KA7V Amateur Radio

My Biographical Information - This is a Science and Technology Blog General Table of Contents KA7V HF Station KA7V 70cm EME Station Parameters

[ka7v]

Sun Emissions 432 MHz.

Red marker is Cold Sky North.

In this test, the preamp has a NF of 0.43 db. No cascade. It will be interesting to see the same measurements with preamp with NF of 0.38 db and additional gain from second preamp.

[ka7v]

The Kirkland Image - Space Shuttle Columbia.

[ka7v]

Visit Original Link

My recording of a echo of my 432 MHz radio signal off Earth's moon. It travels at the speed of light and takes about 2.5 seconds for the round trip.

The echo isn't very loud. When an audio file is converted from a wav format to and mp3 format, the signal is degraded. And I can't upload a wav file to tumblr. If you listen carefully though it is in there.

See:

KA7V 70cm EME Station Parameters.

[ka7v]

Calculus Made EASY! Finally Understand It in Minutes!

Think calculus is only for geniuses? Think again! In this video, I’ll break down calculus at a basic level so anyone can understand it — even if you’ve never seen it before! Whether you’re a high school student, college student, or just curious, this is the simplest explanation you’ll ever hear!

TabletClass Math

[ka7v]

3I/ATLAS First Mars Flyby Images Hint at Something Odd!

3I/ATLAS at Mars: Perseverance’s Oct 2–3 sky frames appear to catch a 60 km/s streak during the flyby. We examine the big claims—multiple objects, a brief green flash—and the quiet period from Mars orbiters. Nature vs Tech: chemistry, tail geometry, mass/acceleration, and the tell-tale 1420 MHz radio test. What to watch after perihelion: reappearance brightness, trajectory shifts, and any confirmed fragments.

Cosmic Atlas

[ka7v]

What NASA Found on Pluto.

Pluto isn’t what we thought it was, it’s much more.

The Space Race

[ka7v]

FT8 is Poison to Radio Frequency Communication.

[ka7v]

The Insane Engineering of the X-15.

Real Engineering

[ka7v]

Ham radio infestation-worldwide gathering of social misfits.

The truth about amateur radio and how useless most of the grant of frequencies is.

burt2481

[ka7v]

Parker Solar Probe: Humanity’s Closest Encounter with the Sun.

Controllers have confirmed NASA’s mission to “touch” the Sun survived its record-breaking closest approach to the solar surface on Dec. 24, 2024. Breaking its previous record by flying just 3.8 million miles above the surface of the Sun, NASA’s Parker Solar Probe hurtled through the solar atmosphere at a blazing 430,000 miles per hour — faster than any human-made object has ever moved. A beacon tone received in the late evening hours of Dec. 26 confirmed the spacecraft had made it through the encounter safely and is operating normally. This pass, the first of more to come at this distance, allows the spacecraft to conduct unrivaled scientific measurements with the potential to change our understanding of the Sun.

NASA Goddard

[ka7v]

Visit Original Link

This is a recording of my signal (Call Sign KA7V) reflected from the moon and received by SM2CEW located in Sweden.

It is Morse Code and consists of my call sign (KA7V) and SM2CEW''s Call Sign. SM2CEW recorded my signal sending RO and OOO which means received entire message and a completed contact or QSO. Distance Round Trip is about 478,000 miles/770,000 km. Time round trip is about 2.5 seconds at the speed of light.

My Equpment:

Yaesu FT991A transceiver, Kuhne 432 A high-electron-mobility transistor Preamp, Lunar Link LA70B Amplifier 1.5 KW output, 4 Cushcraft 719B Yagies, Computer Program for antennas tracking the moon. Peter's equipment was similar. He made this recording from his radio's speaker using a cell phone for recording mp4 format files.

[ka7v]

Signals from Deep Space: What ‘Fast Radio Bursts’ Sound Like.

In 2007, a professor and his student were analyzing neutron star data when they noticed something odd....a 5 millisecond radio signal stretched across a wide range of frequencies, suggesting interstellar plasma had dispersed it on its way to Earth. The dispersion was so high that it must’ve originated outside the Milky Way, passing through clouds of gas over billions of light years. This became known as a Fast Radio Burst — now we’ve found close to 40. We have radio data from one FRB (121102) and it's translated into sound waves perceptible to the human ear. Scientists still don't know what causes these, but they have some ideas.

It's Bloody Science!

[ka7v]

QTH of SM2CEW in Sweden Easter 2024

High latitude weather in 2024.

[ka7v]

Isaac Newton's Laws of Motion

Newton enunciated 3 laws of motion:

Every body continues in its state of rest or uniform motion unless acted on by a force.

The time rate of change of momentum of a body is proportional to the applied force (both considered as vector quantities).

To every action there is an equal and opposite reaction.

Conservation of momentum and angular momentum

Newton’s laws give us two important conservation laws:

Conservation of linear momentum; in the absence of any force, the linear momentum of a body does not change. 

Conservation of angular momentum; in the absence of any torque, the angular momentum of a body does not change.

Inertial Frame

Newton’s laws applied in a coordinate system or inertial frame.

Newton stated that this frame coincided with the fixed position of stars.

Any reference frame moving uniformly (that is, without acceleration) with respect to the fixed stars is also inertial, as implied by Newton’s first law.

Inertial Force

Newton’s laws only are true in inertial frames.  If Newton’s laws are applied to motion within a non-inertial frame, it is necessary to introduce fictitious forces to compensate for the effects of the acceleration of the frame.  These are called inertial forces. 

Centrifugal force, Coriolis force

Examples of inertial forces:

The centrifugal force is the apparent outward force experienced by a body at rest in a rotation frame, as for example, experienced by a passenger in a car turning a sharp corner.

A Coriolis force is an additional force experienced by a body moving in a rotation frame. It is commonly encountered in fairgrounds, on some types of apparatus that turn in more than one direction at once.

Energy, Potential Energy, Kinetic Energy

Energy is the capacity of a body or system for doing work. It formally related to the effect of a force acting on a body for a specific distance.  Potential energy is the energy a body posses by virtue of its position or state.  An example is a rock perched on top of a cliff, which required a force to have pushed it up the hill; the energy can potentially be recovered by pushing off the cliff. Kinetic energy of a body possesses by virtue of its motion. An example is a fast moving rock just before it hits the ground after falling off a cliff, and which was accelerated by the force of gravity in its downward plunge.

Potential Well

A potential well is a position or state of a body where it has less potential energy than it would have in any neighboring position or state.

Gravity, Newton’s law of gravity and the Gravitational Constant

Gravity is the force experienced by a body as a result of the positive attraction between masses.  Newton’s law of gravity states that the gravitational force produced by one body acting on another body is in the direction of the body and proportional to the product of the masses divided by the square of the distance between them.  The two bodies thus exert an equal and opposite effect on each other.  The constant of proportionality, G, is called the gravitational constant. Some math required.

See Gravity and General Relativity and Gravity

Essential source: Cambridge Encyclopedia of Astronomy.

[ka7v]

What Physics Teachers Get Wrong About Tides! | Space Time | PBS Digital Studios.

We all know tides have something to do with gravity from the Moon and Sun, but if gravity affects the motion of all objects equally, then how come oceans have large tides while other bodies of water don't? It's because your mental picture of the tides is probably WRONG!!! Join Gabe on this week’s episode of PBS Space Time as he sets the record straight on tidal force, gravitational differential and what role the moon actually plays in tides. Why don't lakes have tides? Watch the episode to find out!

PBS Space Time

[ka7v]

Construction of US Navy’s aircraft carrier John F. Kennedy hits important milestone by Fatima Bahtić

The construction of the US Navy’s aircraft carrier John F. Kennedy has reached a significant milestone, American shipbuilding company Huntington Ingalls Industries revealed.

As informed, the company achieved a milestone in the compartment and systems construction of aircraft carrier John F. Kennedy (CVN 79).

Newport News recently turned over to the ship’s crew the 1,000th compartment of the 2,615 total spaces. The milestone reflects the shipyard’s steady progress toward delivery of the ship to the navy, according to the statement.

Newport News has also installed more than 9.8 million feet of cable, or more than 1,800 miles, of the approximately 10.5 million feet of cable on the vessel.

The completed spaces include electrical and engineering. This will allow sailors assigned to the pre-commissioning unit to increase training on the ship while final outfitting and testing process.

John F. Kennedy, the second in the Ford class, was launched in late October 2019 and is the second aircraft carrier of the Gerald R. Ford class, slated to replace USS Nimitz (CVN 68) when that ship is decommissioned.

The ship was christened in December 2019 and is scheduled to be delivered to the US Navy in 2024. Two other Ford-class aircraft carriers are currently under construction at Newport News, Enterprise (CVN 80) and Doris Miller (CVN 81).

The Ford-class aircraft carriers are the first to be designed 100% digitally.

John F. Kennedy represents a transition to a new digital construction process, with shipbuilders beginning to use visual work instructions on laptops and tablets rather than paper drawings. 

The ship is being built in sections with more outfitted equipment—valves, pipe, electrical panels, mounting studs, lighting, ventilation and other components—than any other aircraft carrier built at Newport News.

The use of new technologies, including digital work instructions that provide shipbuilders digital 3-D data versus traditional paper drawings, has increased efficiency and productivity, the shipbuilder said.

Enterprise will be the first carrier totally built using digital tools.

Ford-class ship enhancements incorporated into the design include flight deck changes, improved weapons handling systems and a redesigned island, all resulting in increased aircraft sortie-generation rates.

The aircraft carriers also feature new nuclear power plants, increased electrical power-generation capacity, allowance for future technologies, and reduced workload for sailors, translating to smaller crew size and reduced operating costs for the US Navy.

Construction processes on Ford-class carriers are enabled by workforce learning that took place on USS Gerald R. Ford (CVN 78) and those lessons are being applied throughout the Ford class.

[ka7v]

Truth revealed about ham radio.

K1OIK speaks the truth about ham radio. Contesters, "a proud and meaningless association of human beings".

burt2481