now THAT would be interesting, single op, multi-multi ?? 73, w5xz, dan --- On Tue, 5/15/12, Jim Fuller (N7VR) <n...@fuller.net> wrote:
From: Jim Fuller (N7VR) <n...@fuller.net> Subject: Re: [Flexradio] Imagine digital starting at the antenna connector... To: "'Brian Lloyd'" <brian-wb6...@lloyd.com> Cc: "'FlexRadio List'" <flexradio@flex-radio.biz> Date: Tuesday, May 15, 2012, 3:15 PM Yes Brian, But if I am going to have that then I WANT it all. Direct D:A at 1500 watts to the antenna with go spectral purity and ability to transmit on multiple frequencies at the same time. Since the receiver lets me hear and decode multiple frequencies at the same time, why not have multiple transmit :-) Of course this does mean new software that couples directly to the operator, so thoughts can be used to handle the multiple streams at once. The ears, eyes, voice, and fingers, are just too slow as interfaces to handle that much information simultaneously. But then I said I WANT it all ;-) Jim Fuller N7VR -- http://www.n7vr.org International TCP/IP Gateways Robot Operator -- http://www.ampr-gateways.org MTAPRS NET Server Operator -- http://www.mtaprs.net CWOP-2 -- http://www.wxqa.com IRLP Node 3398 - http://irlp.fuller.net Original ARECC contributor -----Original Message----- From: flexradio-boun...@flex-radio.biz [mailto:flexradio-boun...@flex-radio.biz] On Behalf Of Brian Lloyd Sent: Tuesday, May 15, 2012 8:46 AM To: Drax Felton Cc: FlexRadio List Subject: Re: [Flexradio] Imagine digital starting at the antenna connector... On Tue, May 15, 2012 at 7:07 AM, Drax Felton <draxfel...@gmail.com> wrote: > So how does a lack of base band conversion improve upon what the flex > 5000 already does? > Drax, you need to understand how a direct sampling receiver works. In essence, it uses an analog-to-digital converter connected directly to the antenna. (In reality there is buffering, matching, and filtering to keep unwanted signals out of the A:D but the basic concept is the same.) The other part of the secret is called decimation, which allows you to trade bandwidth for dynamic range. So the receiver can go from being a wide-band, see-everything-from-1.8MHz-to-54MHz, radio, to a narrow-band radio with world-class dynamic-range and IP3 numbers at the flip of a software "switch". (BTW, it does still need a good front-end filter.) So, yes, a direct-sampling radio would be a game-changer (in my not-so-humble opinion). -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 br...@lloyd.com +1.767.617.1365 (Dominica) +1.916.877.5067 (USA) _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2176 / Virus Database: 2425/5000 - Release Date: 05/15/12 _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/ _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flexradio.com/ Homepage: http://www.flexradio.com/
