Measuring RF Voltage at Antenna Ground Contact

In summary, the conversation discusses an RF burn issue that may be caused by the grounding connection being too long or too short for the frequency being radiated. The person is looking for a way to measure the E-field voltage when touching the metal without grounding, in order to support their theory. It is noted that it is difficult to get a low resistance connection to ground and that an RF probe may be useful in this situation.
  • #1
spid3rx
15
0
Hello all,

I encounter some RF burn issue on the metal contact between an antenna with the grounding. The metal is actually connecting to the ground. I suspect that it could be due to the grounding effect which may be too long or too short for that frequency that is radiating. Because of that, the RF burn might be due to loading and cause high voltage/high E-field at the point when our finger touch the metal.
Is there any kind of RF probe can measure the E-field voltage when touching and without? I need proof and evidence to support my own theory.

thanks,
spid3rx
 
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  • #2
It depends on what the ground connection was. It is very difficult to get a low resistance connection to ground.
Even large radio transmitter antennas have to use huge ground mats of copper wire to get a reasonable ground.
So, with simple setups, some resistance to ground is always present.

It is possible that you were picking up RF with your body being close to the radiating part of the antenna and getting an RF burn when you grounded part of your body.

Here is an RF probe, but it requires a return path to something which is normally ground.
Just the connection to the oscilloscope ground might be OK.

[PLAIN]http://dl.dropbox.com/u/4222062/RF%20probe.PNG [Broken]
 
Last edited by a moderator:

1. How is RF voltage measured at antenna ground contact?

RF voltage at antenna ground contact is typically measured using a voltmeter or oscilloscope. The voltmeter is connected to the ground terminal of the antenna and the ground terminal of the measurement device. The oscilloscope is connected in parallel with the antenna ground lead. Both devices provide a reading of the voltage at the antenna ground contact.

2. Why is it important to measure RF voltage at antenna ground contact?

Measuring RF voltage at antenna ground contact is important because it can provide valuable information about the performance and safety of the antenna system. High RF voltage levels can indicate potential problems with the antenna or its grounding, which can affect the overall performance and safety of the system.

3. What factors can affect the accuracy of RF voltage measurements at antenna ground contact?

Several factors can affect the accuracy of RF voltage measurements at antenna ground contact, including the quality of the measurement device, the type and condition of the antenna, and the surrounding environment. It is important to ensure that the measurement device is properly calibrated and that there are no external factors that could interfere with the measurement.

4. How can RF voltage at antenna ground contact be minimized?

There are several ways to minimize RF voltage at antenna ground contact. One method is to ensure that the antenna is properly designed and installed, with a sufficient number of grounding points. Additionally, using high-quality coaxial cables and connectors can help reduce RF voltage. Properly grounding the antenna and using surge protectors can also help minimize RF voltage levels.

5. Can RF voltage at antenna ground contact be dangerous?

Yes, high levels of RF voltage at antenna ground contact can be dangerous. It is important to always follow safety guidelines and best practices when working with antennas and RF equipment. If you are unsure about the safety of your antenna system, it is best to consult a professional or experienced individual for guidance.

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