5 Watt 2 Way Radio

amature radio

The specs say UP TO 2 mile range but it depends on weather, buildings, trees ,hills and valleys. There a lot of variables but most of the time they are good for 1/2 mile.


Have a Good Day !

Don

2009-01-04 10:43:11 by TED

2-way 5-watt QRP QSO 19-Dec-08 (excerpt) ... Joe Cool DXer ... K9EW N7EF ...

what would be your range estimate with 5 watts radio?

motorola has 1 or 2 watts.. does 5 watts radio. has longer range for this?

pls. advice.am looking 4 a longer range communication.

gkk is correct. For a given antenna, higher power will give greater range. In many cases, better antenna design and performance is often more important than actual transmitter power.
However, doubling transmitter power does not double your range. I'm a little rusty on my theory, but if I recall correctly, range is logarithmically related to power level change. For example, it will take about 4 times the power level to achieve doubling of range of coverage of transmission. So, it takes a significant power level increase to significantly increase range of coverage.
So, 5 watts will certainly give better range over 1 watt. But, sometimes the same effect may be achieved with a better antenna design combined with higher antenna mounting above ground.
All factors add-up together. So, the best of all worlds is: more power, better antenna, and higher antenna above ground combined.

2008-03-27 00:21:07 by a_joemar

Price: $89.99

NOAA/All Hazard Weather Channels with Alert and Weather Scan
9 Levels of VOX for Hands Free Operation
Vibrate Alert
50 Channels with Up to 36-Mile Range
387 Privacy Codes

Include type of antenna used when responding. Also, what kind of range is typical for a 5 watt 2 meter with rubber duckie?

10 meters is 28-29.5 mhz, if I remember correctly, and does propagate by reflection from the ionosphere during solar activity peaks. So, you could go quite a ways even with a simple vertical. Your best bet is a properly tuned long wire dipole. Mostly, you will only go line of sight, which varies with the height of the antenna and the orientation if using a long wire or a dipole. At ground level, with a properly tuned antenna, you might easily go 20-30 miles. With a little altitude,like I am at about 700 feet up a hillside from sealevel, in the direction I am facing, maybe 50 miles. Then again, with the ionosphere reflection, I could easily go a couple hundred miles, typically in rings every hundred miles or so. This is very near the CB band at 11 meters, and those guys used modified amateur equipment, linear amplifiers, to skip across the country. For 2 meters, strictly line of sight. You might get 4-5 miles to another person with an identical radio walking at ground level at best. It will be iffy at more than a couple of miles depending on buildings, terrain and such. I am at 700 feet above sea level, with open space to the east and a repeater I routinely use on the Seattle side of Puget sound is a couple thousand feet up on a mountain top, so the 35-45 miles between are no problem with 1 watt and a duck, and if I use a j-pole instead of the duck, I can use 100 mw to hit the repeater. A good antenna, tuned properly, working against a good earth ground is the best investment. Your mileage may vary. It all depends on terrain, altitude, antenna tuning and surrounding structures. Drop the duck in favor of a 1/4 wave, if you can. The longer 1/4 wave is a bit awkward because of the 19 inch length, but performs much better than a duck could ever hope to. And another thing, face the direction you want to go the furthest. Your body absorbs energy and your transmission pattern becomes sort of heart or ellipse shaped with the low point being the place where your body is relative to the antenna, and the pointed end being where you are facing. Your body interferes with the signal strength since you conduct electricity.

2007-03-10 19:26:45 by Zhuo Zi

Price: $189.99

Keypad lock, audible call tones, VOX--voice activated transmit with select audio accessories (not included)
Includes Lithium-ion rechargeable battery, drop-in charger, and swivel holster
Durable, lightweight design. Easy for employees to carry and hold all day, yet built to withstand everyday use
Requires FCC license. Compatible with Motorola Spirit GT,GT+, and XTN UHF radios.
Quickly copy the settings from radio to radio with the use of the optional #56517 (cloning, charging, storage) accessory

I have a portable Uniden Marine radio 1/2.5/5 watts. I am told to use the lowest wattage possible to get the job done. What can I expect under 'normal' conditions with the 5 watt, 2.5 watt and 1 watt settings?

VHF is generally considered "line of sight" communications. Repeaters are generally used to expand distances between stations. The Marine Radio frequencies, 156 MHz to 161 MHz is divided into multiple channels. Yes, you should use the least amount of input power or setting, to your final amp, to make a good communications. Atmospheric conditions and proper connection and impedance matching of your antenna to your radio for minimum SWR, all play into maximizing the signal going out.

Added info:
Don't know what "normal conditions" are out at sea. Too many variables with atmospheric conditions and the integrity of your equipment.

2008-05-24 21:32:51 by Dandy

Quote Electromagnetic radiation can be useful at practically all wavelengths. A radio transmitting 5 watts right next to my head is worse than one on my roof transmitting 500 watts. Moderate amounts of visible light are beneficial, while a high power visible light laser can easily be fatal. Modest amounts of UV exposure help our body to synthesize vitamin D3, while serious sunburn can be quite harmful, and a pattern of sunburn greatly increases the risk of skin cancer. X and gamma rays and other high energy exposures do carry risk of damage. Yes, the energy of a photon is inversely proportional to its wavelength. Quote
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What determines the watt and sq feet to do harm to the body.Does 2 watts propagate a mile and 7 watts propagate 12 miles ?

How close does the watts have to be for the intensity of the transmitting powerto do harm.

simple watts and square feet are insufficient to give an answer, because radiation at different wavelengths has different effects.

harm to the body occurs because of absorbed radiation.
depending on the wavelength, this can be measured by various means.

propagation of radiation depends on degrees of freedom. laser light traveling down an optical fibre loses very little energy along its path, whereas light propagating through free space spreads out in three dimensions.

2009-03-23 13:11:14 by Rob