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Tuesday, 31 July 2007
Laptop For Radio Technician.
CODAN Multi-wire Broadband Dipole HF Antenna code 463
(European Union Election Observation Mission to ACEH 2007)
It's perfect and powerful.
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CODAN 463 series Multi-wire Broadband Dipole HF Antenna is a 3-wire terminated folded dipole HF antenna designed for broadband operation in fixed stations. It is available in multiple power levels up to 1 kW. The antenna can be mounted horizontally between two support systems, or as an inverted “V” using a single central support mast.
KEY FEATURES
Durability
CODAN C463 series HF antenna is made from lightweight, weatherproof materials designed to withstand extreme environmental conditions and wind speeds greater than 200 km/hr.
The wire elements are constructed of high quality, corrosion resistant stainless steel, with balun and load housings, and insulators made from UV resistant, durable moulded plastic.
Performance
Due to the antenna’s optimum performance over a wide HF range, an antenna tuner is not required — minimising cost and setup requirements.
Antenna performance is very similar in both horizontal and inverted "V" configurations.
The inverted V configuration provides a good overall solution for most base station applications with the added benefit of only requiring a single mast for installation.
For long range operation, the horizontal configuration is recommended.
Easy to install
CODAN HF antenna is supplied completely assembled and ready for erection with an inverted V mounting arm and detailed erection instructions.
SPECIFICATIONS
ElectricalFrequency 2–30 MHzPower rating 250 W PEP (125 W avg) 500 W PEP (300 W avg) 1 kW PEP (600W avg)Nominal impedance 50 .VSWR Generally less than 2:1RF connector type SO239MechanicalLength m (ft) 28 (91.9) insulator to insulatorWidth m (ft) 1.3 (4.27)Minimum mast spacing m (ft) 30 (98.5)Recommended mast height m (ft) 10–12 (32.8–39.4)Wind rating 200 km/hr (125 ml/hr)Packed weight 6.7 kgCarton dimensions 1435 mmx 165 mm x 165 mmMounting hardware Halyard, pullies and mounting arm suppliedWednesday, 25 July 2007
SCOTTEVEST Solar Panels Voltaic Solar Bags
How do you think if you use this Equipment in Emergency area?OK?
The solar panels enable you to recharge your USB compatible devices on the go, either while wearing the jacket or with the panels removed. When attached, the solar panels compliment the jacket’s design. The solar panels charge a small battery - about the size of a deck of cards. The battery powers your device almost immediately after the solar panels are exposed to sunlight. Once the battery is fully charged, the panels can be removed and your portable electronic device can tap into the stored power.Typical charge times in direct sunlight range from 2-3 hours, but direct sunlight is not required. The battery pack can charge any device compatible with Universal Serial Bus (USB) chargers, including cell phones, PDAs, Game Boys, MP3 players, and other mobile devices. (NOTE: USB cables are not included, but are readily available from numerous sources, including www.ziplinq.com, www.belkin.com, and Radio Shack). Also, check out our latest accessory, the Zipcord Retractable Mobile Phone USB Charger.
The solar panels can be attached to the following SeV jackets:
SCOTTEVEST Tactical 4.0 Jacket
SCOTTEVEST Classic Vest 4.0
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Voltaic Solar Bags
The Voltaic solar bags are mobile power generators, designed to charge your devices without tying you to a power outlet, which makes them ideal for traveling.
Just plug a standard car charger into the bag and recharge most small electronic devices including: cell phones, cameras, two way radios, PDA's, and MP3s. Note: it is not designed to charge laptops.
If you don't have a car charger, the bags come with a set of 11 standard adaptors for common cell phones and other devices. We also offer a full range of optional adaptors.
Embedded in the outside of the bags are three lightweight, tough, waterproof solar panels which generate up to 4 watts of power. This means quicker charge times!
Included with each bag is a Li Ion battery pack which stores any surplus power generated, so it is available when you need it - not just when the sun is up. The battery pack can also be charged using an AC travel charger or car charger (both included). This makes the Voltaic bags just as useful on the grid as off.
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Battery Pack
The battery pack clips inside the back pocket of the Voltaic solar bags and allows it to function as a mobile power reservoir, not just a solar charger.
Inside the battery pack is a 4,400m Ah at 3.6 volts Li Ion battery.
It includes:
Adapters/Chargers
The Voltaic backpack comes with a set of standard adaptors pictured here. To charge a device you can use a standard car charger, or a USB charger. There are also direct adaptors for popular cell phones, and a set of universal adaptors.
It also includes an AC travel charger and a car charger for charging the battery when solar charging is not practical.
In addition to these standard items, we offer a range of optional adaptors for cell phones, cameras, PDA's etc.
Solar Panels
Integrating the solar panels into the back pocket of the bag is a key (patent pending) innovation of the Voltaic backpack. It means that unlike a typical solar charger:
The panels are built into the back of the bag in a way that allows them to articulate, so the bag itself does not feel stiff or restrictive.
They generate up to 4 watts of power, enough to charge most portable electronics (other than laptops). A typical cell phone will take 4-6 hours to charge in direct sun- see approximate charging times.
The panels are built on a strong but lightweight
aluminum plastic composite, specifically selected to withstand the rigors of outdoor use.
Tuesday, 24 July 2007
SATELLITE PHONES
This Satellite phones allowed by UN and most important for you travel in danger area
Iridium’s satellite network is the only truly global communications network providing voice, paging, 160-character two-way short text messaging (SMS), emergency 911 service (dial sequence 00-911) and internet access services to subscribers anywhere on the surface of the earth. Even the polar caps have Iridium coverage!
The Iridium 9505A is smaller, more power efficient and more water resistant than the ground-breaking original Iridium phone, the Iridium 9500. The internet access is 2400 bps (direct dial circuit switched) or 10,000 bps* with our free SkyFile compression and email software. Includes: Iridium 9505, universal AC charger and international plug kit, high cap battery, mag-mount car antenna (with 1.5 meter cable), antenna adapter, DC charger, belt holster, hands free earpiece, and manual.
Options: external mast antennas (U-bolt and thread mount types), antenna cables, mag-mount vehicular antennas, high capacity batteries, external battery packs, watertight Pelican impact case, portable solar chargers, and fixed-site Iridium phones for PBX applications
Technorati Profile
How to describe how good an antenna is?
Four ”figures” describe how good an antenna is compared to the required performance:
(We will not deal with the term ”polarisation” in this respect). |  |
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SWRIf the impedance of the antenna is different from the impedance of the cable, the antenna will reflect back some of the induced energy through the feeder cable to the transmitter, which naturally is undesirable. Normally, the impedance of the cable is 50 Ω. If Ra indicates the impedance of the antenna, the standing wave ratio is defined as: SWR = Ra/50 Ω (if Ra is more than 50 Ω) SWR = 50/Ra Ω (if Ra is less than 50 Ω) Examples: If Ra = 50 Ω is SWR = 1.0 If Ra = 100 Ω is SWR = 2.0 If Ra = 25 Ω is SWR = 2.0 Consequently, it is of importance that the SWR is as close to 1.0 as possible thus obtaining the highest power being transmitted from the cable to the antenna. |
Directivity D
The directivity D is an indication of the capability of the antenna to conduct the radiated power ”to a certain site”.
Normally, omnidirectional or directional antennas are mentioned.
Omnidirectional:
An omnidirectional antenna with high directivity has a radiation being similar to a pancake.
Directional:
A directional antenna with high directivity has a radiation being similar to the cone of light from a projector.
 Omnidirectional |  Omnidirectional | Omnidirectional |
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 Directional |  Directional | |
Gain GThe gain of an antenna is defined as G = η x D, where η indicates the efficiency of the antenna. Consequently, in the gain value possible loss in the antenna is comprised. The η-figure is always less than the directivity. For most antenna types the own loss is so low that G = D can be considered. |
BandwidthThe bandwidth of the antenna is the frequency range, in which it operates properly, i.e. both gain and SWR are within the more specified limits. |
Antennas for Mobile Units
Land Mobile AntennasQuarter-wave Antennas: The most common vehicle antennas utilize the car roof as one half of the antenna system. The antenna is a so-called ”monopoly on ground plane”. The basic type is a so-called quarter-wave ( ¼ λ) antenna. The fact that the antenna being close to 50 Ω is utilized when the whip has a length of approx. 1/4 wave length at the operating frequency.  By lengthening the whip, the antenna gain will be increased. The gain will, however, again be reduced if the whip length is above 5/8 wave length. | |
| Colinear Antennas: In case higher gain should be achieved, so-called ”colinear” antennas should be applied, for which more radiating elements are stacked and operate together, thus concentrating the radiation in the horizon. The optimum mounting site is in the centre of the car roof, at which the optimum omnidirectional characteristics are achieved. | |
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Marine AntennasMarine antennas are in a way very similar to omnidirectional base station antennas except for the fact that usually intensified requirements as to mechanical sturdiness and corrosionresistance are made.  Marine antennas are similar to omnidirectional base station antennas but with intensified requirements of sturdines  Marine antennas are similar to omnidirectional base station antennas but with intensified requirements of sturdines Maritime communication is mainly taking place on medium wave, short wave and the maritime VHF bands. | |
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Portable AntennasQuarter-wave Antennas: Like mobile antennas portable antennas are mostly ¼ wave ”monopoly” antennas, which utilize the chassis of the portable radio as ground plane, i.e. as one half of the antenna system. This usually results in insufficient ground plane as well as the fact that the radiation from the portable radios is mostly very badly defined owing to the presence of the hand or body, and in general a low efficiency for portable antenna systems should be taken into consideration, both because of disadjustment loss and loss owing to ”overturned” radiation. | |
Half-wave Antennas: If, however, antenna whips with a ½ wave length are applied together with an adaptation circuit the antenna being independent of the cabinet can be achieved. The antenna functions ”in itself” and a considerable improvement of 5 dB as average value can be achieved (compared to a ¼ wave antenna on the same device). | |
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 Nowadays air craft antennas are an integrated part of the fuselage | |
Base Station AntennasBase station antennas can be omnidirectional, directional or have a radiation being specially constructed, the latter yielding the antenna a quite specific coverage range. |
Omnidirectional AntennasOmnidirectional antennas are mostly applied for communication with mobile units when the positioning is unpredictable in relation to the base station antenna. | |  Omnidirectional |
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Directional antennasDirectional antennas are applied at areas or in a limited area where the receiver of the transmitted signal is. | |  Link Connection (Directional) |
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Antennas with special custom-made directional characteristicsAntennas with special custom-made directional characteristics are applied for coverage of an accurately limited area, possibly an unsymmetrical area, usually with the purpose of not interfering with or being interfered by other radio systems. | |  Delimited coverage |