Jack, Now we're getting somewhere. :) What you are hearing is the DDS retuning. When this happens, you get a glitch in the audio. The reason you only hear it every 3.051kHz when Spur Reduction is on is because we only retune the DDS every 3.051kHz in that algorithm (fine tuning is done in software). When Spur Reduction is off, we retune the DDS with each and every change to the VFO.
Eric Wachsmann FlexRadio Systems > -----Original Message----- > From: Jack Weber [mailto:[EMAIL PROTECTED] > Sent: Monday, May 22, 2006 5:14 PM > To: [EMAIL PROTECTED] > Cc: FlexRadio@flex-radio.biz > Subject: Re: [Flexradio] Tuning Clicks > > Eric, > > Thanks for your response. > > Since I sent my last email, I've checked this out some more and what > I find is that the click occurs on every 1 kHz step with Spur > Reduction OFF and every 3 kHz with Spur Reduction ON. If I reduce the > step to 100 Hz it happens at those same frequency intervals. So, it's > definitely not coming from the mouse wheel but seems to be connected > with the DDS? > > The effect is frequency dependent, but my observation of it becoming > noticeable above 24 MHz was probably related to atmospheric noise > levels. With no antenna, the clicks become noticeable above about 7 > MHz, but are not audible below that. They occur with all mode and > filter settings (though the actual sound is modified somewhat). > > Jack > > > > > > On 22 May 2006, at 18:47, Eric Wachsmann - FlexRadio wrote: > > > I haven't heard of this particular issue. Are you sure it is > > frequency > > dependant, or could it be happening on other bands but it just sounds > > different because of the mode/filter selections? > > > > > > Eric Wachsmann > > FlexRadio Systems > > > >> -----Original Message----- > >> From: [EMAIL PROTECTED] [mailto:FlexRadio- > >> [EMAIL PROTECTED] > >> radio.biz] On Behalf Of Jack Weber > >> Sent: Friday, May 19, 2006 8:18 AM > >> To: FlexRadio@flex-radio.biz > >> Subject: [Flexradio] Tuning Clicks > >> > >> If my SDR-1000 is tuned above about 24 MHz, I get a loud click at > >> every step when tuning with the mouse scrollwheel. Below 24 MHz > >> scrollwheel tuning is silent. Is this normal? It's a Microsoft USB > >> mouse, BTW. > >> > >> Thanks for your help, > >> > >> Jack > >> > >> _______________________________________________ > >> FlexRadio mailing list > >> FlexRadio@flex-radio.biz > >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > >> Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex- > >> radio.biz/ > >> FlexRadio Homepage: http://www.flex-radio.com > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
