Jerry, What you have described is similar to the 40m spectrometer I've built almost 2 years ago.
http://201.91.65.226/qrpbr/ 73, -- Edson, pu1jte, n1vtn Jerry Flanders wrote: >At 20:32 11/4/2006, somebody wrote: >... > > >>>I see this as a major tool. >>> >>> >>It would be. Sort of like an inverse DX Beacon system. >> >>There are some issues one would need to resolve to make it really useful: >>Control interface (doesn't need to be too fancy.. frequency and >>attenuation is about it) >> >> > >No - no interface. The thing simply makes available the last minute's >I/Q file. You have to know where it listens, of course, but it never >moves, and can be used at any time by any person knowing how, and the >know-how is easy to distribute. > > > > >> The interface needs to have some sort of scheme to allow a person >>to get control for some reasonable time, but also to avoid >>hogging. A lot of the "web controllable" cameras have some sort of >>mechanism for this. >> >> > >No - nothing like that at all. Anybody and everybody can download the >file within that hour - no hogging - no control. > > > > >>Calibration (either the oscillator has to be stable or externally >>derived, OR, you need good markers that are inband to compare >>to). Both the LO frequency and the sample rate need to be calibrated. >> >> > >I believe an ordinary RX of crystal-controlled softrock quality will >do the job. calibrate it if you wish. I had no calibration data with >N9VV's "RTTY contest" file, but found it extemely useful. > >Lastly, I think this could be a booster for PowerSDR / SDR in general >when the "public" learns how to use it and sees how neat SDR is. > >Jerry W4UK > > > > > >>><SNIP> >>>At 19:38 11/4/2006, Jim Lux wrote: >>> >>> >>>>At 10:53 AM 11/4/2006, Jerry Flanders wrote: >>>> >>>> >>>>>Looks like audio only - Unless I am missing something on this site, >>>>>this is not at all what I am talking about. >>>>> >>>>>Anybody else see the utility of having a distantly recorded I/Q file >>>>>of your own sigs to evaluate your TX quality? >>>>> >>>>> >>>>There are a few PCR1000's around the world that are web >>>>accessible. You can set it for wide band, tune it off your signal, >>>>and record the audio stream on *your* computer and then post process >>>>with any of a bunch of programs. I like DL4YHF's program, but any >>>> >>>> >>>should work. >>> >>> >>>>I suspect the online SoftRock40 would also work. >>>> >>>>We looked into doing something like this at JPLARC, in connection >>>>with doing the FMT, but we couldn't figure out a "good" way to do >>>>the spectrograms on the server and then serve them. Since we have a >>>>hydrogen maser distributed around the lab, we figured we could also >>>>put a really, really accurate marker into the receiver as well, so >>>>you could do "transmitted frequency accuracy" testing. >>>> >>>> >>>> >>>> >>>>>At 16:19 11/4/2006, Ken - N9VV wrote: >>>>> >>>>> >>>>>>Here you go: SoftRock40 online >>>>>> http://pa3ang.nl/index.php?php=sdr >>>>>>de ken n9vv >>>>>> >>>>>> >>>>>>Jerry Flanders wrote: >>>>>> >>>>>> >>>>>>>At 14:23 11/4/2006, you wrote: >>>>>>> >>>>>>> >>>>>>>>At 03:15 PM 11/3/2006, Gerald Youngblood wrote: >>>>>>>> >>>>>>>> >>>>>>>It could be a simple Softrock40 if a 48 KHz freq slice could be >>>>>>>found that allows all modes. >>>>>>>Jerry W4UK >>>>>>> >>>>>>> >>>>>_______________________________________________ >>>>>FlexRadio mailing list >>>>>FlexRadio@flex-radio.biz >>>>>http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >>>>>Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>>>>FlexRadio Homepage: http://www.flex-radio.com >>>>> >>>>> >>>>James Lux, P.E. >>>>Spacecraft Radio Frequency Subsystems Group >>>>Flight Communications Systems Section >>>>Jet Propulsion Laboratory, Mail Stop 161-213 >>>>4800 Oak Grove Drive >>>>Pasadena CA 91109 >>>>tel: (818)354-2075 >>>>fax: (818)393-6875 >>>> >>>> >>>_______________________________________________ >>>FlexRadio mailing list >>>FlexRadio@flex-radio.biz >>>http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >>>Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>>FlexRadio Homepage: http://www.flex-radio.com >>> >>> >>James Lux, P.E. >>Spacecraft Radio Frequency Subsystems Group >>Flight Communications Systems Section >>Jet Propulsion Laboratory, Mail Stop 161-213 >>4800 Oak Grove Drive >>Pasadena CA 91109 >>tel: (818)354-2075 >>fax: (818)393-6875 >> >> > > >_______________________________________________ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com > > > _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
