[amsat-bb] Re: true duplex radios

[Jim Heck]

Hi All,

  In my experience, you dont have to listen to the output channal of a repeater,
while transmitting to its input, ie you dont have to hear your own signals coming
back through the repeater. BUT you do (ideally) when working through a satellite.

  Again im my experience, such a radio as Greg has described is called a "half
duplex" one.

  The big advantage of using a full duplex radio for satellites is that you can
check if you are being rebroadcast by the satellite or not, without relying on
others to tell you. (You can also change the polority of the up link signal, for
maximium smoke!)

73 Jim G3WGM

> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org]On
> Behalf Of Greg D.
> Sent: 02 June 2009 07:12
> To: clintbrad4d at earthlink.net; amsat-bb at amsat.org
> Subject: [amsat-bb] Re: true duplex radios
>
>
>
> {queue thunder clap}
>
> Wait a minute...  How can a radio be capable of cross-band repeat and not
> be full duplex?  I believe the answer is no.  Cross-band (analog)
> repeating is inherently full duplex.  So, perhaps this is a simple way to
> ask a non-satellite person, without having to explain what duplex means.
>
> By the way, my Alinco DR-610 mobile rig is also full-duplex.  You may add
> it to the list.  (In fact, it's got some down-right-weird modes, between
> the two sides of the radio, that it's sometimes anyone's guess what will
> happen when you key up.)
>
> Greg  KO6TH
>
> > From: clintbrad4d at earthlink.net
> > To: amsat-bb at amsat.org
> > Date: Mon, 1 Jun 2009 12:37:16 -0700
> > Subject: [amsat-bb] Re: true duplex radios
> >
> >  >> ... Yaesu FT-8800 ...
> >
> > Really? Dual-receive, indeed. And will perform crossband repeating.
> > But I can transmit on one band and simultaneously hear myself on
> > another with a FT-8800?
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