Wall Clock Germany
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 VINTAGE 8 DAY WALL CLOCK GERMANY  US $24.99
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 Beautiful Antique German Mueller Schlenker 2 weight wall clock at 1900 US $1,025.00
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 CLOCK HANDS LOOP END MAIN SPRING 7 CLOCK KEYS AND 3 BATTERY CLOCK MOVEMENTS US $40.00
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 Gorgeous Antique German wall clock at 1900 US $371.00
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 Vintage New Haven key wind Wall Clock wood case US $9.99
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 VINTAGE TEMPUS FUGIT WALL CLOCK WITH WIND WEIGHTS US $125.00
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 Junghans Wall Clock Antique US $230.00
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 Antique 9 German Handmade CUCKOO CLOCKby Familie DrubbaTitisee Black Forest US $198.00
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 Kassel Cuckoo Clock from Germany US $64.95
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 Battery Clock Movement Quartz Kit 4 types of hands to choose from 9 16 shaft US $7.99
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 Figural Mahogany Large Dutch Atlas Zaandam Wall Clock 8 Days Two Brass Weights US $156.58
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 VINTAGE MID CENTURY STARBURST SUNBURST ELGIN EAMES ATOMIC ERA WALL CLOCK 60s US $280.00
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 VINTAGE MID CENTURY STARBURST SUNBURST ELGIN EAMES ATOMIC ERA WALL CLOCK 1950s US $255.00
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 German Wall Clock Exc Working Cond Circa 1890s US $389.99
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 Hamilton Tempus Fugit Wall Clock LARGE Old Beautiful US $49.99
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 Battery Clock Movement Quartz Kit 4 types of hands to choose from 11 16 shaft US $7.99
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 JUNGHANS IRON WALL CLOCK GERMANY GOOD LOOKING US $29.95
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 Krups Electronic Wall Clock Germany Very Rare 1974 US $48.99
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 Vintage Kundo Electronic KieningerObersfell Made in Western Germany No battery US $20.49
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 Nice German Black Forest Wooden Bird Cuckoo Clock Plays Blue Danube Sw Music Box US $74.95
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 Antique German Black Forest Friedrich Mauthe wall clock at 1900 US $205.00
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 Beautiful Antique German Paarmann Cohn wall clock at 1900 Rare Trademark US $321.00
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 JUNGHANS GERMAN RARE FREE SWINGER WALL CLOCK 100ALL ORIGINAL LOOKS RUNS GREAT US $118.50
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 Colorful German Vintage Musical Cuckoo Clock with Dancers US $75.00
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 OLD GERMANY CUCKOO CLOCK WORKS US $19.99
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 Vintage J Engstler Miniature German Wall Clock w Hummel Picture Key Wound US $6.99
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 BLACK FOREST CUCKOO CLOCK US $195.00
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 German Wall Clock by Mauthe US $700.00
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 A LATER ART DECO BAUHAUS JUNGHANS CHIMING WALL CLOCK US $51.00
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 GORGEOUS VICTORIAN RA GERMANY VIENNA REGULATOR WALL CLOCK RUNS CHIMES ORIGINAL US $102.50
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 Schatz Sohne Germany wall clock winding clock w key works great USS Essex US $12.75
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 2 VINTAGE CLOCKS TAKE A LOOK US $20.00
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 A Vintage Porcelain 8 Day Kitchen Wall Clock US $33.50
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 Antique E Schmeckenbecher Cuckoo Wall Clock made Germany 3 birds glass eyes US $45.00
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 VINTAGE ART DECO GUSTAV BECKER WALL CLOCK OPEN WELL US $1,070.00
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 ANTIQUE VINTAGE ENAMELWARE 8 DAY KITCHEN WALL CLOCK MAUTHE GERMANY US $65.00
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 Beautiful Antique German Keyhole wall clock at 1900 US $305.00
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 Beautiful Antique German Thomas Ernst Haller AG wall clock at 1900 US $162.50
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 VINTAGE CUCKOO CLOCK GERMANY COO COO CLOCK PARTS OR REPAIR BIRDS HOME DECOR WOOD US $10.75
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 ANTIQUE AMERICAN OFFICE 8 DAY WALL CLOCK JAPAN NEAR ALL ORIGINAL SEIKOSHA 1910 US $10.52
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 BATTERY POW WALL HANGING CHIMING CLOCK W CHAINS WEST GERMANY MADE US $12.95
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 Vintage TRENKLE Wood Wall Clock Steel Face W Germany Quartz 11x11 Battery Op US $42.99
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 VINTAGE UNIQUE DURATALE BY LEONARD ITALY BULOVA PEWTER WALL CLOCK Tiffany US $17.99
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 VINTAGE GERMAN BLACK FOREST OWL WALL CLOCK MOVING EYES CUCKOO FAMILY US $12.01
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 SWISS HEIDI HAUS COCKOO BLACK FOREST GIRL SWING WALL CLOCK SHARP US $45.00
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 SWIFT ANDERSON CLOCK AND BAROMETER WEST GERMANY PROJECT MARINE BRASS WALL SET US $69.99
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 3 VINTAGE CLOCK DIALS 2 BRASS 1 TRIPLE CHIME 1 WALL CLOCK 1 MANTEL US $.99
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 West Germany Wall Hanging Cuckoo Clock Bird and a Fox Berries weights pendulum US $10.50
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 Elegant 82 FRANZ HERMLE Wall Clock 351 020 45cm Movement W Germany US $69.99
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 Vintage 1970 Large Kitchen Wall Clock MOD DESIGN Yellow Orange Black Cordless US $49.99
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 Vintage 1930s 8 day German Art Deco Wall Clock KIENZLE Yellow Orange Brass US $79.99
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 Vintage 1950s German Wag Wall Chime Clock weight driven Mid Century Modern US $74.99
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 ART DECO REVERSE PAINTED GLASS ZODIAC KEYWIND PLANTER DANBURY CLOCK CO GERMANY US $299.99
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 Very nice and rare Wall Clock of Kienzle US $250.00
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 Beautiful Antique German Kienzle wall clock at 1900 US $310.00
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 HAMBURG AMERICAN GERMAN ANTIQUE RA WALL CLOCK ALL ORIGINAL LOOKS RUNS GREAT US $71.00
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 Antique German Wall Clock from 1920 US $1,900.00
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 ANTIQUE PORCELIAN FACE GERMAN MADE KEY WIND MINI WALL CLOCK US $59.99
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 Battery Clock Movement Quartz Kit 4 types of hands to choose from 15 16 shaft US $7.99
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 Antique GERMAN JUNGHANS WALL CLOCK 1890 1910 for SALE US $999.99
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 Vintage GERMAN Porcelain Plate 8 Day Wall Clock Runs Great US $90.00
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 Vintage Welby Sunburst Spindle Wall Clock Made in Germany US $140.00
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 VINTAGE BLACK FOREST WOOD CUCKOO CLOCK GERMANY TWO WEIGHTS US $10.00
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 Vintage JUNGHANS Germany Salins Edition wall clock 70s 80s pottery Kienzle US $58.00
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 Vintage KIENZLE Boutique Germany wall kitchen clock 60s 70s Panton Junghans US $64.00
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 Vintage SETH THOMAS Wall Clock GERMANY Wood Case From ESTATE Sale 4 JEWELS US $19.99
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 Kassel Black Forest Cuckoo Clock US $210.00
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 41mm CLOCK KEY for SCHATZ SHIPS BELL HERMLE KUNDO SWIFT TREND BULOVA US $6.95
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 BLACK FOREST LADY ON SWING WALL CLOCK MADE IN GERMANY US $18.99
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 HAMILTON BEAUTIFUL CLOCK MADE IN WEST GERMANY LANCASTER COUNTY US $350.00
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 Late 1800s or Early 1900s DRCM Kienzle Germany Beautiful Wall clock US $157.50
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 Late 1800s or Early 1900s Beautiful Vienna Regulator Wall clock Germany US $155.00
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 Antique Large German Wall Clock Circa 1880 Leaded Glass US $399.00
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 RARE AND UNIQUE JUNGHANS GERMAN ANTIQUE WALL CLOCK 100 ALL ORIGINAL SUPERIOR US $9.99
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 Vintage Original German 8 Day Kieninger Wall Clock US $250.00
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 LOOK NOS FRANZ HERMLE 151 031A 48cm Wall Clock Movement PARTS OR REPAIR US $9.95
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 Kassel™ Black Forest Cuckoo Clock US $300.00
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 A Kieninger Floor Clock Movement The Best Cable Drive Movrment Made US $95.00
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 KASSEL BLACK FOREST CUCKOO CLOCK COO COO DECORATIVE WALL CLOCK $85495 US $237.79
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 RARE Genuine Porsche Hood clock US $75.00
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Ntp Server Reference Clocks: What's Best Radio or GPS ?
A NTP Server is a network device that provides network servers and other network infrastructure with an accurate timing reference. A NTP Server obtains precise time from an external time source, such as radio time and frequency broadcasts or GPS. This article describes the external time references that are available to synchronise NTP servers and discusses the merits of each.
There are a number of radio time and frequency broadcasts that are available in various locations. The WWVB signal is a US based reference, DCF-77 in Germany and MSF in the UK. These radio time and frequency broadcasts provide a stable and precise source of time. Additionally, an indoor located radio antenna can be generally be used to receive these signals - lowering installation costs. However, radio signals can be affected by local topography - such as hills and valleys. There is no guarantee of radio signal reception even well inside the transmission range of the signal.
The MSF radio signal broadcast in the UK by the National Physics Laboratory recently moved from Rugby in the East Midlands to Anthorn in Cumbria. Since the move, it has been widely acknowledged that signal reception in the South of England has suffered - even though it is well within the physical reception range for the signal.
Local environments can also affect radio signals. Radio antennas placed inside metal cages or metal clad buildings can experience poor signal reception. Also, antennas located in a basement or underground may fail.
GPS utilised the Global Positioning System intended for worldwide navigation. Each GPS satellite has an onboard highly precise synchronised atomic clock - an ideal reference for NTP server timing.
The GPS system is a constellation of 24 orbiting satellites each broadcasting continuous time and positioning information. This information can be received anywhere on the face of the planet, providing an antenna can be provided with line of sight to the satellites.
GPS has a number of advantages over radio-based time and frequency broadcasts. Firstly, GPS can be received anywhere in the world and is not restricted by transmitter power and radio signal range. Secondly, the GPS signal is a much more accurate reference than radio solutions. Thirdly, GPS timing information can be received by anyone who can provide an antenna with a good view of the sky. However, GPS antennas do need to have line of sight with GPS satellites. Therefore, the ideal location for a GPS antenna is on a rooftop with a full 360-degree view of the sky. Additionally, if buildings or trees obscure the horizon in anyway, it can affect reception integrity. Roof-mounted antennas can significantly add to the installation costs of a NTP server system.
To summarise, radio and GPS based time and frequency references for NTP server systems both have certain advantages and disadvantages. However, the accuracy of GPS and the guaranteed reception, albeit with roof-mounted antennas, make it the reference of choice for NTP server systems.
About the Author
Dave Evans is an experienced technical author with many years experience of NTP Server and Time Server systems and solutions to ensure accurate time on computers and network infrastructure. Dave has been heavily involved in the architecture of dedicated NTP time server systems, synchronised digital wall clocks and atomic clock timing products. Please visit our web site to find out more about time server and NTP Server systems.
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