Aloha Jeff, Well, I suppose if a new DDS chip is the answer I dont have a problem if the guys at Flex come up with one and I have to spend a few bucks to see the improvement.
It is a great radio but I think this spur problem needs to be put at the top of the pile and resolved somehow. Stan AH6JR On Sunday 11 December 2005 04:17 am, Jeff Anderson wrote: > Spurs are worse near frequencies which are an integral divisor of 200 MHz, > plus the IF frequency. Spur reduction alleviates the problem, but does not > eliminate it. > > For example, spurs are terrible around 50.011025 MHz (but not at the > *exact* frequency of 50 MHz + IF). 50 MHz is 200 / 4. > > Let's take another integer divisor: 7. > > 200 / 7 = 28.57142857(...) MHz. Add to 11.025 KHz and you get 28.582(etc.) > MHz. And the spurs are terrible in this range, too. And although > spur-reduction allieviates the problem, it unfortunately does not cure it. > > When I received my SDR1K (about a month ago), these spurs were the most > obvious problem with an otherwise great radio. Unfortunately, I think it > will take a hardware change (new dds chip and...?) to reduce them - I > think software's done about as much as it can do. > > - Jeff, WA6AHL > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Stan > Sent: Sunday, December 11, 2005 12:00 AM > To: Tim Ellison > Cc: FlexRadio@flex-radio.biz > Subject: Re: [Flexradio] Spurs on 10 meters > > > Theres a very small spur at 28.700 there are a few at up and down from > 28.707 > Same with 28.711 - up and down from 28.727 > Basically there a quite a few all over 10 meters but the worse are at > 28.580 to 28.585 > > Stan > AH6JR > > On Saturday 10 December 2005 05:16 pm, you wrote: > > Stan, > > > > Do you see little spurs at 28.700 with Spur Reduction on as well? > > > > -Tim > > --- > > Tim Ellison ( [EMAIL PROTECTED] ) > > Integrated Technical Services ( http://www.itsco.com ) > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Stan > > Sent: Saturday, December 10, 2005 9:02 PM > > To: FlexRadio@flex-radio.biz > > Subject: [Flexradio] Spurs on 10 meters > > > > While tuning around 10 meters today I came across the worst case > > of spurs I have ever seen on any radio. From 28.580 to 28.585 is > > nothing but spurs. Turning off the spur reduction makes it even worse. > > > > This 5khz is not usable for me. Its totally destroyed by the spurs. > > > > Anyone else seeing this or have I got a problem with this radio. > > > > Stan > > AH6JR > > > > > > _______________________________________________ > > FlexRadio mailing list > > FlexRadio@flex-radio.biz > > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > -- > He is your friend, your partner, your defender, your dog. > You are his life, his love, his leader. He will be yours, > Faithful and true, to the last beat of his heart. You owe it > To him to be worthy of such devotion. > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > > > _______________________________________________ > FlexRadio mailing list > FlexRadio@flex-radio.biz > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz -- He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, Faithful and true, to the last beat of his heart. You owe it To him to be worthy of such devotion.
