Output power curve of an antenna

My approach is that a radio wave is made from zillion of accelerated electrons which emit zillions of photons. Since the current flows in a open circuit, the antenna generator works against something like a capacitor. So I want to know, is my imagination comparable with the radio specialists knowledge? Could it be that the power output of an antenna often looks like below?The red line is the ideal sine curve. The axis to the right is the time, the other axis is the power output. The blue line is the curve in reality, which one can get from an a...Read more

What is an antenna tuner? Why bother with resonant antennas in the first place?

There are a lot of antenna tuners on the market that have various capabilities in terms of how they can allow random radiators to work with our transceivers. What exactly do they do? My understanding is that they can neutralize the imbalance between inductive and capacitive reactance so the transceiver can couple the most power out (or in) even though an antenna might not be resonant on a particular operating frequency, since overall impedance (Z) consists of three parts, two of which are reactance dependent on frequency: X(sub)L and X(sub)C...Read more

antenna system - Using the VHF port for 6m on an Icom IC-706mkIIg transceiver

My Icom IC-706mkIIg transceiver has two output ports:one for its VHF/UHF bands (i.e. 2m/70cm)one for the HF bands, and also 6m!I have a couple of broadband VHF/UHF antennas whose transmit specs include the 6m (50MHz) band, so I'd rather have the 6m band output on the VHF/UHF port. I understand for example that the Yaesu FT-817ND allows some configuration of which bands use which of its two ports, but do not see anything similar in my Icom's menu settings.Is there any modification available to move 6m handling to the IC-706mk2g's VHF port, wheth...Read more

antenna system - Lightning strikes nearby and coaxial cable

A direct hit on my home by lightning is very, very unlikely. However, many lightning strikes that hit Earth nearby are by far the main hazard for ham radio gear (in my opinion, after 60 years in the hobby). The huge electromagnetic pulse generated by such nearby strikes spreads in all directions at the speed of light.I have been taught that such EMP will induce voltage on antenna wires, power lines, guy lines, etc—anything that can serve as an "antenna" for the pulse will have a voltage induced, sometimes very substantial. Here's the question...Read more