Category: Electronics

Do Snake Repellers Work

blogger

The burning question most people have is. Do snake repellers work?
There are many people who will post that they don’t work, some say they do and youtube has a lot of posts about the pro’s and con’s. The thing I have noticed is that most of the derogatory comments seem to come from snake catchers.
So the only thing to do is to find out as much as possible about these things.

In house test.
The best thing to do is to try it. So when I found a snake in the front garden, I placed one of these electronic snake repellers in the middle of the garden which was about 6 metres across.

The snake was living in a rotted tree stump in the middle of the garden bed.

To make this as close to a test environment as possible, I observed the snakes movements over a 7 day period and would see it out sunbathing and hunting for food. It was a red bellied black snake.

On the afternoon of the 8th day I placed the Sentinel Solar snake repeller in the garden.
The next morning when I went to see the snake sunbathing in its usual spot there was no snake. I checked at the other times when I had seen the snake and sure enough, No Snake.

In this case there seems to be evidence that the snake has been repelled from the area and deterred from returning.
Interestingly, some 6 months later I saw a snake very similar to the other one in another part of the yard about 20 metres from where it was sighted last time. So far I haven’t been able to determine whether or not it’s living permanently in this area.

Other examples of people having success with snake repellers are, this one from the permaculture living forum

kolecta
19-12-2010, 09:19 PM
Hello readers, with much skepticism, three years ago we took a chance and brought 5 solar snake repellers for our 2 acres in central tasmania (we had nicked named it, snake central) three years on and to this day we still hasn’t seen another brown since, believe what you want i say they work and i never fear about sending the grandkids out the back to play anymore.

Science 101 Earth Curvature And Troposphere Propagation

blogger

The curvature of earth produces two effects firstly it reduces the difference in the path lengths between the direct and ground reflected waves by raising the point of reflection above that of a plane earth and as a result tends to reduce the strength of the received field, secondly curvature of the earth causes the reflection at the ground to take place from a spherical rather than a flat surface so that the reflected ray becomes divergent and consequently becomes weaker at the receiving point. This tends to increase the field strength of the total space wave at the receiving point. These two opposite effects produced by the earths curvature almost neutralize each other. As a consequence, the assumption of a plane earth yields results which remain valid in spite of considerable curvature of earth. The condition in the troposphere keeps on changing with time. Hence the amount of bending of refraction of waves also changes from time to time. This influences the relative path length of the direct and the ground reflected components of space wave. Hence the field strength of the resultant space wave at the receiving point changes, i.e. fading of the wave results. Small but abrupt discontinuities in the dielectric constant of air existing at the boundaries of air masses of widely different characteristics result in mirror like reflections. Such reflections may cause signal to be received at the points beyond the line of straight range. Fading may also be caused.

The distance traveled by the direct ray in the troposphere from transmitting antenna to the receiving antenna and the field strength of this direct ray at the receiving antenna. If the reflection at earth is prefect, the magnitude of the field strength due to ground reflected ray will be approximately equal since the total distance traveled by the indirect ray is approximately equal to the distance traveled by the ray. However the reflection co-efficient at the ground is p then the magnitude of the indirect ray is equal. The direct ray and the ground reflected ray combine vector ally at the receiving antenna. The phase difference in the two field strength is caused by the following two factors, path difference and phase shift caused due to reflection from ground. We revel, some important properties of the propagation of very high frequency. The field frequency strength increases linearly with the height of the transmitting antenna, linearly with the height of receiving antenna, linearly with the square root of the effectively radiated power. The field strength varies with the wave length and inversely with the square of the distance. In all we can say earths curvature has many effects on troposphere propagation.

Assessing The Aspect Ratio Of Your Digital Image Collection And The Digital Picture Frame

blogger

Where resolution defines the measurement of total screen capacity, aspect ratio defines a determination of scale. The term expresses a relationship of width to height as a ratio. For instance, a common aspect ratio 4:3 indicates that there are 4 inches in width for every 3 inches of height. The ratio means the same thing with yards, feet, or millimeters, etc. Aspect ratio means the exact same for displaying either photos or video clips. The definition predates the computer age.

In order to recreate a photo properly, the display’s aspect ratio should ideally equal the aspect ratio of the photo produced from the electronic camera. If the two aspect ratios don’t match, the display can stretch the image, or alternatively it can chop edges off of the picture to make it fit (called cropping). Another choice is often to resize the image, keeping its original aspect ratio, in order to fit either the width or height of the screen. This leaves unused portions of the screen at the two ends of the other (perpendicular) axis.

Most popular digital camera models create 4:3 pictures. The very same aspect ratio was used in old model television sets. Newer widescreen television sets employ either an aspect ratio of 16:10 or 16:9. These aspect ratios permit the familiar panoramic effect. Achieving a panoramic view still needs a camera that employs the same aspect ratio. Some digital cameras and frames use other aspect ratios. These are uncommon in typical consumer electronics. They are more used by experts and hard core enthusiasts. The salient point is to steer clear of unconventional aspect ratios if you lack a specific need.

Most people usually wouldn’t be concerned with mixing any of the 4:3, 16:9, 16:10 aspect ratios between displays and cameras. They all are near the equivalent ratio. Nevertheless, if one aspect ratio is translated into another, some mild distortion or stretching occurs. The most common effect of mixing them is an unused part of your screen. This is often either above and below the picture, or on the left and right sides of the picture, to keep it centered, and with correct proportion. It only becomes unappealing if there is a sizable disparity between the two ratios of the picture versus the display.

It is worth reviewing the image resize options that come with the digital photo frame you are thinking about. A serious deficit of image resizing options applies to a tiny assortment of best-selling digital frames. These particular photo frames don’t support picture cropping, plus they might not maintain the particular aspect ratio of your re-sized photos. This entails translating the aspect ratio of your picture to the aspect ratio the photo frame uses.

If the two aspect ratios are the same to start with, this type of resizing performs properly. If starting with unmatched aspect ratios, your satisfaction with the picture distortion, even if only slight, isn’t likely. It happens to be especially disappointing when this distorts the exhibition of one’s whole photograph gallery.

There are still reasons to buy this type of digital frame, providing you edit the collection prior to copying photos to the frame. These often have decent trade-offs, such as a higher than usual image resolution, or a much lower cost, or both. Viewsonic’s 10.2 inch frame, reviewed here: http://digital-picture-frame-reviews.com/10-2-inch-best/ is such an example. Editing can require a considerable effort. Even so, it can be cost-effective. It’s typically acceptable only when you are aware of the photo frame’s limitation ahead of time.

Copyright 2011 Wayne A Hynes

Sony Bravia Xbr5 40 Review

blogger

While searching for puchasing LCD TVs, buyers regularly wonder “Who makes the best LCD TV?” Since LCD TVs are becoming intensely preferred, discovering who makes the best LCD TV is beginning to become crucial to today’s money-savvy client before making their purchase. So how does one identify who the best Sony Bravia xbr5 40 makers are? Any customer wondering who makes the best Sony Bravia xbr5 40 should first start looking into the backgrounds of LCD makers. Some makers have been in the business for years.
So how does one establish who the best Sony Bravia xbr5 40 makers are? Any patron wondering who makes the best Sony Bravia xbr5 40 should first start looking into the backgrounds of LCD makers. Some makers have been in the business for years. Their outstanding experience as well as their period participating in the business are critical testment to the standard of their LCD products. Sony, Samsung, Panasonic, Pointy , Hitachi, Toshiba and LG are all household well known names with due cause : the firms customarily produce superior customer electronics products. When asking the query, “who makes the best Sony Bravia xbr5 40 ?” this actually must be considered. Naturally, when it comes to interrogating who makes the best Sony Bravia xbr5 40, consumers’ own preferences will obviously play a part in their selection.
Of course, when it comes to questioning who makes the best Sony Bravia xbr5 40 , consumers’ own preferences will clearly play a role in their selection. Not all Sony Bravia xbr5 40 manufacturers make models loaded with every single features that a consumer might desire. Some treat Sony Bravia xbr5 40 size offerings, screen size, resolution, image output as priorities in their list, while others may focus on HDMI inputs, compatibilities, sound quality and other features. For instance, if you are looking for a Sony Bravia xbr5 40 to play video games, you might be interested in purchasing a Sony Bravia xbr5 40 that has the fast response time. So you need to assess various factors in order to really figure out which Sony Bravia xbr5 40 can best address your specific preferences.
Here’s the list of leading makers who makes the best Sony Bravia xbr5 40 from LCDTVDeal.com.
Samsung : As the planet’s leading electronics brand, Samsung is well known for its competitive costs and its capability to supply quality and trustworthy products. Samsung Sony Bravia xbr5 40 includes a selection of sizes from 15″ – 60″+. Most come with multimedia Computer / DVD / TV Inputs. One thing that actually sets Samsung aside from the contest is its mix of great quality and stylish design.
Samsung Sony Bravia xbr5 40 is generally thin and light weighing under a hundred pounds, yet piled high with plenty of great features. With retail costs range between $399 to $5,999, Samsung has a Sony Bravia xbr5 40 that fits each family’s budget. Sony : Sony Sony Bravia xbr5 40 has long been renowned for its high standard and sleek design. Creativity , creativity and technology come together into play in the creation of Sony Bravia Sony Bravia xbr5 40 s, bringing a rare level of realism and stunning clearness to your films, both visually and aurally. As one of the top LCD TV manufactures, Sony Bravia LCD TVs’ quality and sturdiness are among the best, though their price tags are also a bit higher than those of budget brands.

A Brief Introduction To Nextbase Protable Dvd Players

blogger

Key Features

One of the most important, if not the most important, components of a portable DVD player is its display, or screen. The size, and other characteristics, of the screen determine the quality not only of what you actually see, but also the overall dimensions, and weight, of a portable DVD player. Most LCD (Liquid Crystal Display) screens, nowadays, are TFT (Thin Film Transistor), or active matrix, in design, and offer bright, colour rich, results, even in conditions of bright ambient light. The Nextbase N2 SDV47 model, for example, is a tablet style portable DVD player, with a 7 inch, TFT display, while the Nextbase DVM235 model features a pop up, 3.5 inch, TFT display.

Screens as small as 4 inches, and as large as 17 inches, measured diagonally, are available, with 7 inches being typical. Do remember, however, that while a larger screen can be easier on the eyes, if you intend to view for long periods, the player, itself, and its batteries will, by necessity, also be larger, and heavier.

It may be that you wish, at some point, to connect a portable DVD player to your existing home entertainment system. If this is the case, connectivity is important, and you should look for the highest quality output connections appropriate to your system. These may include S-video, and coaxial, or optical audio outputs. You may also be looking for support of true digital surround sound, in the form of Dolby Digital, or DTS; Dolby Digital is an industry standard for commercial DVD recordings.

About Nextbase

Nextbase is a Hong Kong based manufacturer of high end audio/video products, with over 15 years experience in the portable DVD player industry. The company strives to incorporate new electronics technology into its range of exciting and innovative products, employs a strict quality guarantee system, in accordance with international standards, and has formed strategic partnerships with other leading players within the industry.

Conclusion

If you are planning to use a portable DVD player in a moving vehicle or in any other environment where it is likely to be subject to vibration, or the occasional shock, it is good idea to invest in a model that has skip protection. Similarly, there may be other considerations, particular to your circumstances, which mean that some features are more important than others. A portable DVD player with a large screen, for example, is fine, but may not be very convenient if you have difficulty fitting it into your bag, or briefcase, and disappointing, if its battery life is only an hour, or so.