Message-ID: <18B7C051F44644028448F4FB4779A542@mal>
From: <g3kevmal@talktalk.net>
To: "rsgb" <rsgb_lf_group@blacksheep.org>, <rsgb_lf_group@yahoogroups.co.uk>
Date: Mon, 11 Jun 2018 17:04:31 +0100
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Subject: LF: MF/630M ANTENNAS
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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=20

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.=20

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=20
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=20
Smaller antennas with loading coils for resonance and matching although =
functional are inefficient.


73 de MAL/G3KEV/IO94SH

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<HTML><HEAD></HEAD>
<BODY dir=3Dltr>
<DIV dir=3Dltr>
<DIV style=3D"FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>REF recent discussion about MF antennas</DIV>
<DIV>I have 3 antennas to choose from on MF/630M</DIV>
<DIV>&nbsp;</DIV>
<DIV>For TX i use a 1/4 wave inv L, vertical section 32 metres and rest=20
horizontal.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Next best RX antenna is MF/160M 1/4 wave inv L 26 metres vertical =
and rest=20
horizontal again good capture area</DIV>
<DIV>&nbsp;</DIV>
<DIV>Third antenna is a 1 metre magnetic loop and not as good as the =
above two=20
antennas because of smaller capture area.</DIV>
<DIV>&nbsp;</DIV>
<DIV>My experience on MF indicates that the larger the antenna the =
better the=20
signal because of the large capture area </DIV>
<DIV>&nbsp;</DIV>
<DIV>Smaller antennas do work after a fashion ie loops with suitable rf =
amps but=20
some signals I cannot hear or are very weak compared to the larger =
antennas as=20
described above</DIV>
<DIV>&nbsp;</DIV>
<DIV>My QTH is out in the countryside well away from local urban noise =
and no=20
overhead power lines, all utility services to the property are=20
underground.</DIV>
<DIV>&nbsp;</DIV>
<DIV>QTH is an important factor when determining suitable antennas. =
</DIV>
<DIV>&nbsp;</DIV>
<DIV>Conclusion:-</DIV>
<DIV>&nbsp;</DIV>
<DIV>Where possible use the largest antenna for the desired frequency , =
antennas=20
with a large capture areas. Small loops, active antennas even with =
appropriate=20
amplifiers are no substitute for the full size resonant wire antennas on =
MF or=20
LF</DIV>
<DIV>&nbsp;</DIV>
<DIV>Fortunately I have several antennas and can switch amongst them for =

received signal comparisons ie sensitivity, signal over noise etc </DIV>
<DIV>For TX a 1/4 wave inv L as high as possible with suitable insulated =
radials=20
is a good performer also a full size 1 wavelength vertical quad loop, or =
a full=20
size dipole inv V </DIV>
<DIV>Smaller antennas with loading coils for resonance and matching =
although=20
functional are inefficient.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>73 de MAL/G3KEV/IO94SH</DIV>
<DIV>&nbsp;</DIV></DIV></DIV></BODY></HTML>

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