# How far can 400 MHz travel?

## How far can 400 MHz travel?

Thus the typical ranges with around 400 MHz frequency range with 1 W transmitter power are up to ~30 kilometers and up to ~80 kilometers with 10 W transmitter power.

## How far can 900 MHz travel?

The lower frequency radio waves of 900 MHz radios provide greater penetration through walls, trees and other obstacles, making it optimal for most non-line-of-sight applications. A typical AW900xTR Radio using high powered AW-15 15dbi antenna can go distances of up to 1500 feet with buildings and/or trees in the way.

What is the best frequency for distance?

VHF (136 – 174MHz) signals generally work best outdoors, giving a somewhat longer range for the same power output than UHF (400 – 470MHz). However, VHF signals really do not work well when there are obstructions like buildings around.

### How many MHz are in a km?

Megahertz to Wavelength In Kilometres Conversion Table

Megahertz [MHz] Wavelength In Kilometres
1 MHz 0.299792458 wavelength in kilometres
2 MHz 0.149896229 wavelength in kilometres
3 MHz 0.0999308193 wavelength in kilometres
5 MHz 0.0599584916 wavelength in kilometres

### How far can 915 MHz reach?

These sub gigahertz frequency antennas facilitate low bitrate long-distance transmissions, that can exceed 10 kilometers (6.21 miles). In North America, the 915 MHz frequency is specified for use by this technology, meaning that 915 MHz antennas are typically associated with LoRa in the US market.

How far will 25 watts transmit?

60 miles

Boaters often mount radios with the legal limit of 25 watts and, depending on the height of the antenna, can reach communication distances as far as 60 miles or more. Everyone on the water should have a marine radio, however not everyone needs that much power while enjoying water activities.

#### How far can 915 MHz go?

915 MHz is the center frequency of the band bounded by 902 and 928 MHz. Within this band, FCC regulations allow 50 mV/m electrical field strength, at a distance of 3 meters from the transmitting antenna.

#### Do walkie talkies work in cities?

In more urban areas, buildings will significantly block your signal. Most concrete, brick or metal structures reflect all radio waves. In cities, with a 2 Watt radio, you can expect a range of less than 1 mile.

Which frequency is used for long distance communication?

Deep-space communications
Signals are transmitted and received in two radio frequency bands: S-band (2 GHz) and X-band (8 GHz). The radio signals, travelling at the speed of light, took up to 50 minutes to cover the distance between the spacecraft and Earth!

## How do you convert MHz to words?

f(Hz) = 1 MHz Ă— 106 = 1000000 Hz

1. MHz to Hz.
2. MHz to kHz.
3. MHz to GHz.
4. Frequency conversion.

## What does MHz stand for?

megahertz
The megahertz, abbreviated MHz, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one million hertz (1,000,000 Hz).

Which is better 433MHz or 915MHz?

The 433MHz radio better penetrate through walls, in theory; but since the standard 50mm antennas are pretty short for both bands, the antennas are 2 times less shorter for the 915MHz band and, in practice, they work better for the 915MHz, than for the 433MHz band.

### How far does 2.4 GHz RC reach?

The 2.4GHz version of the HumRC Series is about 300 feet (90m) for remote control applications.

### How far will a 50 watt FM transmitter reach?

Watts in ERP Kilometers Rural area
30 13
50 17
100 24
300 42

What radio can reach 50 miles?

Uniden SX507-2CKHS Up to 50 Mile Range Two-Way Radio Walkie Talkies W/Dual Charging Cradle, Waterproof, Floats, 22 Channels, 142 Privacy Codes, NOAA Weather Scan + Alert, Includes 2 Headsets.

#### What frequency is helium USA?

It operates in the 2.4GHz and 915MHz bands in North America and 2.4GHz and 868Mhz bands in Europe.

#### What walkie-talkie has the longest range in city?

Like the very best long-range walkie talkies, these powerful radios have a range of up to 36 miles, putting them among the elite. Not only do these Midland 2-way radios come with an affordable price tag for their feature set, but they’re also backed by thousands of 5-star reviews.

What is the maximum range of a walkie-talkie?

The maximum range for a walkie-talkie is usually around 5 miles, but some designs can go all the way to 36 miles. However, this range differs greatly depending on your surroundings, and the maximum distance listed usually refers to when the devices are transmitting between two high points.

## What frequency has longest range?

Radio waves have the longest wavelengths in the EM spectrum, according to NASA, ranging from about 0.04 inches (1 millimeter) to more than 62 miles (100 kilometers). They also have the lowest frequencies, from about 3,000 cycles per second, or 3 kilohertz, up to about 300 billion hertz, or 300 gigahertz.

## How long distance communication is possible?

telephone and telegraph service over wire and radio systems between correspondents located at great (virtually unlimited) distances from each other.

How many MHz are in a second?

Megahertz to Cycle/second Conversion Table

Megahertz [MHz] Cycle/second
0.01 MHz 10000 cycle/second
0.1 MHz 100000 cycle/second
1 MHz 1000000 cycle/second
2 MHz 2000000 cycle/second

### What is MHz equal to?

one million hertz
The megahertz, abbreviated MHz, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one million hertz (1,000,000 Hz). The megahertz is commonly used to express microprocessor clock speed.

### How much does MHz cost?

\$7.99/month
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How does MHz work?

The megahertz, abbreviated MHz, is a unit of alternating current (AC) or electromagnetic (EM) wave frequency equal to one million hertz (1,000,000 Hz). The megahertz is commonly used to express microprocessor clock speed.

#### Can you use 433 MHz in the US?

Widely accepted, the 433Mhz frequency is however subject to some local restrictions like in the USA, Japan, Korea, among others. Therefore it is mainly used in the European Market. This frequency band is recommended if you require great transmission distance between transmitter and receiver.

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