The radio will work with the spur reduction on or off. Basically, you can lighten the load on your parallel port and reduce the number of spurs seen by leaving Spur Reduction at it's default ON position.
However, if you have an offending spur in the passband, you may want to try to turn it off to move the spur around. Eric Wachsmann FlexRadio Systems > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > radio.biz] On Behalf Of Jiri Sanda > Sent: Monday, December 05, 2005 1:42 PM > To: flexradio@flex-radio.biz > Subject: Re: [Flexradio] Interesting behavior when connected to a dummy > load > > OK - so if I understand it well one should run it without the reduction > unless there is a problem - a spur audible - and than switching on might > help ? > > 73 ! > > Jiri > OK1RI > > On Mon, 5 Dec 2005, Ahti Aintila wrote: > > > Jiri, > > > > My understanding is that the "spur. reduction" moves the spurious signal > > generated by the DDS away from your listening passband. There is a good > > probability that another spurious signal does not hit the same > frequency. > > > > 73, Ahti OH2RZ > > > > ----- Original Message ----- From: "Jiri Sanda" <[EMAIL PROTECTED]> > > Cc: <flexRadio@flex-radio.biz> > > Sent: Monday, December 05, 2005 7:04 PM > > Subject: Re: [Flexradio] Interesting behavior when connected to a dummy > load > > > > > >> > >> I do not understand ? > >> If the transmitted noise get so much worse when "spur. reduction" is on > >> why is it there at all ? What positive it does ? > >> > >> 73 ! > >> > >> Jiri > >> OK1RI > >> > >> On Mon, 5 Dec 2005, Eric Wachsmann - FlexRadio wrote: > >> > >>> Jeff nailed this one on the head. The jumping around is because when > >>> spur reduction is turned on, the radio hardware is only tuned every > >>> ~3.051kHz. We do the fine tuning using a software oscillator. Also > >>> worthy of note is that we use an 11kHz IF. So what you are seeing is > >>> the junk around DC on the left side of the spectrum. > >>> > >>> > >>> Eric Wachsmann > >>> FlexRadio Systems > >>> > > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
