144 MHz EME

My current 2m equipment:

Yaesu FT-847170 W PASequencerPre-amp by Microwave Modules
8 element yagi for 2m
Transceiver Yaesu FT-847170 W PA (RF Concepts)Sequencer with 4 portsPre-amp (Microwave Modules) 8 element yagi (3.8 m boom)

Most of the equipment above will be sufficient for a beginner's EME station, but the weak link is the antenna. The gain of my 8 element yagi (Wimo WY208) is about 11 dBd and this in not enough for EME, except for working a few monster stations. I will focus on increasing the antenna gain. My goal is to build an array with minimum 15 dBd gain. This is what DK3QN Klaus recommends on his excellent EME page.

New 8 element quad 

My new antenna is an 8 element 2 meter quad from GB Antennas in the Nederlands. 

Gain: 13.0 dBd 
Front/back: 25 dB
Front/side: 35 dB
SWR: 1.1 at resonance frequency
SWR max 1.5 (144-146 MHz)
Boom: 30 mm x 30 mm aluminium 
Boom length: 2.35 m
Spreaders: 8 mm fiberglass
Max wind speed: 120 km/h
Weight: 3.5 kg
Power rating: 3 kW PEP
Price: 150 EUR
Scans from user guide: beam patternother data
8 element quad on floor - click to enlarge
Factory data.
8 element quad by GB Antennas.

My new 8 element quad - click picture to enlarge.
The folding ruler on the floor is 1 m long.

Quad assembly hints
The quad is not difficult to assemble, but you will benefit from these hints:
  1. Use the brown tube when fitting the element holders.
  2. The antenna wire is strong and fitting it to the fiberglass spreaders is difficult. Assemble the wire hooks first, before fitting the loop to the spreaders. Use a tool to stretch the wire over the spreader. During my first attempt, I did it the other way around: Firstly I fitted the wire onto the 4 spreaders, and then I would assemble the wire hooks. The wire had strong tension, and one of the hooks slipped. It flew backwards and into my thumb. Aa-uu-www! 
  3. If the wire can't slip over the spreader, you can cut off a piece of the spreader tip.


I am taking a break from EME planning and construction.

I spend my time running JT65A on HF.

I am also building a 1296 MHz transverter.


73 de
OZ1BXM Lars


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Latest change: 18-Sept-2011 by Lars Petersen, OZ1BXM.