How do you calculate cable loss?

How do you calculate cable loss?

You can measure cable loss by placing the short end of the cable in the meter; once the signal reflects back, you can calculate the power loss of the cable. Most cable and antenna analyzers have a cable loss mode that displays the average cable loss of a particular frequency range.

How much loss is from RG58?

RG-58 (50 ohm) is about 0.195″, quite lossy, suitable only for mobile installations (typically < 20 feet, < 150 watts). RG-6 (75 ohms) is about 0.332″, typically used for cable/satellite TV.

How much loss is considered acceptable in the antenna system?

Different systems utilize different acceptable return loss limits, but 15 dB or better is a standard system limit for antenna systems and cable.

How do you reduce cable losses?

How to minimise voltage drop

1. Use larger cables.
2. Spread the load.
3. Divide the load.
4. Reduce load where it doesn’t affect performance.
5. Improve control.
6. Demand Side Management.

How do you calculate power loss and distance?

Calculate line loss as the square of your current multiplied by your calculated resistance: P(loss)=I²R Using Step 1, you may substitute for I, leaving an equation of: P(loss)=P²R/V² This presents a fundamental axiom of electrical theory: line loss is greatly decreased by an increase in voltage.

What is the difference between rg174 and RG316?

They both have a small diameter, are flexible, and both have a higher signal loss than larger diameter cables. The main differences are that RG316 coax has a far lower and higher temperature tolerance due to its FEP outer jacket, which may be reflected in the higher price of RG316.

What is the electrical difference between RG58 and RG 8 coaxial cable?

What electrical difference exists between the smaller RG-58 and larger RG-8 coaxial cables? These are probably the two most commonly used 50 ohm coax types; the RG-8 is thicker, less flexible, and as such has lower loss than the RG-58 coax. Just remember that as a general rule of thumb, a larger cable means less loss.

What is a good antenna return loss?

While different systems have different acceptable return loss limits, 15 dB or better is a common system limit for a cable and antenna system. The return loss scale is normally set up from 0 to 60 dB with 0 being an open or a short and 60 dB would be close to a perfect match.

Why return loss should be less than 10 dB?

a 10 dB return loss is not particularly good. As Vadym Slyusar says, it roughly corresponds to a VSWR of 2. It also limits the efficiency to no more than 90%, just due to the reflection of 10% of the power. It gets complicated for reflection amplifiers, where the return loss can really be negative dB!

What ohms for feed line losses?

Feed-line losses are resistive and dielectric heating. Software like TLD usually model everything on 50 ohms, but you can model on any other impedance just as well.

Can an odd quarter wave feed line be used for low impedance?

An odd-quarter-wave feed-line will transform that to a low impedance, but then it won’t work on its fundamental. The solution is to pick a line length in-between, so you get a mediumimpedance transformation on both bands.

What is the difference between antenna loss and feed line loss?

Antenna losses are resistive and ground heating. Feed-line losses are resistive and dielectric heating. Software like TLD usually model everything on 50 ohms, but you can model on any other impedance just as well.

What size coaxial cable for 20 meters?

75 ohm coax is 216 ft long, VF .82 guesstimated and is a perfect 1/4 multible for 17 and 20 meters. The feed Z xmitter end is 40-45 ohms j-0. The calculator says I would gain 1db or less by changing coax. My next change would to be to add short radials. I have 30 100 footers now. I have put down a 1/4 wave radial for 20 meters