[pskmail] Aw: Re: Re: A crazy/stupid idea

  • From: "Rein Couperus" <rein@xxxxxxxxxxxx>
  • To: pskmail@xxxxxxxxxxxxx
  • Date: Sat, 6 Oct 2012 11:06:01 +0200 (CEST)


you can run a telnet session on HF with any pskmail client.
Just choose any pskmail server you can reach and start the telnet 
session with Ctrl-T.
See the screenshot...

Rein PA0R

Funny, I was thinking about a similar idea ut for a very different purpose. My goal was to run very slow Telnet sessions on any HF-protocol, like these VT terminals we had in the 80s.

The implementation would have been to use any fldigi modem by wrapping them in a Hayes-compatible serial port, so that any modem could be used, with any software plugged on a tty modem.

One of the difficulties would indeed have been to devise a simple protocol to send/receive non-alphanum characters such as '@', '<SOH>' etc...  with Morse or Baudot, so that even PPP could run on this serial port. A simplistic solution would be to use strings such as " at ", and if these strings appear in the text to transmit, just escape them. This is an ultra-classical solution.

Another problem is to implement a simple protocol for error detection, such as asking for the retransmission strings, or maybe substrings only. For my personal need, it does not have to be fast (75 bauds or 50 bauds are perfect) so retransmitting is OK.

On Fri, Oct 5, 2012 at 2:53 PM, Rein Couperus <rein@xxxxxxxxxxxx> wrote:
Being a 'CW only' operator, this idea has been one of my pet projects for some 
years... I am thinking about a 'simplified' way to handle this, not a full ARQ 
protocol. I must admit that it is not highest on the todo list, but I might come up 
with some useable code next winter season...

Some ideas which are on my 'would be nice' list:
* Use a Coherent CW modem for a super sensitive link mode on a frequency 
in the CW portion of the band, running slow but full ARQ pskmail...
Using multiple CW characters to form the complete ASCII 7 set...

* Theoretically you could now already send short emails without ARQ connect
using the unconnected APRS email service in pskmail... just switch fldigi to 
receive CW... (only trouble are the '@', '<SOH>' and '<EOT>' characters...).

* A separate version of PSKmail called 'CWmail' could use 90% of the pskmail
system infrastructure with a specialized protocol, and run in the CW band.

*ARQ by ear... using your keyer to ask for a repeat...

... Meanwhile you can of course use Andpskmail without a laptop using your 
android phone... makes your backpack a lot lighter in weight :-)

One other idea I have to make the transceiver smaller and lighter is 
to use a straight FSK mode on an Xtal controlled transmitter...

I will take a few extra beers tonite, and do some more thinking :-)

To realize all these goodies we will need some coding help (Perl for the server),
as the pskmail project is not finished yet...


Rein PA0R

I love the idea to get portable operators connected!

vy 73 de Marcus KD0JKM

Sent from my Mobile, please excuse typos.
Phone: 314 884 8697

On Oct 5, 2012, at 7:30, Daniel Arseneault <danielarseno@xxxxxxxxx> wrote:

> Hi guys,
> Just for the sake of discussion, what would you think of adding an
> amazing new mode to pskmail: CW.
> Actually, I'm serious. I'm thinking of a CW-to-email gateway that
> would listen for keywords and message body text sent in CW. This would
> allow mobile ops who can't pack a laptop and ssb transceiver to send
> and receive short emails. Error-correction would be to simply play
> back the email address and message, one line at a time waiting for ok
> confirmation from the client. Full QSK servers could receive
> corrections simultaneously as the message is played back, There could
> be address books, custom abbreviations, heck even webpage fetching
> (short webpages...), there are all kinds of possibilities. All of this
> done live between a human and a computer.
> Here's another discussion on this topic:
> http://www.eham.net/ehamforum/smf/index.php?topic=77975.0

Attachment: tlnet.png
Description: PNG image

Other related posts: