G4TPH Portable Magloop Antenna Assembly Instruction These instructions explain how to set up the G4TPH ML40 mk11 and ML20 mk11 portable antennas. Both antennas consist of a tuning unit, a load unit, a hardware pack and several rails. Model Bands SWR ML-40 MKII 40m –15m 1.2: 1 ML-20 MKII 20m-10m 1.1:1 The ML40 mk11 uses 10 rails The MK20 mk11 uses 7 rails. Each antenna has 2 rails with a blue spot at one end. The blue spot indicates the end of the rail that should be attached to the tune unit (the tune units use M4 bolts and all other rails are drilled to take M6 bolts. The star washers supplied should be fitted between the rails to help the antennas to hold their shape Assemble all rails into a circle with the load unit attached opposite the tune unit (at the bottom) Tuning the G4TPH Mag-Loop To tune the antenna adjust the tuning unit for maximum noise on receive for the middle of the band you wish to work. Key the transmitter and check the SWR. You may find that you will need to make small adjustments at first since your body capacitance will affect the tuning. Unlike most Magnetic loop antennas once the minimum SWR point is found you should be able to work the whole of the band without having to retune with an SWR of 1.5:1 or better. This is one of the major benefits of the G4TPH design. A picture, they say, is worth a thousand words so here are some pictures to help explain the above assembly instructions. Happy portable operating and Gud DX Tom G4TPH mail: [email protected] www.g4tph.com A sample SWR Chart for ML40 mk11, showing SWR across the band, on 15 meters Tune unit with blue spot rails Load unit with BNC cable ML40 mk11 assembled Washer between rails