Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

RF amplifier , testing, conversions and distance for EUT

RF amplifier , testing, conversions and distance for EUT

RF amplifier , testing, conversions and distance for EUT

I think that I got my self confused in the units, and I am kind of new with this so you will have to bear with me....

To rent test equipment in order to perform immunity tests similar to IEC 61000-4-3
(3V/m, 26Mhz to 1GHz, 1kHz sine +/- 80%) to work out any bugs before the device goes for official testing.  

Signal Generator ---> RF Amplifier ---> Antenna

---- my logic/questions --------------
Typically the Generator has a RF output of about 13dBm ( if my conversions are correct this is equivalent to 0.02W or 120dBuV )

Since the EUT test requires a level of 3V/m ( if my conversions are again correct this is equal to 9.5dBv or 129.5dBuV)

How do I calculate what size amplifier I need along with the distance requirement?

My guess is that at the output of the signal generator I could obtain a maximum of 1V...neglecting antenna gain/loss if I were to move 1m away from the signal generator my power would be cut in half or 0.01W which would now have a signal strength of 117dBuV, or 0.71V/m.  Thus if I want a level of 3V/m at say 1m so I would want an output of 6V/m or 135.5dBuV ???

Also if a an RF amplifier says that it will provide 20dB of gain... how do I calculate what the total output power?
is it just 13dBm + 20dB = 33dB ???

If I am a couple of meters away and there is free air propagation, how much free air loss can I expect?

Thanks for your time


RE: RF amplifier , testing, conversions and distance for EUT

Suggestion: Visit
EN 50082-1: "New Approach" generic European standard that provides radiated immunity field levels for electronic apparatus intended for use in residential, commercial, and light industrial environments. Calls out IEC 801-3 as the basic testing document to be used.

EN 50082-2: "New Approach" generic European standard that provides radiated immunity field levels for electronic apparatus intended for use in the heavy industrial environment. Calls out IEC 1000-4-3 as the basic testing document to be used.

etc. for more info

The following equation:
13dBm + 20dB = 33dB ???
has to have the same dimensions on the left side and on the right side.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close