UK Radio Astronomy Association (UKRAA)

E-Field Active Antenna Amplifier and Bias-T

The active elements of a E-Field antenna, the mast head amplifier and Bias-tee for power injection to the feeder. The user needs to connect a short whip or plate to the amplifier and enclose the assembly in a weather proof enclosure ready for installation.


The completed antenna is a compact alternative to traditional HF antenna designs. The amplifier has a good response from below 20kHz to over 30MHz and is ideal for monitoring both wanted signals and HF band interference.  For the radio astronomer it covers the VLF band and would provide a means of monitoring interference.

There is a very good explanation of the elementary theory and operation underling the e-field probe on by PA3FWM and originally published in Electron magazine

It was originally designed and sold by the late Dave Powis G4HUP and sold under the HupRF name. This kit won the Construction category at the RSGB Construction Competition 2016.

Assembly and testing documentation can be downloaded here E-Field Manual.

A write up by Dave Powis detailing his initial testing and comparison of different mounting methods can be downloaded here E-Field Evaluation and Application Notes.

Price: £ 16.50
Copyright MAXXmarketing GmbH
JoomShopping Download & Support

We use cookies to improve our website and your experience when using it. Cookies used for the essential operation of this site have already been set. To find out more about the cookies we use and how to delete them, see our privacy policy.

  I accept cookies from this site.
EU Cookie Directive plugin by