I have listed where I have got it and where anybody can get it from, read it and understand what SDR is.
Why do you think it is restrictive? SDR is an evolution of the traditional concept of a radio. Therefore we have to make some distinctions to come to a more detailed understanding of what it is. For a long time we had analogic radio circuitry only. Then some parts have been digitalised as e.g. the VFO with the advent of PLL and its programmable divider stages, the electrooptical tuning knob etc.. Note, having something digital in a electronic circuit doesn't mean to have software running! Next it has been introduced the microcontroller to control display circuitry, to electronically switch of various functions (already made of analogic circuits) as mode, PTT, tune and some sort of telecontrol through an interface port (often a RS-232). At this stage of the radio evolution, SDR is not involved, yet, due to the fact there is still no software signal processing but (tele)control of the radio's hardware parts only. The successive step relates to the first DSP applications on processing to filter the audio signals coming from the BF stages of a RTX. This can be considered the first phase of Software Defined Radio because *software processes*, and not simply digital circuits technology!, substitutes a part of the radio circuit. The further step, and second SDR implementation phase, has been made by the introduction of DSP into the IF stages due to availability of more powerful DSP cores. I'll underline that remote as local control of circuits has nothing to do with SDR either if it is performed by a PC or by local processors in the RXT box! SDR is the technology of elaborating the to be received signals through software running on one or more microprocessing units (it is unimportant if it resides on the PC or on a DSP in the radio box). As I've stated in my precedent e-mails FPGAs are reconfigurable hardware circuits, not software processing units! For this reason FPGA cannot be considered part of an SDR. They are *hardware substituting some other hardware* and convenient in a context of a reconfigurable hardware radio. The fact they are reconfigured (reprogrammed) using some software on a PC doesn't mean that FPGAs process radio related signals by running software. In other words, local or remote radio control is not SDR. SDR is treating, converting, modifying a received signal by the use of a software program instead of traditional electronic circuitry, nothing else. If this concepts, in your opinion, aren't still addressing the points then I apology for this and invite you to take a view to the rich documentation I have mentioned before. vy 73s de Andreas Troschka - ik2wqi [EMAIL PROTECTED] wrote: > You missed my point, where did you get your definition of a SDR radio, > it seems awfully restrictive. > > A PC, A DSP, and a FPGA are all controlled by "Software" that defines > what they do, so they are all "Software Defined Radios" > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get to your groups with one click. Know instantly when new email arrives http://us.click.yahoo.com/.7bhrC/MGxNAA/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/
