Message-ID: <36EA726F.F30D4921@sault.com>
Date: Sat, 13 Mar 1999 09:13:03 -0500
From: "Rod Mayward" <rodbarb@sault.com>
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: Re LF Xtal/mixer Exciters/Synthesizer (Repost)
References: <199902221144_MC2-6B62-CA30@compuserve.com>
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Hi Geri
Where did you locate the second kit/ memory and dispay units and how did you
divide the freq down to LF?
Thanks
Rod
KL7RG/8

'Geri' Kinzel, DK8KW wrote:

> >Dear Geri,
>
> >Care to share with us the source of the kit?
>
> >73's ................. Zim ............ VK3GJZ
>
> No, Zim, I don't mind at all! Thats what I try since several days! I will
> try again:
>
> The synthesizer I am using is either available as a kit (see below) or as a
> build and assembled unit. It makes use of an integrated DDS circuit named
> AD9850.
>
> There are a couple of information sources available for the AD9850.
>
> The Analog Devices AD9850 is a CMOS, 125 MHz complete direct digital
> synthesiser on a single chip. It uses a single 5 V or 3.3 V supply, and
> with a 125 MHz clock, can generate a low-distortion sine wave or a square
> wave, from under 1 Hz up to about 60 MHz, with a tuning resolution of
> 0.0291 Hz. Full data on the device is available from ADI's web site:
>
>                                         http://www.analog.com
>
> Off course, this device was never created for low-frequency, however, I got
> hold of a kit that includes a controller and a display, it has one Hertz
> resolution and ten memory channels and so it is ideal to drive a
> longwave-PA. It even has a build in correction factor for frequency
> stability, so once you found out how many ppm you are away from the qrg
> where the device should be, you can program that permanently into the
> memory. This allows a freqency stability and repeatability of around 1 Hz