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Re: [0.1.5.0] Day 1 observations

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  • la7um
    You got me Gert. I have heard the expression, but never knew, or even investigated into how it worked. Thanks for that info:-) 73. de la7um Finn
    Message 1 of 10 , Dec 19, 2010
      You got me Gert. I have heard the expression, but never knew, or even
      investigated into how it worked. Thanks for that info:-) 73. de la7um Finn


      --- In V4Protocol@yahoogroups.com, "OE3ZK" <oe3zk@...> wrote:
      >
      > > Is psk31 ever used arq?
      >
      > Yes, look at PSKmail
      >
      >
      > ----- Original Message -----
      > From: "la7um" <la7um@...>
      > To: <V4Protocol@yahoogroups.com>
      > Sent: Sunday, December 19, 2010 8:04 PM
      > Subject: [V4Protocol] Re: [0.1.5.0] Day 1 observations
      >
      >
      > > Hopefully second line of defence, the arq mode purified, will compensate
      > > sufficiently for that. Is psk31 ever used arq?
      > >
      > > 73. La7um Finn
      > >
      > > --- In V4Protocol@yahoogroups.com, "OE3ZK" <oe3zk@> wrote:
      > >>
      > >> G3NRW wrote:
      > >>
      > >> > 2. Weak signal decoding: My first subjective impression is that weak
      > >> > signal decoding may not be as efficient as I might have expected. Even
      > >> > when I can clearly see/hear weak signals, well above the noise, there
      > >> > is
      > >> > still no decoding.
      > >>
      > >> Absolutely - V4 decoding in WEAK SIGNAL and in QRM/QRN conditions is very
      > >> poor compared to PSK31 decoding in similar condx...
      > >>
      > >> 73
      > >> Gert, OE3ZK
      > >>
      > >>
      > >> ----- Original Message -----
      > >> From: "Ian Wade G3NRW" <g3nrw@>
      > >> To: <V4Protocol@yahoogroups.com>
      > >> Sent: Saturday, December 18, 2010 1:11 PM
      > >> Subject: [V4Protocol] [0.1.5.0] Day 1 observations
      > >>
      > >>
      > >> > [0.1.5.0]
      > >> >
      > >> > I have only been using V4 for a few hours, but a couple of observations
      > >> > immediately come to mind:
      > >> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      > >> > 1. Busy channel: The TNC appears to be much too sensitive to other
      > >> > stations outside the yellow tramlines, to the extent that it defers
      > >> > from
      > >> > transmission when even very weak signals are present a long way
      > >> > (>150Hz)
      > >> > from the V4 center frequency. As a result, transmission is prevented
      > >> > far
      > >> > too often, when there is often clear blue sky at V4 center +/- 100Hz. I
      > >> > think the busy algorithm could be considerably tightened, to only
      > >> > prevent transmission if received signals are less than, say, +/- 120Hz
      > >> > from center frequency.
      > >> >
      > >> > 2. Weak signal decoding: My first subjective impression is that weak
      > >> > signal decoding may not be as efficient as I might have expected. Even
      > >> > when I can clearly see/hear weak signals, well above the noise, there
      > >> > is
      > >> > still no decoding.
      > >> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      > >> >
      > >> > Nevertheless, an interesting mode, and I'm looking forward to further
      > >> > developments.
      > >> >
      > >> > --
      > >> > 73
      > >> > Ian, G3NRW
      > >> >
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      > >> > ------------------------------------
      > >> >
      > >> > Yahoo! Groups Links
      > >> >
      > >> >
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      > >>
      > >
      > >
      > >
      > >
      > > ------------------------------------
      > >
      > > Yahoo! Groups Links
      > >
      > >
      > >
      >
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