[Elecraft] Markers, etc.
riese-k3djc at juno.com
riese-k3djc at juno.com
Wed Dec 7 19:25:59 EST 2011
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 <k6dgw at 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
>
>
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