What happens as the frequency of a signal passing through coaxial cable is increased?
Coaxial cable can impose some significant loss in signal strength compared to other types of feedlines, such as ladder line or twin-lead. As signal frequency increases the skin effect becomes more pronounced. That is, the “depth” within the conductor through which currents flow becomes reduced as frequency increases.
What is the impedance of the most commonly used coaxial cable in typical amateur radio installations?
50 Ohms
The most commonly used coaxial cable impedance for amateur radio installations is 50 Ohms.
How does RF ground affect the radiation efficiency?
Effect of RF antenna ground on radiation efficiency The resistance if the RF ground system will naturally introduce losses into the overall antenna system. If the resistance is high, then this will absorb a significant proportion of the antenna power supplied to it.
How does a RF ground system work on a monopole?
An RF ground system forms an integral part of the operation of a monopole antenna. In terms of the operation of a monopole, the reflection in the ground means that it appears that there is an image of the top half of the antenna below the ground – in other words like a vertical dipole.
Why do I need grounding points for my Radio?
Another popular belief is each piece of desktop equipment needs to have separate leads to a grounding point, so RF doesn’t move from the chassis of one piece of gear to the chassis of another through daisy-chained cabinet grounds.
What does it mean when it sounds like RF feedback?
What sounds like RF feedback usually is RFI, but other things can sound very similar. We should never assume distorted or bad audio, or other anomalies during transmission, are always RF feedback or RF generated problems. An “RFI” problem might be direct current ground loops in station audio wiring, or in control wiring.