UK Radio Astronomy Association (UKRAA)

E-Field Active Antenna Masthead Amplifier and Bias-T Kit

This kit provides the active elements of an 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 at by PA3FWM and originally published in Electron magazine

The kit is simple to build and install and provides a good quality active HF antenna suitable for use with SDR receivers. It is also an ideal project to learn and improve your ability to solder SMD components. This kit is suitable for Clubs to use as a training aid for soldering skills and gives course participants a useful new piece of kit after the course.

This kit is now available from the UK Radio Astronomy Association. 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: £ 9.50
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