Re: [time-nuts] Modulation Domain Analysis
Bob, I'm the Tektronix Application Engineer who posted about this topic about a month ago. Sorry for the delay in responding to your question about the B channel divider feature. Since the TVC501 measures period, it will have a very low resolution when measuring higher frequencies (such as 10 MHz). Using the divide by 1000 feature produces a proportionally greater resolution. The offset feature allows the high count to be translated down to the D/A converter range, so that moderately small changes in that frequency are converted into voltage changes. The TVC501 was introduced when analog (and early digital) oscilloscopes didn't have time qualified triggering. One key use for this instrument was to provide an analog trigger signal for such oscilloscopes based on period or time internal. Another use was to allow the user to use an oscilloscope to measure the settling time behavior of PLL's up to the divider maximum input frequency. My office is moving over the next month or so to a new location. Since the TVC501 was introduced before PDF and other user document formats were available, I'm pretty sure I don't have some old floppy disk with support documents. I would have to get assistance from others to read a floppy disk these days anyway! There is a small possibility that I have some old printed TVC501 application information which didn't get discarded during my last office move, and I will look for any such material during our move. -- Bill Byrom N5BB On Sat, Jun 27, 2015, at 12:24 AM, Robert Gilchrist Huenemann wrote: I have received the manual for the TVC-501 plug in. What I really am looking for is application notes for this plug in. So far no luck. My main question is about the divide by 100 and 1000 functions of the B channel input. Can anyone tell me what kind of applications would have used those divide functions? Thanks Robert Gilchrist Huenemann, M.S.E.E. 120 Harbern Way Hollister, CA 95023-9708 831-635-0786 bo...@razzolink.com https://sites.google.com/site/bobhuenemann/ Extra Class Amateur Radio License W6RFW IEEE Life Member 01189471 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus _ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Any other useful purpose for Austron 2100F or SRS FS700 receivers in US
Magnus I use a 420 ohm resistor to make FS700 happy. I have a LORAN C whip antenna and preamp that then feeds a distribution amplifier for the 4 Loran C rcvrs. The loran C simulator lives in the same box and can feed the rcvrs also. Regards Paul WB8TSL On Sun, Jul 12, 2015 at 11:10 AM, Magnus Danielson mag...@rubidium.dyndns.org wrote: Hi, For the USA and Canada, currently LORAN-C is history. However, LORAN-C signals is still relatively well know and eLoran is a backward compatible change for which there already is a market, so that is good. I think I recall another digital signal being discussed as a side-band, which I also think I saw some specs on in an article, and it looked interesting. We did discuss it on the list many moons ago, maybe someone recalls and can dig up the references. I have a FS700 for which I currently does not have a proper antenna. I coiled up some twisted pair, but it complains about no external LNA, so I will have to create something which acts as LNA and essentially forms the same DC load to the FS700. I have the SC-10 OCXO in mine, and as I recall, I think I saw GRI 8 from russia. It would be nice to run it for a while. Cheers, Magnus On 07/12/2015 01:45 PM, Bob Camp wrote: Hi So far, all of the eLoran stuff has been backwards compatible with Loran-C. If the signal turns into a “time signal only” in the future, that could change. Since the only signals that have been put on the air have been Loran-C compatible, any change is pure speculation at this point. Any signal change would have to either cause no harm to Loran-C navigation *or* go on the air after Loran-C navigation was history. Bob On Jul 11, 2015, at 8:15 PM, D W watsondani...@gmail.com wrote: I saw in an article that there is an eLoran site online in NJ. Is that true? And if so, is there any backwards compatibility for the old Loran-C units? Dan On Jul 11, 2015, at 8:14 AM, James Robbins jsrobb...@earthlink.net wrote: Does anyone know of any other genuinely useful purpose to which the Austron 2100F, SRS FS700, etc receivers can be put in the US since the demise of Loran? Inquiring minds would like to know. Jim Robbins, N1JR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] LORAN-C reception in the UK
It is given somewhat indirectly. Initially plans was for 200 km. The final system map had 100 km and 400 km marks. Read the linked PDF. Cheers, Magnus On 07/12/2015 12:48 AM, Björn wrote: Did you check the jamming radius? div Originalmeddelande /divdivFrån: Magnus Danielson mag...@rubidium.dyndns.org /divdivDatum:2015-07-11 18:00 (GMT+01:00) /divdivTill: time-nuts@febo.com /divdivKopia: mag...@rubidium.se /divdivRubrik: Re: [time-nuts] LORAN-C reception in the UK /divdiv /divHi, On 07/11/2015 03:18 PM, Poul-Henning Kamp wrote: In message CAPbEEQJxn+R5AvCenfyXjFU=WOjFbYxZd2EC_hX=c6muyev...@mail.gmail.com , ken hartman writes: the European Radio Navigation Plan having twice been drafted but never published. The view seems to bee that the introduction of Galileo will achieve resilient PNT, which it will not.” The reason the ERNP wasn't published, was that it concluded that 40% of *all* benefits came from Loran-C, at a yearly cost only a fraction of a single Galileo launch vehicle. Someone should have dreamed up the aggregate robustness of eLoran, GALILEO and EGNOS. LORAN-C and eLORAN would be an interesting combination to GPS and GALILEO. Sweden essentially had it's own set of LORAN/Chayka transmitters, with a ever evolving jamming/spoofing ability. RT-02 Fredriksson was the system name, often just referred to as Fredriksson. http://www.antus.org/RT02.html http://www.fht.nu/fv_bilder_radio_rasandare_rt_02.html http://www.fht.nu/Dokument/Flygvapnet/flyg_publ_rapport_rt_02.pdf So much for jamming-resistant. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Any other useful purpose for Austron 2100F or SRS FS700 receivers in US
Hi So far, all of the eLoran stuff has been backwards compatible with Loran-C. If the signal turns into a “time signal only” in the future, that could change. Since the only signals that have been put on the air have been Loran-C compatible, any change is pure speculation at this point. Any signal change would have to either cause no harm to Loran-C navigation *or* go on the air after Loran-C navigation was history. Bob On Jul 11, 2015, at 8:15 PM, D W watsondani...@gmail.com wrote: I saw in an article that there is an eLoran site online in NJ. Is that true? And if so, is there any backwards compatibility for the old Loran-C units? Dan On Jul 11, 2015, at 8:14 AM, James Robbins jsrobb...@earthlink.net wrote: Does anyone know of any other genuinely useful purpose to which the Austron 2100F, SRS FS700, etc receivers can be put in the US since the demise of Loran? Inquiring minds would like to know. Jim Robbins, N1JR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Any other useful purpose for Austron 2100F or SRS FS700 receivers in US
Hello Jim, Would you happen to have complete schematics for the Austron 2100F? 73's, John AJ6BC On Sat, Jul 11, 2015 at 2:38 PM, paul swed paulsw...@gmail.com wrote: They can be useful as a comparator between two references as long as you have a LORAN C simulator to drive the system. I built up a unit 3 years ago may still be in the time-nuts archives. It was fairly simple to accomplish. I took the reference and drove the simulator. Then the simulator feeds the FR700 or austrons 2100s,2100F, and 2000. All worked. Kind of a crazy thing to do but hated to see the systems die. Regards Paul WB8TSL On Sat, Jul 11, 2015 at 11:14 AM, James Robbins jsrobb...@earthlink.net wrote: Does anyone know of any other genuinely useful purpose to which the Austron 2100F, SRS FS700, etc receivers can be put in the US since the demise of Loran? Inquiring minds would like to know. Jim Robbins, N1JR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Any other useful purpose for Austron 2100F or SRS FS700 receivers in US
Hi, For the USA and Canada, currently LORAN-C is history. However, LORAN-C signals is still relatively well know and eLoran is a backward compatible change for which there already is a market, so that is good. I think I recall another digital signal being discussed as a side-band, which I also think I saw some specs on in an article, and it looked interesting. We did discuss it on the list many moons ago, maybe someone recalls and can dig up the references. I have a FS700 for which I currently does not have a proper antenna. I coiled up some twisted pair, but it complains about no external LNA, so I will have to create something which acts as LNA and essentially forms the same DC load to the FS700. I have the SC-10 OCXO in mine, and as I recall, I think I saw GRI 8 from russia. It would be nice to run it for a while. Cheers, Magnus On 07/12/2015 01:45 PM, Bob Camp wrote: Hi So far, all of the eLoran stuff has been backwards compatible with Loran-C. If the signal turns into a “time signal only” in the future, that could change. Since the only signals that have been put on the air have been Loran-C compatible, any change is pure speculation at this point. Any signal change would have to either cause no harm to Loran-C navigation *or* go on the air after Loran-C navigation was history. Bob On Jul 11, 2015, at 8:15 PM, D W watsondani...@gmail.com wrote: I saw in an article that there is an eLoran site online in NJ. Is that true? And if so, is there any backwards compatibility for the old Loran-C units? Dan On Jul 11, 2015, at 8:14 AM, James Robbins jsrobb...@earthlink.net wrote: Does anyone know of any other genuinely useful purpose to which the Austron 2100F, SRS FS700, etc receivers can be put in the US since the demise of Loran? Inquiring minds would like to know. Jim Robbins, N1JR ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
