Fw: [softrock40] Re: DDS-60 and Softrock V5 - Spurs
- Can you, N3HKN, describe what you see relative to the DDS spurs ? Is that across the whole 20m ? qty 10 20dB spurs at frequency x-y, no spurs between frequency a-b, etc. Just a rough idea if what you are dealing with.73 Kees K5BCQ----- Forwarded Message -----From: "mikezingman" <mikezingman@...>Date: Tue, 28 Feb 2006 03:39:05 -0000Subject: [softrock40] Re: DDS-60 and Softrock V5 - SpursMessage-ID: <email@example.com>
I measure 0.8v P-P on my 20 meter BPF board, so I suspect that you
should be able to drive it with the DDS-60. I am in the process of
doing exactly the same thing as soon as I build up a new BPF minus the
As far as the spurs, quite a lot has been done based on the
information in the Analog Devices white papers on the subject and then
translated into code by Bob, N4HY. Refer to section 4 in this link:
--- In firstname.lastname@example.org, "n3hkn" <n3hkn@...> wrote:
>PIC-EL/DDS-60 as a VFO for my 20 meter V5 QSD. Works well
> I also posted on QRP-L...
> I have my
> except for thespurs. I run the V5 from a small battery to eliminate
> any pasty paththat way. However, on some frequencies no spurs in a
> 48khz bandpasswhile on others total spurs end-to-end. Mostly I can
> position a stationbetween spurs but this is a bit awkward.
>has been discussion on the spurs issues. Has
> So, I know that there
> anyone come up with somesolutions that reduced the number/amplitude
> of the spurs? As an example,does putting either the PIC-EL or the
> Softrock V5 in a case do anygood?? DDS-60 connected to Pin-4 of the
> header via 6 inches of RG-174.No components on the OSC/BPF board are
> connected to Pin-4. Ground toPin-7.
>DDS-60 is 2V P-P.
> One other issue is that the max I can get from the
> Is this enough?Boley N3HKN