Ah yes, sorry, I'd forgotten what you said about nearby strong signals. It happens just the same with the antenna disconnected and replaced by a 50 ohm terminator so I guess this can't be the explanation. But I will try what you suggest about injecting a strong signal and looking for clicks nearby.
In the meantime, I'm just about to order a better parallel cable and see if that fixes it. Thanks, Jack On 23 May 2006, at 09:55, Peter Martinez wrote: >> From G3PLX: > > Jack said: > >> If the cable isn't to blame and this is DDS tuning - as Eric seems to >> suggest - then perhaps Peter's comments on linear tuning of the >> AD9854 hold an answer. But if DDS tuning is the cause, why is it >> frequency dependent? > > DDS tuning clicks should ONLY occur if there's a big signal nearby. > If you > do have big birdies on the higher bands (I get them every 1MHz, > from other > things in the shack), then you may get these clicks worse because > of this, > especially if the noise level is lower. Try injecting a strong > signal lower > down the band where you don't normally hear the clicks, and see if the > clicks then appear near that. > > I only just thought of the linear sweep idea. Maybe someone like > Eric or Bob > might follow it up. Only they could say if it would be easy to do > in the > supplied software. I have used the linear sweep feature of the AD9854 > myself, for following Chirpsounders up the spectrum at 100kHz/sec, > but not > for tuning steps. > > 73 > Peter > > > _______________________________________________ > FlexRadio mailing list > [email protected] > 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 [email protected] 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
