The biggest problem I'm having is tuning in weak signals and copying through QRM. .......!
That looks like rtty to me ! , its a well used mode but its prone to noise etc ... try the newer psk31 mode , digipan or fldigi is about as good as it gets ..nice and simple ..but very good performance . tune with the mouse .. one click and the jobs done ... unless you are keying the tx via a 'genuine' line 'fsk' input .. in which case , your limited to packet , rtty , amtor fec/arq and packtor arq/fec , mmtty will key direct, but for packet amtor/pactor you need a tnc - pk232 etc oddly enough along with my usb sound card acting as pc interface .. , the pk232 is still wired in ! even had a amtor/arq qso a few weeks ago ! but the software modems do out perform the pk232 on rtty .. most notable is the 5 mhz band .. where very often the pk232 dosent print a thing and the software is 100% copy good luck ... G .. --- In [email protected], John Becker <[EMAIL PROTECTED]> wrote: > > I've been a ham for almost 50 years, but I never operated RTTY until > about two weeks ago. It was an award offered by the Chinese for working > their special event stations for the Beijing Olympics that was the catalyst. > > I'm using a KAM connected to an FT-1000MP Mk.V and the WinWarbler > program from the DX Lab Suite. I'm using 500Hz filters, and using the > shift and width controls to narrow the passband from there. My 250Hz > filters seem to be too narrow and I'm not sure why that is. The biggest > problem I'm having is tuning in weak signals and copying through QRM. > > I have a couple of books on RTTY dating back to the 1960's. They talk > about using TU's that can decode with only the mark or only the space > signal. This seems pretty straightforward, since the mark and space > together provide 100% redundancy. I haven't figured out how to do that > with what I'm running, and on weaker signals I'm finding a tuning error > of only 10Hz can make the difference between copy and no copy. > > What do I need to do better? Are there any good recent books on RTTY? I > have the ARRL HF Digital Handbook, but it only covers the basics. Thanks! > > 73, > > John, K9MM >
