Message-ID: <2ACEBB801F37473D99B5E5E58DF7C116@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> <2322587AEF8F416AA2B128FE6951D1EC@PcMinto> <11F3B6DF909A4F5D87F375ECE2E35EF8@AGB>
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Date: Tue, 8 Jan 2013 22:51:58 +0100
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Subject: LF: Re: 475kHz crystal
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Ah now I see where the confusion comes from.
The page you’re referring to contains an on-line calculator for the DDS 
(Device Configuration Assistant). Here you can – for instance – calculate 
the frequency and phase control words to get the DDS to output the desired 
frequency.  The calculator also displays the actual frequency, spurious 
ouputs etc.
It is _not_  an application to ‘program’ the DDS itself. You still need to 
connect the DDS to the PC, either using 8 bits parallel or 3 bits serial 
(both are supported by the DDS) and then transmit the calculated control 
words to the DDS.
You CAN use the parallel port + an applicable program like the one in the 
link I sent earlier. I’d go for the PIC version.  Take a good look at Andy’s 
solution. It won’t get easier than this.

Regards, Minto




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Ceterum censeo Carthaginem delendam esse
-----Original Message----- 
From: Graham
Sent: Tuesday, January 08, 2013 22:31
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: 475kHz crystal

Ok Minto

This  implies  it  can  address the  via the  serial  link , if so  , then
its a  way in ?

73 -G,


http://designtools.analog.com/dt/dds/ad9850.html

--------------------------------------------------
From: "Minto Witteveen" <minto.witteveen@gmail.com>
Sent: Tuesday, January 08, 2013 9:23 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: LF: Re: 475kHz crystal

> 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
>
>
>
>
> --------------------------------------------------------------------------
> 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
>>>
>>>
>>>
>>>
>>>
>>
>
>