×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Bird 4030 element

Bird 4030 element

Bird 4030 element

(OP)
Does anyone know if the model 4030 relative field strength element has an internal battery or does it depend solely on the field which it is sniffing?

Equal rights for equal responsibilities.
Equal opportunities for equal abilities.

RE: Bird 4030 element

Since nobody has replied, I will throw in my partial knowledge.

Standard mechanical-meter Bird Wattmeters do not use batteries. The plug-in wattmeter element is a RF detector with diode. The rectified RF output of this element drives the meter.

The Bird wattmeter is based on the principle of a directional coupler, with the transmission line portion of the coupler in the body of the meter, and the coupled element with a detector in the plug-in element. Reversing the element by 180 degrees allows you to measure the forward and reverse - similar to reversing a coupler.

If the wattmeter is subjected to too much RF power for the element plugged-in the diode will get fried. Some amateur radio operators buy damaged elements, drill the rivets, and replace the diodes. Afterwards, the accuracy is suspect, but is more than adequate for hobby use.

RE: Bird 4030 element

(OP)
Thank you Comcokid.  I did know that.  The 4030 is different.  It doesn't use the directional properties of the host meter plus plug-in arangement.

Yes VE1BLL, I too found that link.

Thank you both once again.

Equal rights for equal responsibilities.
Equal opportunities for equal abilities.

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!


Resources