Friday, February 1, 2008
Specifying Delay Lines
THERE HAS BEEN a tremendous growth in the computer, television and radar fields. As a result, the demand for components that give time control over pulse information has led to the development of a great variety of delay lines; delay lines that find use in systems that relate electrical information to time. Computers, television studios, telemetering systems, guided missiles, navigation systems, identification coders and decoders, radar systems and video tape recorders are typical systems that use delay lines.
The selection of the proper delay device for a given application is not only important from an economic standpoint, but it can also contribute to the ultimate success or failure of a system. In order to understand and compare the different types of delay lines, it is first necessary to define certain parameters.
Basically, there are two types of delay lines: electromagnetic lines (http://www.ElectromagneticDelayline.com) and sonic delay lines(http://www.SonicDelayline.com) There are important differences between these two types. The electromagnetic line is limited in its time delay to rise time ratio to 250 :1. This limits the upper frequency response but the passband starts at d-c and extends to its 3 dB cut-off point. For long delays, or where the required frequency response is in the Megahertz range, this 3 dB cut-off point imposes a severe limitation and makes the choice of a sonic line mandatory at these higher frequencies.
The sonic delay lines can be broken down into two basic types: magnetostrictive and solid (ultrasonic) lines (glass and quartz). Both types feature very high frequency response and excellent temperature stability. However, their attenuation (40 to 70 dB), narrow bandwidth, and poor pulse fidelity has lead to the popularity of electromagnetic delay lines. Electromagnetic Lines
The electromagnetic lines are divided into two groups: distributed and the lumped constant delay lines. The distributed delay line is further broken down into two categories The stick line closely approximates a transmission line. It is fabricated by winding a coil (either a solenoid or a multilayer) on a rod (glass, ceramic or phenolic) that has been covered with a silver or copper coating. This conductive coating is the ground conductor. Between the coil and the ground plane is a thin dielectric layer. The coil provides a continuous and uniform inductance along the rod. The coil of wire and the ground plane act as a capacitor. The higher the dielectric constant of the dielectric layer, the greater the capacity.
The delay of the line, Td, is a function of the total inductance and capacitance (Td = √LC), as is the impedance (Z = √L/C). The stick lines generally do not exceed 2 μsec of delay and are limited in their figure of merit, rarely exceeding a value of 10, which requires a rod six inches long. Not all impedances are possible for every delay, due to a limit on obtainable capacity. The attenuation of the small delays is generally very low since these are wound with heavy wire. When the delays approach 2 μsec, however, the attenuation increases greatly and reaches a maximum of about 3 dB. The temperature coefficient is generally about 150 ppm from -55 to + 105 C. Sizes of the stick lines usually range from about 3/8" x 3/8" x 2" to 1/2" x 1/2" x 6".
Paul Alessandrini is an experienced MRI-RFI filter technician. Additional information regarding Fil-coils MRI, Delay Lines, Tempest, and HEMP filters can be found at http://www.custompowersystem.comFirst Financial Bank Ohio
Insurance Consultant Springfield
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The selection of the proper delay device for a given application is not only important from an economic standpoint, but it can also contribute to the ultimate success or failure of a system. In order to understand and compare the different types of delay lines, it is first necessary to define certain parameters.
Basically, there are two types of delay lines: electromagnetic lines (http://www.ElectromagneticDelayline.com) and sonic delay lines(http://www.SonicDelayline.com) There are important differences between these two types. The electromagnetic line is limited in its time delay to rise time ratio to 250 :1. This limits the upper frequency response but the passband starts at d-c and extends to its 3 dB cut-off point. For long delays, or where the required frequency response is in the Megahertz range, this 3 dB cut-off point imposes a severe limitation and makes the choice of a sonic line mandatory at these higher frequencies.
The sonic delay lines can be broken down into two basic types: magnetostrictive and solid (ultrasonic) lines (glass and quartz). Both types feature very high frequency response and excellent temperature stability. However, their attenuation (40 to 70 dB), narrow bandwidth, and poor pulse fidelity has lead to the popularity of electromagnetic delay lines. Electromagnetic Lines
The electromagnetic lines are divided into two groups: distributed and the lumped constant delay lines. The distributed delay line is further broken down into two categories The stick line closely approximates a transmission line. It is fabricated by winding a coil (either a solenoid or a multilayer) on a rod (glass, ceramic or phenolic) that has been covered with a silver or copper coating. This conductive coating is the ground conductor. Between the coil and the ground plane is a thin dielectric layer. The coil provides a continuous and uniform inductance along the rod. The coil of wire and the ground plane act as a capacitor. The higher the dielectric constant of the dielectric layer, the greater the capacity.
The delay of the line, Td, is a function of the total inductance and capacitance (Td = √LC), as is the impedance (Z = √L/C). The stick lines generally do not exceed 2 μsec of delay and are limited in their figure of merit, rarely exceeding a value of 10, which requires a rod six inches long. Not all impedances are possible for every delay, due to a limit on obtainable capacity. The attenuation of the small delays is generally very low since these are wound with heavy wire. When the delays approach 2 μsec, however, the attenuation increases greatly and reaches a maximum of about 3 dB. The temperature coefficient is generally about 150 ppm from -55 to + 105 C. Sizes of the stick lines usually range from about 3/8" x 3/8" x 2" to 1/2" x 1/2" x 6".
Paul Alessandrini is an experienced MRI-RFI filter technician. Additional information regarding Fil-coils MRI, Delay Lines, Tempest, and HEMP filters can be found at http://www.custompowersystem.comFirst Financial Bank Ohio
Insurance Consultant Springfield
Military Schools In Georgia
South Dearborn Middle School
Battlefield 2
Barbecue Restaurant Start
Satellite Surveillance Live
Kodiak Trailer Travel
Help Desk Support Job Description
Ipod Wholesale
Cingular Prepaid Wireless Phone Service
Care Care Skin Skin Treatment Treatment
Elmwood Fitness Center
Dayton Metro Library
Factory Outlet Shopping
Flower Gift Shop
Attribselect Bag Bargain Bath Bed Bed Cal In King Product Sheet Size
Go See
Select Comfort Mattress
Boot Hiking Lady
New Orleans Story
Underage Drinking Law In Pennsylvania
Kt18
06 Crystal Ice
Gasparilla Inn Cottage
Triton Titanium Band Wedding
Man Health Magazine South Africa
Antenna Cb Radio Whip
2006 Award Europe Kanye Mtv Music Video West
Information Mesothelioma Pleural
Irish Extrasensory Perception
Costume Pattern Sheep
Beginner Gardening Guide Hydroponics Soilless
Beauty Online Tip
Kt56
Mexican Menudo Recipe
Maria Jesus Franc
Moody Garden In Galveston Texas
Ipod Sony Speaker
Chris Evert Lloyd
Direction Map Travel Uk
Calculate Poker Odds
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Blahnik Designer Manolo Shoes
Car Insurance Motor Online
Living Room Furniture With Chaise Chair
Ball Baseball Sports
Massages Mays Landing New Jersey
Philadelphia Worker Compensation Attorney
Kt171
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Diego Fair Job San
Fancy Diamond Jewelry
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Oregon Beach House For Rent
Mortgage Investment Property
Lowell Newspaper Obituary Sun
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Cat Snow Thiokol
Special Retirement Gift
Costume Disco Man
Washington National Shop
Sleep Innovation
Windows Xp Migrate
Farmer In Kokomos Market Restaurant
Kt101
Applied Boyd Business John Strategy
National Geographic Magazine Archive
Bentonville Arkansas Rehabilitation Center
Commodity Trading Trend
Box Candy Chocolate
0 Advance Card Cash Credit
German Aircraft
Basket Gift Holiday Kosher
Florida Panhandle Fly Fishing
Holiday Pfaltzgraff Rose Tea
Nam News Travel Viet
Global Warming Summary
1000 Hotel In Seattle
Basketball Drill Simple
Kt129
Premade My Space Layouts And Templates
Kt111
Honda Exhaust Systems
Career Career College Concorde From Information
Hamptons International Film Festival
Miami Beach Condo Rental
Online Advertising Prices
Kt69
Pay Scale Chart
Motorcycle Kelly Blue Book
1950 S Designer Leather Chaise Lounge
Andreas Auto Coffee Grand Hot San Theft
Choice Books
Used Sail Boat Winches
Goodwill Credit
Dual Car Stereo
Attorney Business Legal Other Services
Bag Label Lunch
Holidays In Tuscany Villas
0800 Free Phone Number
Container Gardening Potting Soil
03 Cobra Mods
Forex Signal Strong Trade
Sugar Free Banana Bread Recipe
Elvis Costumes Children
Car Insurance Lakeville Minnesota Quote
Depot Garden Home Shed
Braun Coffee Maker Replacement Carafe
Apple Ipod 10gb
Bolle Safety Glasses
Hockey Store Pittsburgh
Stress Factory New Brunswick
Club Copacabana In New Night York
0 Chicago Down Mortgage
Web Site Metro Tv Indonesia
15 Dancing Nov Result Star
Magic School Bus Electricity
Site Design Services
Building Concrete Construction Curb Housing Radius Small Turning
Branch Farmer Newspaper
Purdue Crew
Entry Job Level Oil Rig
Depression Glass Identifying
Canada Engineering In Job
Sony Ericsson 226
Drury Inn The Woodlands Texas
05 Acura Rl
Oregon Legal Malpractice Attorney
Business Candy Entertainer Machine Vending
Nursing Schools In Utah
1600 Love Sailing Ship True
Chaise Rocker Recliner With Storage Arm
Fleece Bed Jacket
Tennis Court Soundtrack
Ice Cream Man Tab
Air Bed Mattresses
Meucci Pool Cue
Construction Contractor Monitoring Performance
Hosta Night Before Christmas
Red Lion Inn Portland
Boot Boy Snow Toddler
Kt47
Kt40
Accounting Principle
Benefits Of Vitamin E
Camera Cell Phone Sale
Conversation Pit
Gaiam Harmony
G I Joe Action Figures
Grants Farm
Hotel Omni Pa Philadelphia
Dating Man Older Personals Woman Younger
Tulsa Nightlife
Gsw Hot Tank Water
Hotels West Palm
Dior Eye Glasses
Sail Boat Rental Tampa
Al Gore Photo
Detroit Beauty Day Spa
Planning An Outdoor Wedding
Center Pet Rescue
Kt131
10 Acne Product Top
Celebrity Foot Pretty
Georgian College Courses
Car Insurance Las Vegas
Eastern Orthodox Crosses
Fur Museum Trade
Man S Skin Care
National Oil Lube News
White Button Shirt
News Biometrics
Forex Free Learning
Background Free Myspace Scarface
Electric Coffee Grinder
Clause Costume Kid Santa
Carolina Charter North Sailing Yacht
Actor List Male
2008 Nissan Price Skyline
1 Chapter
Sexy Womens Halloween Costume
Slow Cooker Hamburger Recipe
Florida Beach Front Rental
Prom Hair Style Down Dos
Sell Las Vegas Time Share
Brilliant Crystal Jewelry
Celebrate Jesus Celebrate
Prenatal Fitness Dvd
Kt175
Dodo Pajaro
Patriotic Shirt
Explanation Of Crm
Condominium Mississauga
Christian Long Shirt Sleeve T
Jewelry Designer Diamond Ring
Dental Implant Miami
Card Credit In Mbna Sign
Time Share In Orlando Fl
Shockplay Table Tennis
06 2005 Hockey League National Nhl Official Official Rule Rule
Renaissance Artwork
Visio User Guide
Infocus 7200
Craigs Diet Healthy Jenny Living No Recipe Required
Jeffrey Lichtman
Addy Award Winners
Fancy Cursive Free Font
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