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

  • From: "Rein Couperus" <rein@xxxxxxxxxxxx>
  • To: pskmail@xxxxxxxxxxxxx
  • Date: Sat, 6 Oct 2012 18:16:26 +0200 (CEST)

... should be possible, but it is a lot of work.

One possibility is to make a Coherent CW modem on the server side, 
and use a simple CW coherizer developed by PA0R in 1976 on the client side.
It consisted of 1 JK-FlipFlop IC, a NE555, a few resistors and 1 x 2N2222 keying transistor...
Its function was to synchronize the output of a straight key to a 
CCW bit stream. I guess you would gain some 20 dB doing that.
We used to work Japan wit 200 mW o  14 MHz.

I remember that a simple CW decoder written in Basic for the ZX81 by N6TR made 80 QSO's 
during the CQWW-CW contest around 1980...


Rein PA0R

Do you think it's possible to create a better cw modem? Something more
intelligent and flexible.

On Sat, Oct 6, 2012 at 8:48 AM, Rein Couperus <Rein@xxxxxxxxxxxx> wrote:
> I did some testing on the CW copying capability of the latest stable fldigi, and I must say I am not very impressed. Something must be done to mimic a 'robust CW' solution, because I got 99% error on most signals.
> Here is SP5KD calling a dxpedition with 20 wpm:
> ---
> E T *I EE ****H *H IE VD T W* I* T 5KD E B V R I I<AS>SEB
> E6 EF5BD D I E SP5KD SIH EET E I EE U SP5KD SSAE E LP5KD
> SP5KT IP5KD ETP5KD E ISP5KDE EDL5KD IP5XSE E D IP5KD E S E
> SER5KD D IP5KD IH HPHCD A* SP5* IP5TTD EPHKD *5KD IW5KD
> EP5KTE G5KD E<AS>5KD IPHKD EW5KD EP5KD E*KH I HKD S** HAS
> S I<VE>5KS IP5BD IP5KD E E E E E E I E E I E E E E E EI T
> ----
> You did not know there were so many ways to spell 1 callsign did you?
>
> Rein PA0R
>
>
> On Fri, 5 Oct 2012 15:53:49 +0200 (CEST)
> "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...
>>
>> 73,
>>
>> 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
>> >
>>
>>
>
>
> --
> Rein Couperus <Rein@xxxxxxxxxxxx>
>


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