Purchasing aviation headsets is a crucial step in protecting your hearing and flying safely, especially in smaller aircraft. Some people simply choose by reputation, buying either a Telex headset or Peltor headset because these are well-known brands popular in the aviation industry, but it isn't that simple.
Both brands produce quality products, but they also each offer a variety of headsets that work in different ways and may suit different needs. To choose the right style and model of aviation headset, you need to first understand what the manufacturers are talking about when they describe how their products work.
Both Telex and Peltor headsets come in a wide range of styles that offer varying levels of hearing protection. In fact, each offers different types of hearing protection as well. The three types are usually referred to as Passive Noise Reduction, Active Noise Reduction and Digital Noise Reduction. Some people refer to noise reduction as "noise attenuation," but the terms are interchangeable.
Passive Noise Reduction ? These are sometimes referred to as NNR headsets, and are the least expensive. They use insulation and thick padding to cut down on cockpit noise. The earphones are designed to create a tight seal around the ears. With these, you'll receive about 25 decibels of noise reduction. Most of this will be high-frequency noise.
Active Noise Reduction ? Like NNR, active noise reduction (ANR) headsets use insulation to protect hearing. In addition, there is an electronic signal that "cancels out" incoming noise to provide noise reduction in the low-frequency range. The electronic signal is not an audible sound, but a frequency pulse that matches incoming sound as an opposite signal. Quality ANR Peltor Headsets can provide up to 30 decibels of noise reduction depending on the brand.
Digital Noise Reduction ? The most expensive option also gives you the most protection because it adds a final level of protection beyond even ANR. In these, electronics monitor the actual surrounding sounds and mimic them with opposing signals to cancel the noise. Telex headsets and most other quality brands also feature a filtering system that prevents cancellation of non-repeating noises so that the wearer will be aware of changes in engine sound that could signal an emergency. Digital noise reduction provides the most protection in the mid-frequency ranges.
You should find out what decibel level of noise you are going to routinely be exposed to before shopping for any kind of aviation headset. (Smaller aircraft generally produce more noise than larger craft, and any prop plane will be significantly louder in the cockpit than a jet airplane) This will help guide you in your choice, since all Telex headsets and Peltor headsets clearly indicate the level of decibel protection provided.
You will also want to consider the type of microphone you prefer, the fit of the ear cups and other factors. If you visit aviation supply websites, you can also download detailed specifications for any number of headsets, including the most popular brands such as Peltor and Telex headsets; so that you can compare features side by side to find out which ones best suit your needs.
Perhaps the most widely used air conditioners are the window air conditioners. They are quite popular for heating and cooling in both domestic and commercial premises. The basic advantage of a window air conditioner is that unlike the central air conditioners and the split air conditioners, it fits well in the window giving a good look and it does not occupy any space of the room at all.
Moreover, window air conditioners do not need to be shifted every now and then from one place to the other. However, like any other air conditioning equipment, it produces noise, the intensity of which differs with the type and size of the window air conditioners. Constant noise can indeed be very disturbing and distressing to the home and surrounding residents.
It is, therefore, advisable for the consumer to compare window air conditioners by checking the sound power level labels on the unit or in the literature specifications. The noise levels are often given in decibel ratings and the higher the decibel level, the louder the unit will be. The sound pressure increases by a factor of ten for every 10-decibel increase. For example, 60 Decibels is 10 times louder than 50 Decibels and 100 times louder than 40 Decibels.
The compressor and the fan are combined in a single unit and mounted in the window air conditioners and this is the source of all the noise in the air conditioner. The other causes of noise could be worn bearings, cabinet rattles, dirty or rusty fan blades, worn rubber mountings and compressor wear. Regular maintenance can reduce the noise to some extent but with the passing of time, there is bound to be an increase in the level of the noise.
You should check whether your window air conditioner is vibrating or producing a rattling noise and if so, then it is not a normal situation. The reason for this can be improper installation or loose side panels. If, however, you hear a scraping noise, you should either take the help of an authorized service provider or you can also try to find out the cause and repair it yourself.
The following steps can help you in tracking the fault and repairing it:
You should tighten the screws holding the front panel onto the unit. You should check carefully the window all round the unit. You should then turn the window air conditioner on and press your hand against the sash. If you find that as you press your hand against the sash, the sound changes in pitch, then you should put some wooden shims in the gap between the window air conditioners frame and the sash. If, however, the pitch of the noise changes when you press your hand on the glass, you should use some insulating cellophane tape between the glass and the frame. You might have to use putty if that does not reduce the noise.
If you feel that the sound is originating from within the unit, you should take the unit out of the window and check to see if the fan blades are bent. If so, just bend them back so that they match the others.
Both Tony King & Masni Rizal Mansor are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.
Tony King has sinced written about articles on various topics from Gardening, Online Security and Careers and Job Hunting. Tony King is an avid flyer. He purchases his equipment & supplies at . is. Tony King's top article generates over 9900 views. to your Favourites.
Masni Rizal Mansor has sinced written about articles on various topics from Room Furniture, Debts Loans and Recreation and Sports. Masni Rizal Mansor provide tips and review on ,. Masni Rizal Mansor's top article generates over 74000 views. to your Favourites.