Re: Fw: LF: 475kHz crystal

["Klaus Hirschelmann" <k.hirschelmann@kabelmail.de>]

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