means of manual >>> control2. >>> >>> RR 1.126 duplex operation: Operating method in which transmission is >>> possible >>> simultaneously in both directions of a telecommunication channel2. >>> >>> RR 1.127 semi-duplex operation: A method which is simplex operation at one >>> end of >>> the circuit and duplex operation at the other.2 >>> >>> >>> 2 1.125.1, 1.126.1 and 1.127.1 In general, duplex operation and semi-duplex >>> operation require two frequencies >>> in radiocommunication; simplex operation may use either one or two. >>> >>> I hope this helps. >>> >>> 73, art….. >>> W4ART Arlington VA >>> >>> >>> >>> http://afeller.us >>> >>> _______________________________________________ >>> Sent via [email protected]. Opinions expressed are those of the author. >>> Not an AMSAT-NA member? Join now to support the amateur satellite program! >>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >>> >> >> _______________________________________________ >> Sent via [email protected]. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb http://afeller.us _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
