From: Jorge Matias (jme@septentrio.com)
Date: Thu Mar 15 2001 - 13:08:47 EET
On Wed, 14 Mar 2001, Shane Deering wrote:
> Hello Jorge,
>
> > On Wed, 24 Jan 2001, Shane Deering wrote:
> >
> > > > I tried the following: 2 computers, Pentium/133 and Pentium
> Celeron/450
> > > > Linux Windows
> > > > Linux AX.25 FlexNet
> > > > EPPFlex/76k8 EPPFlex 76k8
> > > > Directly connected with radios
> > > >
> > > > Full Duplex Mode: 7.0k/sec
> > > > Half Duplex Mode: 4.5k/sec
>
> Have you tried this with Flexnet32?
Well, I have tried with the usual FlexNet. At that time there wasn't EPP
drivers for te EPPFlex Modem. I don't know if there are alrady.
> On the Baycom site there seems to be two diferent EPP modems.
> A single piece one and a two piece one. I think you are using
> the single piece one.
When I bought the 2 PCB I saw the FPGA version of EPP Modem only.
Everything is in one single PCB, but there is a connection in the PCB for
an external modem like DF9IC or DK9RR commonly used in USCC cards.
> We are look at doing something along those lines here.
> Could you tell me why you chose the one you did. We are a long
> way from anywhere here and don't have easy contact with anyone
> using that gear.
If you are about to used a modem like this, if I was in your position I
would wait for USB version of that modem, because you will use the modem
with much less CPU use. The EPP drains CPU because it is connected in a
parallel port.
There's another problem. The EPP implementation of some motherboards will
give you problems.
> Also have you put it on air yet and if so I wonder what type of
> radio gear you used. We have found some designs, but may end up
> designing something new based on a 23cm transverter one of the
> locals is designing ( diode switched and stable enough for SSB).
I have put it on the air with ATV transmistters and satellite dish
receivers, transporting the signal in the Video Line.
But I have built a 23cm TX and 23cm RX with 200kHz Bandwidth each,
called WBFM (Wide Band FM). The TX is working but the RX it is still not
100%.
I think you will like the ATV TX/RX solution because if have enough
Bandwidth for Modems that go up to 2.5Mbps FSK.
Anyway, you have to know that if you want to put up and long distance
connection it is preferable WBFM TRX because the same Output Power is put
only in those 200kHz which will give the same S signal at longer distances
than the ATV TX.
> Although it would be cheaper and faster to use wireless LAN cards
> and very big antennas :-)
I really don't know if it is cheap. It depends a lot in the distance of
the link.
> > > I would still like to hear from anyone using the KISS driver to
> > > see what sort of throughput they can get.
> >
> > When I get some time I will test, if I remember, a KISS connection
> > between 2 computers and I'll report the performances in this list.
>
> Have you had a chance to do the test. I'm not getting any better at
> 56kb than I would with 9.6kb. Seems to be software bogging down.
> It would be nice to know it was the extra overhead of using KISS that
> was slowing things down before doing too much ($) on on air gear.
I have still not done that test yet.
Best Regards,
Jorge (CT2HBZ)
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