G4TPH Portable Magloop Antenna Assembly Instruction mk11 portable antennas.

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