Re: LF: ik2pii pll for 136kHz?

[G0MRF@aol.com]

Hello Dick.

 

If it's simplicity: performance, then it's hard to beat Johan's DDS using the AD9832.

 

I once did a PCB for that which included all sorts of filtering and PSK modulation. But if you leave off all that optional stuff it really comes down to 4 components.

 

1) A PIC controller

2) The DDS

3) A buffer amp

4) An LCD display.

 

No boards left now but it can be built on small pitch veroboard.

 

Johan's link is   http://home4.swipnet.se/~w-41522/minidds/minidds.html

 

While the picture of my version is at:  http://www.g0mrf.freeserve.co.uk/dds.htm

 

Note that in the final version of my PCB apx 60% of the board area / components are not required for simple applications.

 

Good to see you getting results with the TX

 

Regards

 

David

 

 

 

 

 

In a message dated 16/08/2006 06:21:27 GMT Standard Time, knaap159@zonnet.nl writes:

I thouht to have seen a PLL design by IK2PII or an other I-station for 136kHz which uses rather simple components.

Unfortunatly I lost the schematic, and can't find it back on internet either.

Anyone?

 

I've found a design from OK1DX, but I have troubles to print the schematic diagram, it will not fit on one page......

 

73

 

Dick, pa4vhf