[dxlab] RE: [RTTY] New contesting PSK faster than RTTY

[Dave Bernstein]

As usual, there's the short-term solution and the long-term solution.

The short-term solution is to externally switch the contents of
PSKCORE.DLL as Skip suggests; the only change required in WinWarbler is
the addition of a PSK63 checkbox  that triggers compensation for the
frequency reporting defect -- about 15 minutes work, most of which is
the mechanics of cutting a release.

The long-term solution is to register the PSK63 version of the DLL with
a unique name and modify WinWarbler to use the correct DLL for each
mode, much as it currently switches between PSKCORE and the MMTTY
engine. Since both PSK DLLs use the same API, it shouldn't take more
than an afternoon to accomplish this, not counting the time required to
scare up a test QSO.

    73,

         Dave, AA6YQ


-----Original Message-----
From: rojomn [mailto:rojomn at charter.net] 
Sent: Sunday, May 04, 2003 11:10 PM
To: Dave Bernstein; rtty at contesting.com; dxlab at yahoogroups.com
Cc: aa5au at bellsouth.net; 'Richard Ferch'
Subject: [dxlab] RE: [RTTY] New contesting PSK faster than RTTY


I bet with the number of users here that interest would pick up quickly
but I am told there is no easy way to switch modes quickly to this
PSK63. Until that interface is available I doubt your effort would be
utilized as in a contest speed of choice is paramount. OTOH if the dll
has the proper interface then I bet may would use it. Unfortunately I
assume it would take some more work on Warbler to present the new mode?

> -----Original Message-----
> From: rtty-bounces at contesting.com 
> [mailto:rtty-bounces at contesting.com]On
> Behalf Of Dave Bernstein
> Sent: Sunday, May 04, 2003 10:02 PM
> To: rtty at contesting.com; dxlab at yahoogroups.com
> Cc: aa5au at bellsouth.net; 'Richard Ferch'
> Subject: RE: [RTTY] New contesting PSK faster than RTTY
>
>
> WinWarbler utilizes PSKCORE.DLL as its PSK engine. If there is serious

> interest in exploring PSK63, I can quickly release a version that 
> compensates for the  "freq/2" defect mentioned below. Let me know...
>
>     73,
>
>        Dave, AA6YQ
>
>
> -----Original Message-----
> From: rtty-bounces at contesting.com [mailto:rtty-bounces at contesting.com]
> On Behalf Of Richard Ferch
> Sent: Sunday, May 04, 2003 9:57 PM
> To: rtty at contesting.com
> Cc: aa5au at bellsouth.net
> Subject: Re: [RTTY] New contesting PSK faster than RTTY
>
>
> On Sun May 4 20:07:23 EDT 2003, Don Hill AA5AU said:
>
> > I'd be willing to try it, but it's still going to be AFSK.  Where do

> > we get the software?
> >
> > AFSK - if I wanted to send audio to my radio, I'd go hunt for my 
> > microphone...
> >
> > RTTY Forever,
> > Don AA5AU
>
> Hi Don,
>
> It's basically the same as PSK31 except at twice the speed (and 
> therefore twice the bandwidth). So far, the only code I have seen for 
> it is in KH6TY's experimental version of the PSKCore.dll file at 
> http://www.qsl.net/kh6ty/psk63/ - the actual file is at 
> http://www.qsl.net/kh6ty/psk63/psk63core.zip .
>
> In addition to the dll itself, you need a PSK program that uses the 
> PSKCore dll. I could be wrong, but I don't think WriteLog is one. 
> Those that I am aware of includeWinPSK 
> (http://www.qsl.net/ae4jy/winpsk.htm),
> WinPSKse
> (http://www.winpskse.com/) and Zakanaka
> (http://www.qsl.net/kc4elo/oldfiles.htm) plus several others (I can
give
> more links if anyone is interested). Many of these programs do not
have
> much in the way of contesting features (one exception being RCKRtty),
> but they can be used to test the characteristics of the mode.
>
> KH6TY's recommendation for using the new file is to keep two copies of

> your chosen PSK program in separate folders, one with the original 
> PSK31 PSKCore dll and the other with the new PSK63 version of the dll.

> An alternative method would be to place two renamed copies of the dll 
> (e.g. pskcore31.dll and pskcore63.dll) in the same folder with the 
> software, and create a couple of little batch files to delete the old 
> pskcore.dll file and make a copy of the required one and name it 
> pskcore.dll, then start the PSK software.
>
> One small "bug" to watch out for - the original PSKCore dll returns 
> the audio frequency, but the new experimental one returns the 
> frequency divided by two (I guess you can figure out from this how the

> new version works!). This means that the waterfall in the PSK software

> is compressed, and you will have to zoom in one step more than you 
> would in PSK31.
>
> So far the two QSOs I have had in this mode were somewhere around 
> 14074.3 kHz true frequency - one with KH6TY (in SC) and one with 
> PJ2MI. My radio dial was set around 14072.9 in USB, and the reported 
> audio frequency was about 700 Hz (actually 1400). I haven't heard 
> KB2EOQ yet, but that's not too surprising on 20 meters - we're in each

> other's skip zone. Yep, here W5BBR is in a PSK63 QSO with KB2EOQ on 
> 14074.4 - Bill has a strong signal here, but I can't see any sign of 
> Andy at all.
>
> Yes, it's AFSK, so you have to watch out for overdriving (no ALC 
> indication, sound card output level not too near the top). OTOH, it's 
> faster than RTTY (around 100 wpm, more or less - the characters are 
> variable length, so it's hard to be precise), and it occupies less 
> bandwidth (nominally 63 Hz). It will be interesting to see whether it 
> actually works out. I wouldn't expect it to have much impact on 
> existing PSK31 ragchewing, because most hams cannot type fast enough 
> to justify the increased bandwidth over PSK31. For contesting and 
> DXing, where you can rely almost completely on macros, it seems to 
> have more promise. Certainly the idea of fitting several QSOs into the

> same bandwidth as a single RTTY QSO without giving away anything in 
> speed is an interesting one.
>
> Besides, Don, this way you can actually make use of the USB mode on 
> your radio without having to find your microphone (gee, I know one of 
> those things came with my radio, but I'm darned if I know where I put 
> it!). I suspect this mode will be most interesting to people who can 
> use narrow filters in USB or LSB mode. If your radio insists on making

> you use wide filters in SSB, it might not be quite so attractive.
>
> 73,
> Rich VE3IAY
>
>
>
>
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