Depends on your soil. New England is mainly rock with very poor conductivity.
-John ============== > Hi > > Same gotcha as the horizontal dipole - most of the energy is shorted out > by the ground. Think of a transformer with a shorted turn. > > Bob > > > On Oct 5, 2010, at 5:58 PM, J. Forster wrote: > >> A loop around the house? >> >> -John >> >> ============== >> >> >>> Hi >>> >>> Ok, the next layer to this onion is the antenna. At 100KC your antenna >>> is >>> 35X smaller than it is on 80 meters foot for foot. In other words, your >>> 100' tall vertical on 80 equates to a <3 foot tall antenna at 100 KC. >>> QRP >>> on 80 with a 3' transmit antenna anybody? Been there done that, not >>> much >>> range at all. At VLF forget about transmitting with a horizontal >>> antenna >>> unless you are airborne. >>> >>> It's not just the antenna, the ground counts as well. If you are by the >>> seashore that may not be a big deal. If you are inland, prepare to lay >>> many very long radials. >>> >>> ---------- >>> >>> After that you hit signal to noise. The receivers worked as well as >>> they >>> did because they had an enormous signal to work with. There's an >>> amazing >>> amount of crud running around down below 200 KHz these days. Even for >>> timing you need a lot of signal to get good results. >>> >>> Bob >>> KB8TQ >>> >>> Ham for way more than 30 years.... >>> >>> >>> On Oct 5, 2010, at 4:59 PM, paul swed wrote: >>> >>>> Well crazy as it sounds if you are at 100 KC you might just want 1 >>>> loran >>>> tower in a chain or even fewer. You only need 1 station not 3. Timing >>>> rcvrs >>>> worked on one signal. >>>> >>>> >>>> On Tue, Oct 5, 2010 at 4:46 PM, <shali...@gmail.com> wrote: >>>> >>>>> Not necessarily, on 3 phase systems, you would have to be creative to >>>>> get >>>>> below .9 >>>>> >>>>> You can easily get to .95 with a simple multipulse rectification. >>>>> Beyond >>>>> that, other than regulatory compliance, you do not gain much >>>>> efficiency. >>>>> >>>>> I can't imagine these systems running on anything other than 3 phase >>>>> power. >>>>> >>>>> Didier >>>>> >>>>> Sent from my Verizon Wireless BlackBerry >>>>> >>>>> -----Original Message----- >>>>> From: "J. Forster" <j...@quik.com> >>>>> Sender: time-nuts-boun...@febo.com >>>>> Date: Tue, 5 Oct 2010 13:37:21 >>>>> To: Discussion of precise time and frequency measurement< >>>>> time-nuts@febo.com> >>>>> Reply-To: j...@quik.com, Discussion of precise time and frequency >>>>> measurement >>>>> <time-nuts@febo.com> >>>>> Subject: Re: [time-nuts] 60 KHz Receiver >>>>> >>>>> And the Power Factor sucks, so there is a lot less real power being >>>>> used. >>>>> >>>>> -John >>>>> >>>>> ============= >>>>> >>>>>> Ok, but that is no megawatt! >>>>>> >>>>>> Also, most of the transmitters were doing multi duty, handling >>>>>> several chains simultaneously. That would up the average power >>>>>> proportionately. >>>>>> >>>>>> -Chuck Harris >>>>>> >>>>>> Poul-Henning Kamp wrote: >>>>>>> In message<4cab888b.4040...@erols.com>, Chuck Harris writes: >>>>>>>> It is a pulse transmitter. It makes short bursts of 10 or 12 >>>>>>>> pulses, >>>>>>>> and then waits one GRI, and then does it again. I would think the >>>>>>>> actual continuous power draw is around 10Kw. >>>>>>> >>>>>>> http://phk.freebsd.dk/photos/L9007M/dscf0458.jpg.html >>>>>>> >>>>>>> About 50kW for Ei�i (400kW, 9007M) >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> 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. >>>> >>> >>> >>> _______________________________________________ >>> 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.