Re: LF: Re: 475kHz crystal

["Graham" <g8fzk@g8fzk.fsnet.co.uk>]

> From the  mfg  web-site , seems  to  be  pc based  support  software ? 
could  not  this be  used to  run the  'dds  demonstration kit'   directly 
?
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From: "Minto Witteveen" <minto.witteveen@gmail.com>
Sent: Tuesday, January 08, 2013 8:42 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: Re: 475kHz crystal

> Hi Graham,
>
> It is possible to use the parallel port of a PC to control the DDS, the 
> DDS has a 3-wire SPI interface. See for instance: 
> http://www.qsl.net/p/pa3ckr//signalgenerator/ . Here you will find 
> (amongst a lot of other info) a VB program to control the DDS 
> (http://www.qsl.net/p/pa3ckr//signalgenerator/prad9850.zip). But be 
> prepared to re-install W95 or possibly DOS because it will not work with 
> newer versions of windows….
> Using a PIC is the easiest method I think.  Andy already beat me to it, 
> see his earlier reply to my mail. If you do not want to make a PCB you can 
> even build it using a prototyping breadboard.
> Minto pa3bca
>
>
>
>
> --------------------------------------------------------------------------
> Ceterum censeo Carthaginem delendam esse
> -----Original Message----- 
> From: Graham
> Sent: Tuesday, January 08, 2013 21:16
> To: rsgb_lf_group@blacksheep.org
> Subject: Re: LF: Re: 475kHz crystal
>
> Minto
>
> Is it possible to communicate  with the  DDS  from the  PC  for  a  simple
> VFO or  need  the  pic  ?
>
> G.
>
> --------------------------------------------------
> From: "Minto Witteveen" <minto.witteveen@gmail.com>
> Sent: Tuesday, January 08, 2013 6:46 PM
> To: <rsgb_lf_group@blacksheep.org>; <rsgb_lf_group@yahoogroups.co.uk>
> Subject: LF: Re: 475kHz crystal
>
> > Or, as long as you are going to use a PIC anyway, order a AD9850 DDS 
> > module from buyincoins.com. This 0-40MHz DDS costs less than $5 
> > (including shipping). Add a cheap PIC, a $5 2x16 LCD and a rotary encoder 
> > (or use your PC to communicate with the PIC) and you can generate any 
> > frequency you want. And use the PIC to generate Opera, wspr, qrss.
> > My next project. I already have all the components….
> >
> > Minto pa3bca.
> >
> >
> >
> >
> > --------------------------------------------------------------------------
> > Ceterum censeo Carthaginem delendam esse
> > -----Original Message----- 
> > From: Klaus Hirschelmann
> > Sent: Tuesday, January 08, 2013 12:00
> > To: rsgb_lf_group@blacksheep.org
> > Subject: Re: Fw: LF: 475kHz crystal
> >
> > Hi Pete and group
> >
> > > > maybe we can bring http://www.hanssummers.com/ for also offering 
> > > > 630m-Band versions of his QRSS and WSPR kits.
> > > He doesn't seem to have taken MF on board as far as I can see. May one 
> > > of his rigs can be modified I have not checked my self.
> > He does mention the use of Si570 programable xtal. I have one on a board
> > with set frequencies from a PIC and selected by binary from a dil switch.
> > They will not operate as low as 500kc/s so they have to be divided with
> > either a CD4040 or CD4060 or any other logic divider. However it gives
> > stable selectable xtal frequencies. In this case it is probably worth 
> > going
> > the extra mile and make up a DSS as the master oscillator which will give
> > VFO coverage. I think your pays your money and takes you choice as they
> > say....... hee.
> >
> > What i intend to do, is building a relatively simple Stand-Alone WSPR 
> > beacon
> > for 630m-Band. Using a Si570 with additional divider seemed to be quite 
> > an
> > expensive solution. So i did order 7611.2 KHz crystal ( there is a 
> > company
> > manucturing crystals according to given frequency ). By using a HCF4060B
> > oscillator/divider this should give a stable signal around WSPR midden
> > frequency 475.7 KHz. WSPR signal generation is planned according to
> > http://www.knology.net/~gmarcus/WSPR/WWVB_WSPR%20VCXO%20Contoller.pdf 
> > where
> > ( for use in Europe ) i intend to use DCF77 time signals instead of WWVB.
> > Suitable PIC program version is made by PE1NWL and available via
> > http://www.knology.net/~gmarcus/ , while DCF77 receiver module is 
> > obtainable
> > from Conrad Electronics.
> > Because of later signal division by 16, this conception will require a
> > multiplication of crystal FSK deviation by same factor. For WSPR this 
> > should
> > result in values around 23.43 Hz which ( i hope ) will not cause any
> > problem.
> > So far my plans in the moment, but of course it would be much easier, in
> > case somebody would offer a kit already doing all i like.
> > ..
> > Klaus, DJ7OO