Re: V4 Chat Protocol on 30 Meters?
- Thank you very much Phil, very interesting. For sure I shall follow the development and experience reports.
Have a good xmas time
vy73 Fred DL6XAZ
--- In 30MDG@yahoogroups.com, Phil Williams <ka1gmn@...> wrote:
> The text is sent in frames with a 16 character payload, so this can be an
> issue with QSB at times taking out whole at time where I think Contestia
> would go a better job in this case along with other modes of the same
> The V4 chat protocol can operate in two modes - FEC and ARQ. The ARQ is
> still in development and is not enabled on the version. I would think that
> once ARQ is enabled , that this would improve the robustness of this mode.
> Time will tell. With FEC, one types as the normally would. When you are
> ready to transmit the text, then one would use the Control-Enter key
> With moderate signal levels the mode performs well and as long as the QSB
> are not too deep then it does a good job recovering from QSB.
> The busy detector can be adjusted to avoid transmiting when the freq is
> busy. I tend to set mine at a very conservative level to minimize QRM. The
> drawback of any media access control mechanism is that it assumes all
> stations hear each other, so there are no hidden terminal...difficult on
> HF. I think there is still a lot more experimentation that needs to be done
> with the busy detector. The effectiveness of the busy detector will be
> dependent the scenario. If all stations can hear each other with moderate
> signal levels and if conservative and if conservative busy signal level
> setting a consistent amount the participating stations then it will be
> effective. If stations do not hear each other equally well, then the
> effectiveness of the busy detector will rapidly degrade and operators will
> have to decide for themselves using the establish practices of when to
> transmit or not to transmit.
> The core DSP functions of this mode are still in alpha and the developer is
> focusing his efforts there as he should. The interface is design to
> facilitate this focus and so consideration for enhancements to the interface
> are secondary. This mode runs on a virtual Terminal Node Controller so that
> other developers can create other interfaces without having to be concerned
> about the DSP underpinnings.
> Philw de KA1GMN
> On Dec 23, 2010 10:39 AM, "dl6xaz" <dl6xaz@...> wrote:
> Hi Phil,
> when you got a moment, could you give me some information please about your
> impressions of this mode, especially how it compares to the existing chat
> modes (contestia etc.) I did not hear any QSO here in my area yet.
> Thank you and best season's greetings
> vy73 Fred DL6XAZ
> --- In 30MDG@yahoogroups.com, Phil Williams <ka1gmn@> wrote:
> > I am wondering if there has be...