http://jawsafl.com/universal-gps/
USB Universal Travel Charger for all devices?
I need a travel charger that allows me to charge multiple devices through an outlet 120 volts. I usually travel with a Nikon digital SLR, Fuji point and shoot camera, Motorolla Krzr Cell Phone, Nextel cell phone, Zen Vision W, Garmin Gps, Blackberry and my wife. I managed to limit my packing 2-3 Chargers, but I'm hoping that there was a device for sale that can charge all these elements. I hope Some of these devices (eg blackberry, garmin, moto phones) do not need a device property. Any ideas? J.
Go to the source with the only adapter with all parts, including cell phone adapters.
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Universal Usb Car Charger (Compatible with All GPS Brands) $24.97 |
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Universal 5.5mm Sma Gps Antenna for Magellan ANT06A GPS High Quality $6.99 |
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New Universal GPS/MP3 Player/Phone/Cell phone Car Windshield Holder Mount $6.09 |
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UNIVERSAL Gps Accessory /Leather Case/3.5 DISPLAY UNITS $3.00 |
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(1) SANAV MK-76 Mini Gps ANTENNA magnet base Gold SMB connector universal fit $9.99 |
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Day Tripper Gps Universal Carrying bag L@@K! 6″ Inches! $5.49 |
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Universal Car mount vent bracket holder cradle for gps/pda/ipods $6.09 |
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Day Tripper Gps Universal Mini Usb Car Charger L@@K!!!! $4.09 |
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GS Traq universal tracker- High Sensitivity GPS chipset $207.59 |
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Universal GPS Portable Dash Friction Mount for Nuvi $17.84 |
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Hard Universal Case for Tomtom One V2 V3 V4 XL GO GPS $5.52 |
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ME-USDM: Universal Dash Mount w/ holder for Garmin Tomtom Magellan Navigon Gps $15.47 |
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Universal Windshield Car Cradle Mount Holder For Mobile PDA Psp Gps Iphone $6.09 |
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Universal Car Mount Vent Windshield Holder GPS EHE50P $14.16 |
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TomTom Universal GPS air Vent Mount $19.99 |
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Universal Mp3 IPhone 3G Gps Mobile PDA Car Holder Mount $4.98 |
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universal car mount vent bracket holder cradle for gps/pda/ipods/iphone/itouch $6.09 |
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Universal Car Windshield Vent Phone Pda Gps MP3 MP4 Holder Mount $6.09 |
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ME-TTDM: Universal Dashboard Mount for TomTom, Garmin Nuvi, Magellan, Mio Gps $8.99 |
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Bracketron Universal Window Mount with Usb Charger for GPS MP3 SMARTPHONES $29.98 |
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Universal 7″ GPS Sun Shade for All 7inch Gps Navi W730 $13.95 |
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Universal Car Holder For PDA cellphone GPS Mp3/4 iphone itouch Iphone 4s $4.98 |
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Universal 6inch Gps Sun Shade @ MIO Gps Garmin #W610 $9.99 |
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GS Traq universal tracker- High sensitivity GPS chipset $207.59 |
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UNIVERSAL CAR MOUNT HOLDER STAND CRADLE ACCESSORY For Mobile Phone IPHONE GPS $6.09 |
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Universal Car Mount Holder for Mobile Phone Gps Pda MP4 $8.00 |
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TomTom – Universal Gooseneck Mount Gps Receiver $31.93 |
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Universal Sunshade for 4.3Inch 5Inch Car Gps Navigation $8.99 |
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Universal Car Mount Holder for PDA GPS Ipod Iphone 3G $1.57 |
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Radio Shack Universal GPS Dashmount Nonskid base for all GPS $8.85 |
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UNIVERSAL CAR MOUNT HOLDER STAND CRADLE ACCESSORY For MOBILE PHONE IPHONE GPS $6.09 |
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Gilsson UCAC5 Universal GPS AC Power Cord NEW $9.97 |
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Rocketfish RF-GCHDC Universal GPS Home Charger $3.82 |
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ME-USDM: Universal Friction Mount w/ holder for Garmin Tomtom Gps, iPhone Droid $9.99 |
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Universal Bike Bicycle Mount Holder Mobile PDA PSP GPS $4.99 |
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NAVGEAR 14027 Universal Gps Vent Mount – BRAND NEW AND SEALED! $6.75 |
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Universal Gps Car MOUNT HOLDER FOR GARMIN NUVI 255 260 260W 200 255W 265w $7.99 |
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NAVGEAR 14027 Universal GPS Vent Mount – BRAND NEW AND SEALED! $6.75 |
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Navigon Universal GPS 3-Way in Car DC Vehicle Power Supply Adapter Max 7100 5100 $3.58 |
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Xentris 60-1941-01-BB Universal Windshield Mount for Gps Ipod MP3 $9.61 |
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Rocketfish RF-DAC01 Universal Gps Wall charger 2 USB $6.99 |
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Rocketfish Universal Gps Home Charger RF-GCHAC $2.75 |
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Bracketron Ugc-100bl Universal Gps Replacement Car Charger (ugc100bl) $15.40 |
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Pyle Plnv35 3.5″ Touch Screen Universal Portable Gps Navigation $123.73 |
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NAVGEAR 14027 Universal GPS Vent Mount New $6.99 |
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Bracketron Ugc-229-bl Universal Gps Car Charger Pwr With 4 Adapter Tips $14.63 |
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Leather Universal Gps Case–NIP $4.00 |
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ROCKETFISH UNIVERSAL GPS CAR CHARGER $5.00 |
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Rocketfish Universal Gps Windshield Mount $9.99 |
Installing a Ntp Server Using a GPS Timing Source
Network Time Protocol (NTP) is one of the Internet’s oldest protocols still used, invented by Dr David Mills from the University of Delaware, it has been in utilized since 1985. NTP is a protocol designed to synchronize the clocks on computers and networks across the Internet or Local Area Networks (LANs).
NTP (version 4) can maintain time over the public Internet to within 10 milliseconds (1/100th of a second) and can perform even better over LANs with accuracies of 200 microseconds (1/5000th of a second) under ideal conditions.
NTP works within the TCP/IP suite and relies on UDP, a less complex form of NTP exists called Simple Network Time Protocol (SNTP) that does not require the storing of information about previous communications, needed by NTP. It is used in some devices and applications where high accuracy timing is not as important.
Time synchronisation with NTP is relatively simple, it synchronises time with reference to a reliable clock source. This source could be relative (a computer’s internal clock or the time on a wrist-watch) or absolute (A UTC – Universal Coordinated Time – clock source that is accurate as is humanely possible).
Atomic clocks are the most absolute time-keeping devices; however, they are extremely expensive and are generally only to be found in large-scale physics laboratories. However, NTP can synchronise networks to an atomic clock by using either the Global Positioning system (GPS) network, a specialist radio transmission or over the Internet. However, it must be noted that Microsoft strongly recommends that an external based timing should be used rather than Internet based, as these can’t be authenticated.
GPS is an ideal time and frequency source because it can provide highly accurate time anywhere in the world using relatively cheap components. Each Gps Satellite transmits in two frequencies L2 for the military use and L1 for use by civilians transmitted at 1575 MHz, Low-cost Gps Antennas and receivers are now widely available.
The signal transmitted by the satellite can pass through windows but can be blocked by buildings so the ideal location for a Gps Antenna is on a rooftop with a good view of the sky. The more satellites it can receive from the better the signal. However, roof-mounted antennas can be prone to lighting strikes or other voltage surges, so installation of a suppressor inline on the Gps Cable is highly recommend.
The cable between the GPS antenna and receiver is also critical. The maximum distance that a cable can run is normally only 20-30 metres but a high quality coax cable combined with a GPS amplifier placed in-line to boost the gain of the antenna can allow in excess of 100 metre cable runs.
A GPS receiver then decodes the GPS signal sent from the antenna to a computer readable protocol which can be utilised by most time servers and operating systems including, Windows, LINUX and UNIX.
The GPS receiver also outputs a precise pulse every second that GPS Network Time Protocol (NTP) servers and computer time servers may utilise to provide ultra-precise timing. The pulse-per-second timing on most receivers is accurate to within 0.001 of a second of UTC.
GPS is ideal in providing NTP time servers or stand-alone computers with a highly accurate external reference for synchronisation. Even with relatively low cost equipment, accuracy of hundred nanoseconds (a nanosecond = a billionth of a second) can be reasonably achieved using GPS as an external reference.
About the Author
Richard N Williams is a technical author and a specialist in the telecommunications and network time synchronisation industry helping to develop dedicated time server products; ethernet clocks, GPS time servers, NTP servers, digital wall clocks, atomic clock servers and SNTP time servers. Please visit us for more information about NTP products and NTP servers
