[pskmail] Re: PSKmail and TransArctic expedition
- From: Олег К <kazz@xxxxxxxx>
- To: pskmail@xxxxxxxxxxxxx
- Date: Thu, 19 Feb 2009 17:23:14 +0300
Per, the disk space is enough, there is a luck of RAM instead. The virtual
memory isn't a problem, but seems not to be a solution here. I have a bit
experience to run VMware under XP on my desktop and will try to do that in the
case if I could upgrade the RAM.
APRS PSK31: the missing of ACKs is unpleasant thing but not so much. Of course,
it's an advantage of PSKmail system, but local air conditions could prevent me
catching ACKs even if they are sent by a server. More serious subject - is
handling the position updates on the server side manually. It seems to be
unproductive. So, I'm waiting for a while for a proper solution here. Simple
java GUI could be such a thing for starting. Rein, from my opinion, the
absolutely necessary points are 1, 2, 3; desirable points are 4, 5, 6.
Concerning GPS. Currently I use GPS "coupler" - Franson GpsGate, which catches
NMEA traffic from one real serial (or usb) port and output it to several
virtual serial ports. So, many applications can use NMEA data from one GPS.
Modem speed. I assumed PSK31 only because it exists in current APRS win
software. In the case of using of fldigi as a front-end, I would follow to
recommendations of PSKmail sysops. We can test several speeds and choose an
appropriate one.
I'm afraid that effectiveness of 2,5m GP on 40m is not much. May be it'll be
interesting to try it during the expedition. The 20m is quite good but 30m has
a more "crystal" air. So, I expect to try 30m and 20m as a working variant.
I'm leaving Moscow for the expedition at the end of March. Depending on Most
High, the journey can take up to 3 months: 1,5 to North Pole and 1,5 after.
Oleg
-----Original Message-----
From: Rein Couperus <rein@xxxxxxxxxxxx>
To: pskmail@xxxxxxxxxxxxx
Date: Thu, 19 Feb 2009 10:45:56 +0100
Subject: [pskmail] Re: PSKmail and TransArctic expedition
> I am working on a java class for the RX... maybe we should aim for a quick
> shot that does:
> 1* read the gps
> 2* auto + manual send APRS posit beacons
> 3* Send APRS messages
> 4* Receive QSL's
> 5* Receive APRS messages
> 6* Receive bulletins
>
> with a very simple GUI (just a few buttons + a terminal like structure),
> and a simple config file holding the client + server calls and the last gps
> data...
>
> That should be very easy and fast to do...
>
> I am working on the guts of 2, 3, 4, 5 and 6, the RX class becomes ready next
> weekend. Need help on the GUI and (1*).
> I think we would need a GUI with 1 textarea for receive, 1 textfield for
> sending message lines , buttons for ping, link and beacon...,
> he next version would then include a drop down list for the servers...
>
> On the subject of bands:
> 40 meters is MURDER because of the qrm...
>
> On the subject of modem speed:
> There are 2 criteria, modem speed and qrm.
> A psk31 message takes 2x as long as a PSK63 message, which doubles the chance
> of qrm.
> In my experience the shorter message length is more critical than the modem
> speed (which sets
> the sensitivity level). Choosing the right time of day has more influence
> than slow modem speed.
> That is the reason why we have chosen to go for faster modem speed and
> shorter message
> length!!
>
> 73,
>
> Rein PA0R
>
>
>
>
> > -----UrsprЭngliche Nachricht-----
> > Von: "Per Crusefalk" <per@xxxxxxxxxxxx>
> > Gesendet: 19.02.09 10:19:26
> > An: pskmail@xxxxxxxxxxxxx
> > Betreff: [pskmail] Re: PSKmail and TransArctic expedition
>
>
> > Hi Oleg,
> >
> > Ok, I understand that available memory imposes these restrictions.
> > If disk space is a problem then you can actually have the virtual box
> > disk on a usb stick, assign very little memory to it (128 megs?).
> > But, just running APRS in PSK31 without the necessary frame start, frame
> > end and CRC etc will make it necessary to handle the position updates
> > manually on the server side. You will not get acks for your
> > transmissions either. I can have a go at the java gui and make it
> > possible to send proper aprs beacons that will be handled automatically
> > by the servers (which means you will be able to get a QSL sent from the
> > server) while you wait for the windows version.
> >
> > When are you actually leaving? How long will you be out there?
> >
> > Also, I have done a few proper predictions for this path and it looks
> > like 40 meters is a better bet than 30. I should have the server watch
> > both bands.
> >
> > 73 de Per, sm0rwo
> >
> >
> > tor 2009-02-19 klockan 00:52 +0300 skrev п п п пЁ п :
> > > Hi Per,
> > >
> > > I thought about virtualbox, indeed. But there is no room for its running
> > > - PIII+512MB. Still trying to update notebook's memory, but it's also not
> > > so easy. eePC won't work in expedition conditions, indeed -
> > > http://www.ec-arctic.ru/photos/view_photo.php3?id=1441,section=24,page=18
> > > So, I'm still stuck on win$ for that journey.
> > >
> > > Well. So, if you don't mind, I would test APRS in PSK31 (UI-View +
> > > PSK31srv) as a "zero" variant. Then, with appearing of PSKmail for
> > > windows (or whatever - fldigi works fine, the only thing - to inject APRS
> > > data into it :o), I would move to PSK62 or PSK250 modes.
> > > Regarding to the bands - I think we would start from standard APRS frq -
> > > 10.147 MHz. In addition to it I can operate in 14 MHz as well.
> > >
> > > I'll use IC-7000 with 100W output (probably 40-50W in digital modes) and
> > > GP 2,5m (short vertical) on the top of the vehicle's roof.
> > >
> > > 73!
> > > Oleg
> > >
> > >
> >
> >
> >
> >
>
> --
> http://pa0r.blogspirit.com
>
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