PSK31 is a nice system to replace TTY. But this form of Phase modulation is nothing new. We used it for disk drive encoding in the 60s and I belive it was actually invented during WWII. I think is was called "Harvard Code". And "Manchster Code" was 2F modulation.
Bob Macklin K5MYJ/7 Seattle, Wa. "REAL RADIOS GLOW IN THE DARK" ----- Original Message ----- From: <[EMAIL PROTECTED]> To: "Discussion of AM Radio" <amradio@mailman.qth.net> Sent: Saturday, February 19, 2005 4:28 PM Subject: Re: [AMRadio] Re: [BULK] GB> HD-15 PSK Interface > Bob, I know what you mean.. Its kinda spookey watching the words come out on the display and you cant hear anything.... Got to burn paper tape and spread the little holes on the lawn -- apease the Old Ones . I dont have any virgins to sacrifice... kevin.. > > ----- Original Message ----- > From: Bob Macklin <[EMAIL PROTECTED]> > Date: Thursday, February 17, 2005 2:16 pm > Subject: [AMRadio] Re: [BULK] GB> HD-15 PSK Interface > > > I don't seem to have a problem with the signal level going in to > > the sound > > card. On strong signals WinPSK tells me to reduce the input level. > > But with > > this setup I am able to receive PSK signals I cannot hear in the > > stationspeaker. > > > > Bob Macklin > > K5MYJ/7 > > Seattle, Wa. > > > > "REAL RADIOS GLOW IN THE DARK" > > > > ----- Original Message ----- > > From: "Bob Roehrig" <[EMAIL PROTECTED]> > > To: "Bob Macklin" <[EMAIL PROTECTED]> > > Cc: "GlowBugs" <[EMAIL PROTECTED]>; "AM Radio" > > <amradio@mailman.qth.net> > > Sent: Thursday, February 17, 2005 10:29 AM > > Subject: Re: [BULK] GB> HD-15 PSK Interface > > > > > > > On Thu, 17 Feb 2005, Bob Macklin wrote: > > > > > > > I commected the Rx transformer with the 8ohm winding to the > > speaker and > > > > the 500ohm winding going to the sound card LINE IN. > > > > > > > > I can copy PSK QSOs that I cannot even hear. I am very > > impressed with > > this > > > > technology. > > > > > > You are getting quite a voltage step-up with that arrangement. > > You will > > > get more than enough level into the sound card that way. I would > > be a bit > > > worried about overdoing it and maybe wiping out the sound card input > > > circuit. > > > > > > > > > > > > Bob Roehrig > > > Aurora University Telecom dept. > > > [EMAIL PROTECTED] 73 de K9EUI > > > 630-844-4898 fax 630-844-4222 > > > "Nostalgia is a thing of the past" > > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: AMRadio@mailman.qth.net > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net >
