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Message started by cromwell on Aug 10th, 2010, 5:12pm

Title: What is PMR 446
Post by cromwell on Aug 10th, 2010, 5:12pm

What is PMR 446 ?
PMR 446 is a short range, low powered radio communication service that does not require a license and has no running costs other that the minimal cost of re-charging the batteries.

Who can use PMR 446 ?
Anyone can use the service once they have bought the equipment.

What can it be used for ?
PMR 446 can be used for business or pleasure.

Can I use my PMR 446 whist driving ?
Yes as long as you remain in full control of your vehicle

What range can I expect from PMR 446 ?
Maximum range in a built up area is about 2 miles but much better performance is possible in favorable locations

How much will I pay for the radio units ?
Prices start from about 20 per pair and range up to 200 each for the professional models.

Specifications:
Frequency range: 446.000 - 446.100 (8 Channels)
Output power: 500mW ERP
Antenna: Non-removable integrated antenna
Technical Standard: ETS 300 296

Batteries:
Most units operate using either 4 X AAA or 3 X AA batteries. Those using 3 X AA batteries tend to have a much greater operating time before the batteries need replacing/charging.

Zinc Chloride: 'Normal' everyday batteries, cheap but don't last long and cannot be re-used without a specialist charger.

Alkaline: 'High Power' batteries which last up to 6 times longer than Zinc Chloride but again cannot be re-used without a specialist charger. Cost about 2-3 times that of Zinc Chloride.

Nickel Cadmium: 'Rechargeable' batteries. Reasonably priced and last about the same length of time as Zinc Chloride. Can be recharged up to 1000 times. Plug in the wall charger costs about 12.99
.
Nickel Metal Hydride: 'Long Life Rechargeable' batteries. Last about 3-4 times as long as Nickel Chloride batteries. Relatively expensive but prices are falling fast. You can expect to pay about 5.99 for 4 X AA or 4 X AAA batteries. Plug in the wall charger and 4 X AA batteries cost about 14.99. Can be re-charged up to 1000 times.

RECOMMENDATION: Without hesitation I would recommend the use of the Nickel Metal Hydride batteries for the regular user. The initial extra cost is paid back 1000 times over. Nickel Cadmium batteries are cheaper for those who don't mind charging their batteries up more frequently and Alkaline/Zinc Chloride batteries should mainly be used by operators who only use their equipment occasionally

Title: Re: What is PMR 446
Post by Steve on Aug 11th, 2010, 8:32pm

Pity its limited to 500mw, if it was a few watts the coverage would be much better

Title: Re: What is PMR 446
Post by cromwell on Aug 13th, 2010, 5:09pm

There is a mod around m8, I think.

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