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, <[email protected]> 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" <[email protected]> >>> Sender: [email protected] >>> Date: Tue, 5 Oct 2010 13:37:21 >>> To: Discussion of precise time and frequency measurement< >>> [email protected]> >>> Reply-To: [email protected], Discussion of precise time and frequency >>> measurement >>> <[email protected]> >>> 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<[email protected]>, 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 -- [email protected] >>>>> To unsubscribe, go to >>>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- [email protected] >>>> To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>> >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> _______________________________________________ >>> time-nuts mailing list -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
