Re: [sarex] Why FULLDUPE On is good? (Re: iss)

["PE1RDW (Andre)" <aprs@xxxxxxxxxxxxxxx>]

On Mon, 16 Apr 2001, Yoshihiro Imaishi wrote:

> Hello all. This is Yoshi.JF6BCC.
> 
> At 2001/04/15 08:26:58 Vince Fiscus, KB7ADL wrote:
> > ...  The first thing they need 
> > to do right after they enter a proper callsign is change their TNC to 
> > full-duplex so it won't wait for the frequency to clear before it transmits 
> > a valid packet.
> 
>   I saw some articles on this list same as above. But I could not
> understand the advantage of FULLDUPE ON.
> 
>   I understand that the FULLDUPE ON means - can send packets during
> receiving, and can receive packets during sending. So if the ISS
> is operating with Cross-band mode duplex operatable system, it will
> works good.
>   But the rig on the ISS is just a handy simplex transceiver. If
> the TNC run with FULLDUPE ON, ISS will re-transmit the packet as
> soon as the first frame was decoded. Thats means the second or following
> frames/packets will not be received. And, during iss sending the
> packets, ISS can not hear any packet due to the receiver is not
> working.
> 
>   So waht is the advantage of FULLDUPE mode on ISS ?  Is there any
> good reason to choice it?
> 
> de Yoshi JF6BCC.
> 
If you ever heard a pass over europe you might see the use of it, we have
passes where there are periods of several minutes where iss can't tx
becouse there is activity on the input.
In those periods there are usualy only a few good frames because poeple
will try harder to get true (more power and more frames) resulting in
mayhem. 
> - -
> Yoshihiro Imaishi $B:#@PNI42(B - $BJ!2,8)KL6e=#;T(B
> JF6BCC, KH2GR (ex. T88J, T88IY, V63BP)
> jf6bcc@jarl.com or jf6bcc@jamsat.or.jp
> <http://plaza16.mbn.or.jp/~palau/> 
> - -
> $B$3$NEE;R%a!<%k$O(B100%$B:F@8EE;R$r;HMQ$7$F$*$j$^$9!#(B:-)

73 de Andre PE1RDW
aprsdigi co-ordinator Netherlands
member aprs workgroup netherlands
mailto:pe1rdw@aprsnl.org

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