What is VHF propagation?

What is VHF propagation?

The primary mode of propagation for VHF radio waves is through direct waves. These travel in a straight line, becoming weaker as distance increases. Transmitting and receiving antennas must be able to ‘see’ each other for communications to be effective, so antenna height is critical in determining range.

How do you find the frequency of a repeater?

To listen to repeater contacts, follow these steps:

1. Use a repeater directory or website to find a repeater in your area.
2. Determine the repeater’s input and output frequencies.
3. Set up your radio to listen on the repeater’s output frequency.
4. Tune your radio as you do for FM signals.

How far can I transmit on 2 meters?

On VHF frequencies such as 2-meters, antenna height greatly influences how far one can talk. Typical reliable repeater range is about 25 miles (40 km). Some repeaters in unusually high locations, such as skyscrapers or mountain tops, can be usable as far out as 75 miles (121 km).

How do you identify a repeater?

How to Choose a Repeater

1. Ask Local Hams. The first place to check for repeater recommendations is with local hams that are active on VHF/UHF FM.
2. Check a Repeater Directory. The next place to look is in a repeater directory.
3. Search The Internet.
4. Listen.
5. Making a Contact.

How to make a RF Propagation MAP for a repeater?

Required Reliability – this figure displays the reliability to which the coverage is likely to experience. For more accurate coverage maps, you can increase this value, however the resulting coverage area will less. Maximum Range – this value defines the limit of the coverage analysis.

Where does the VHF propagation map come from?

It uses data gathered by Automatic Packet Reporting System-Internet Service (APRS-IS)from packet stationsin the amateur radio service. The map shows activity from the past hour.

How to create RF coverage map for va3xpr repeater?

A RF coverage map generated for the VA3XPR repeater in Toronto, Canada, using Radio Mobile Online. Have you ever wanted to create an RF coverage map to find out how good the repeater coverage would be from a certain location?

Is there a real time 50 MHz Propagation MAP?

VHF(50 MHz) Propagation Map: This map uses 6 meter spots to compile it’s 50 MHz propagation map. It is real time, but you must manually Refresh this page. Click on the map and the spots with the callsigns will be listed and is clickable. Click on the callsign for their detailed information.