> Years ago, MMTTY for FSK assumed USB reception for polarity. > If guys were trying to receive your FSK signal on LSB, it was > inverted.
MMTTY handles FSK on LSB just fine and has done so nearly forever. It simply requires one set the mark to 2125 and - assuming one is using an interface with open collector transistor FSK output - configuring the transceiver so that Mark represents a low (closed) on the FSK input. It is a shame that so many authors of digital software are simply too lazy to support operation on either sideband and ignore the long history of LSB for AFSK. Use of USB as a "standard" sideband for digital modes is only an artifact of the software that does not work with LSB. 73, ... Joe, W4TV > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Brian Alsop > Sent: Saturday, August 23, 2008 11:55 AM > To: [email protected] > Subject: Re: [Elecraft] Which sideband on data mode? > > > I don't know if it is still the case. > Years ago, MMTTY for FSK assumed USB reception for polarity. > If guys > were trying to receive your FSK signal on LSB, it was > inverted. There > was no software switch to invert the polarity either. > > Perhaps this has been resolved by now. > > 73 de Brian/K3KO. > > Simon (HB9DRV) wrote: > > > In Europe at least I only see USB for RTTY - but don't > watch too much > > RTTY anyway. > > > > Simon Brown, HB9DRV > > www.ham-radio-deluxe.com > > > > ----- Original Message ----- From: "R. Kevin Stover" > > <[EMAIL PROTECTED]> > > > > The "standard" is USB for digi modes like PSK, MFSK, all the others > > except RTTY. The convention for RTTY is LSB The K2 will do > either USB > > or LSB. Technically it doesn't really matter. A PSK signal > sent with > > USB can be decoded with LSB and visa versa. _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
