REF recent discussion about MF antennas
I have 3 antennas to choose from on MF/630M
For TX i use a 1/4 wave inv L, vertical section 32 metres and rest
horizontal.
Next best RX antenna is MF/160M 1/4 wave inv L 26 metres vertical and rest
horizontal again good capture area
Third antenna is a 1 metre magnetic loop and not as good as the above two
antennas because of smaller capture area.
My experience on MF indicates that the larger the antenna the better the
signal because of the large capture area
Smaller antennas do work after a fashion ie loops with suitable rf amps but
some signals I cannot hear or are very weak compared to the larger antennas as
described above
My QTH is out in the countryside well away from local urban noise and no
overhead power lines, all utility services to the property are
underground.
QTH is an important factor when determining suitable antennas.
Conclusion:-
Where possible use the largest antenna for the desired frequency , antennas
with a large capture areas. Small loops, active antennas even with appropriate
amplifiers are no substitute for the full size resonant wire antennas on MF or
LF
Fortunately I have several antennas and can switch amongst them for
received signal comparisons ie sensitivity, signal over noise etc
For TX a 1/4 wave inv L as high as possible with suitable insulated radials
is a good performer also a full size 1 wavelength vertical quad loop, or a full
size dipole inv V
Smaller antennas with loading coils for resonance and matching although
functional are inefficient.
73 de MAL/G3KEV/IO94SH
