[amsat-bb] Re: PSK v. APRS

Nigel Gunn G8IFF/W8IFF nigel at ngunn.net
Wed Jun 8 06:33:56 PDT 2011

Traditionally, a simplex channel is one that can ONLY receive or transmit but not both, as in a telemetry beacon or a 
broadcast radio or TV station.
Half-duplex refers to a channel where both reception and transmission can take place but only one at a time. Your 
operation of an FM repeater, for example, is half-duplex although the repeater is actually operating full-duplex on two 
Full-duplex refers to a system that receives and transmits simultaneously. A wired telephone and cellphone come into 
this catagory as does nost peoples use of a lineat satellite transponder.

On 08-Jun-11 03:33, Justin Pinnix wrote:
> Guess I learned the ITU version :-)
> http://en.wikipedia.org/wiki/Simplex_communication
> On Tuesday, June 7, 2011, Nigel Gunn G8IFF/W8IFF<nigel at ngunn.net>  wrote:
>> That's half duplex, not simplex.
>> On 07-Jun-11 14:55, Justin Pinnix wrote:
>> A packet satellite can also be operated simplex (TX and RX on the same
>> frequency).

Nigel A. Gunn,  1865 El Camino Drive, Xenia, OH 45385-1115, USA.  tel +1 937 825 5032
Amateur Radio G8IFF W8IFF (was KC8NHF 9H3GN),  e-mail nigel at ngunn.net       www  http://www.ngunn.net
Member of  ARRL, GQRP #11396, QRPARCI #11644, SOC #548,  Flying Pigs QRP Club International #385,
            Dayton ARA #2128, AMSAT-NA LM-1691,  AMSAT-UK 0182, MKARS,  ALC, GCARES, XWARN, EAA382.

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