[amsat-bb] Re: simplex/duplex terminology

[W4ART Arthur Feller]

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" <nigel at ngunn.net> 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
>>> 
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>> 
>> _______________________________________________
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