How does a field strength meter work?
A field strength meter is an instrument that measures the electric field strength emanating from a transmitter. A field strength meter is actually a simple receiver. After a tuner circuit, the signal is detected and fed to a micro-ammeter or, in this circuit, a digital voltmeter (DVM).
How do you measure field strength?
Use E=AF*V where E is the field strength in volts/meter, V is the voltage received by the spectrum analyzer, and AF is the antenna factor. The units of AF are 1/meter. The antenna factor is antenna specific and is supplied by the manufacturer.
What is RF field strength?
Description. Technically a “power density” meter, the RF Field Strength Meter detects the electric field of radio and microwaves (RF) from . 5 MHz to 3 GHz, and expresses the field strength as power density (. 001 to 2000 microwatts/cm2).
What is the formula of electric field strength?
The strength of an electric field E at any point may be defined as the electric, or Coulomb, force F exerted per unit positive electric charge q at that point, or simply E = F/q.
What is an RF Power meter?
Radio frequency (RF) power meters are the electronic test equipment of choice to collect information, analyze RF power, and display information in an easy-to-read digital format. Engineers use RF power meters to measure and document pulsed RF signals, noise-like signals, and pseudorandom signals.
What is field strength of antenna?
With the gain of the dipole antenna of 1.625, we get Ka = 23 or 20 · log(23) = 27.2 dB. With this, the electric field strength is 7.42 V/m. In order to get the magnetic field strength, we divide this value by 377 Ω and get 0.0197 A/m or 85.9 dBµA/m.
How do I lower the SWR on my antenna?
If your antenna is mounted down low on the vehicle, like on the bumper or behind a pickup truck’s cab, the signal can bounce back to the antenna, causing a high SWR. To alleviate this, keep at least the top 12 inches of the antenna above the roof line, and position the antenna as high as possible on the vehicle.
How do you set a SWR meter?
Turn the radio to channel 1. Key the microphone (depress the button and hold it). Turn the knob on the SWR meter labeled “SET” or “ADJUST” until the needle reaches the setting position at the end of its range. While still keying the microphone, flip the switch on the SWR meter to the “REF” or “SWR” position.
Where is the electric field strength strongest?
The field is strongest where the lines are most closely spaced. The electric field lines converge toward charge 1 and away from 2, which means charge 1 is negative and charge 2 is positive.