Why must you be in direct sight of the transmitter to receive FM radio?

To get reception, you must be in direct sight of the transmitter – the signal doesn’t bend around hills or travel far through buildings.” Whereas, the BBC website says this:”Radio waves are used to transmit television and radio programmes. Television uses higher frequencies than radio.

Can an antenna transmit and receive at the same time?

Simultaneous Transmit and Receive (STAR) antennas are capable of sending and receiving a signal at the same time on the same frequency and can double communication data rates in wireless point-to-point communications.

What can affect radio waves?

As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering.

Does VHF need line-of-sight?

VHF radio waves propagate mainly by line-of-sight, so they are blocked by hills and mountains, although due to refraction they can travel somewhat beyond the visual horizon out to about 160 km (100 miles).

Is VHF radio line-of-sight?

Due to the way these radio waves travel, VHF is used when there is an unobstructed path between two radios. This is known as line-of-sight (LOS) communication. Let’s take a closer look at how VHF radio waves travel, and what this means for tactical and military efforts in the field.

Can you transmit and receive on the same frequency?

Current tactical communication systems are unable to simultaneously transmit (Tx) and receive (Rx) at the same radio frequency (RF), placing an inherent limitation on spectrum usage imposed by conventional duplexing and networking techniques.

Why do antennas radiate?

Radiation from an antenna is due to the time-varying current that is excited by the bound electrical signal applied to the antenna terminals.

What common problems could arise during transmission and reception of radio waves?

When the transmission and reception of the radio waves are done then the most common problem to see is the interference which is a simple phenomenon that can interfere with the wave interaction. Also, the destructive interference can interrupt the system if any pulse overlaps with another with the displacement.

Why is my VHF radio not working?

problems are not defects in the radio itself but caused by something external to your. radio. Here are a few of the more common causes for VHF radio transmitter issues. “Weak but clear” transmissions that extend out to your normal distances are signs of a possible microphone issue.

What voltage does a VHF radio use?

Most all VHF radios work on 12VDC. Your radio will either operate from a 120VAC to 12VDC power supply or a battery. Batteries will either have an AC charger or it may be charged directly from an engine alternator. A normal system will typically measure 12.4 to 13.8 volts DC.

Can a VHF radio be bench checked/serviced?

Should the above listed tests not identify the source of the problem, then the VHF radio should be sent to Raymarine’s Product Repair Center to be bench checked / serviced. Whereas VHF radios are considered a primary item of boating safety equipment, Raymarine recommends regular inspection and testing of VHF radios by their owners.

How to tell if Radio is trying to transmit?

The voltage should drop a bit when you transmit – this at least tells you that the radio is trying to transmit. It still does not tell you the signal is getting out of the radio or to the antenna. If you have a voltmeter on your power panel that should show the drop when you key the mike. We’ve got a 25-yr-old Uniden VHF Click to expand…