WOW I would have loved to have seen that once that power was produced how did they keep it on frequency,,, or was it just there but timed in sync wth everyone else,, I can see how it was turened on / off in time but not to keep on freqency,,,,
wild Bob On Wed, 07 Dec 2011 15:43:23 -0800 Fred Jensen <k6...@foothill.net> writes: > On 12/7/2011 1:20 PM, Merv Schweigert wrote: > > > I am sure that spark gap days are back, but no one mentioned the > > gap was between the ears. > > Well, actually yes. I have a couple of Coast Guard friends from > Vietnam, and awhile back, one of them pointed me to a LORAN-C > upgrade at > some of the stations. The previous equipment was sort of standard > OSC->PA architecture using BIG tubes. Many ran in the half-MW > range, > the station at George WA was originally 1.6 MW. After the "upgrade" > it > was running 1.2 MW. > > The upgrade replaced the TX with an Accufix TX from Megapulse. No > tubes, no oscillators, no solid state amplifiers. A bank of SCR's > discharged a large capacitor bank into a resonant circuit coupled to > the > antenna. [sound familiar?] Other than a large adjoining room > filled > with very high-tech control equipment, cesium clocks, and bunches of > > software, it was basically a 1.2 megawatt, well controlled spark > gap. > After the properly shaped pulse was formed, the rest of the damped > wave > was eliminated by a circuit aptly named The Tail Biter. Since the > antenna was part of the resonant circuit, the control circuitry > included > an auto tuner that compensated for real-time antenna variations. > > LORAN-C was shut down a couple of years ago, but some of the > antennas > remain [mainly top-loaded monopoles]. I wonder if a KAT500 would be > > able to load one on 160m? > > 73, > > Fred K6DGW > - Northern California Contest Club > - CU in the 2012 Cal QSO Party 6-7 Oct 2012 > - www.cqp.org > > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > > ____________________________________________________________ 53 Year Old Mom Looks 33 The Stunning Results of Her Wrinkle Trick Has Botox Doctors Worried http://thirdpartyoffers.juno.com/TGL3141/4ee00459379559af76m03vuc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
