Message-ID: <2322587AEF8F416AA2B128FE6951D1EC@PcMinto>
From: Minto Witteveen <minto.witteveen@gmail.com>
To: <rsgb_lf_group@blacksheep.org>
References: <CAKvcm2eHxEZXc4=wKP0nnZyvoedaReSHrRGmZB2pUOC_RJ1grw@mail.gmail.com> <1357561166.96226.YahooMailNeo@web133202.mail.ir2.yahoo.com> <1357566320.97293.YahooMailNeo@web133202.mail.ir2.yahoo.com> <1357567457.74036.YahooMailNeo@web133201.mail.ir2.yahoo.com> <CAKvcm2e=6D+3kfUgro7nWYSF2onDXJ0SxP=kJh38kR+N0hEBxg@mail.gmail.com> <1357606435.22427.YahooMailNeo@web133202.mail.ir2.yahoo.com> <E549801DCF6544F2AFAD64D6BCB2EFAC@KlausPC> <1357639491.23767.YahooMailNeo@web133206.mail.ir2.yahoo.com> <90680D974ED44B74BA3A69AD3D1D74B5@KlausPC> <7DF58DAAC3444D83B9955324AACF6132@PcMinto> <5FB5E7A5A752436C942BD62A4A66E239@AGB> <5DB499C4565845A1898DE96BD73FDB73@PcMinto> <533F9BD29DAB45C49C86D2F1BFF53425@AGB>
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Date: Tue, 8 Jan 2013 22:23:11 +0100
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Subject: LF: Re: 475kHz crystal
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Graham,
Did you find a website of the mfg of this specific board? I can’t find it, 
although there is plenty of info on the Internet for this specific board 
(pin layout, programming specs). And of course 9850 datasheets on the 
website of Analog Devices, the mfg of the DDS chip itself.
Can you point me to the website with the pc based support software, I will 
look into it to see what it can do. But whatever the software can do, you 
still need to interface the SPI, and a ‘standard’  PC has only the parallel 
interface that can be used..

Minto pa3bca




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Ceterum censeo Carthaginem delendam esse
-----Original Message----- 
From: Graham
Sent: Tuesday, January 08, 2013 22:06
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: 475kHz crystal

>From the  mfg  web-site , seems  to  be  pc based  support  software ?
could  not  this be  used to  run the  'dds  demonstration kit'   directly
?

--------------------------------------------------
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
>>
>>
>>
>>
>>
>