----- Original Message ----- From: "Alberto I2PHD" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, October 10, 2005 6:37 PM Subject: Re: [soft_radio] Re: SDRadio - what's next ?
> F6EHJ wrote: > >> Including all the hardware control (including DDS LO) imposes the LO (and >> the DDS) and the associated circuits I suppose, which reduce dramatically >> the opportunity to have its own hardware and exact duplication will be >> the >> only way to succeed. > > I think that the proposal of Tom Holden is a very sensible one, and I > probably will write the > hardware-controlling part of the program in two sections. The first will > call an external DLL > using a published interface, not tied to the specific hardware used. The > DLL itself will then > translate the requests into the specific commands needed for the hardware > on hand. > In this way everybody who would like to use a different hardware could > rewrite just the DLL > for his specific needs. > That sounds great. Leaving some flexibility will not stuck to a single hardware design. >> Considering the transmit section a simple12 kHz I/Q output would be fine >> and enough. It could be generated with a secondary sound card to avoid >> sophisticated switching, in this case a single RX/TX command will be >> needed. > > I don't know which sophisticated switching you are referring to, but if > you mean an output > sampling speed during Tx time different from that used during Rx time, > switching the sampling > speed of a sound card is quite easy, so a separate card in the PC is not > needed. I was thinking about the SDR1000 which now use a full duplex audio card. > If instead you mean switching the line-out of the card from the speakers > (while receiving), > to the I/Q up-mixer (while transmitting), then a simple relay will do, > driven by the PTT > signal, which the program could activate by using just a pin of the > parallel port. That's fine. > > BTW, I have reports that say that some of my programs work correctly with > external USB sound > cards, so this could be a solution for those who have obsolete chip sets > in their laptops > (e.g. not capable of 96 kHz sampling). Thanks a lot Alberto. I will follow the future development. Best 73 Gérard/F6EHJ > > 73 Alberto I2PHD > > > > > > > Yahoo! Groups Links > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page http://us.click.yahoo.com/dpRU5A/wUILAA/yQLSAA/ELTolB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
