----- Original Message -----
Sent: Wednesday, July 25, 2012 1:02
PM
Subject: Re: LF: MF DOPOLE
Am 25.07.2012 10:37, schrieb mal hamilton:
MF
I tried a full size Horizontal dipole up at 12 metres
high for 160 metres some years back and it was NO GOOD for DX long
haul
Maybe not for DX but it would be OK for many
people to cover a range of 1000km! In /p with QRP power levels there is no DX
to be expected anyway.
Will be interesting to see if there are significant
QSB effects compared to a vertical. But this will be very hard to
interprete...
On 160m i used a 130m lazy loop in 8m height and worked
the US in a CW contest, running 600W. The main lobe may show to 90 deg but
anyway something is radiated at low angles.
Transmitting, however it did work well on Receive
I was able to receive East coast USA stations at good
strength both on CW es SSB but they had difficulty or could not hear
me running 400 Watts to the antenna.
When I changed over to a 1/4 wave inv L with a
vertical height of 20 metres I was able to work every one that i could hear
including ZL es VK plus all the W stns as far as W6/7 es VE7
Because the dipole was so low the angle of radiation
was too high and the transmitted RF had fizzled out on long
haul.
Surely the dipole will not as good as a 30m
inv-L. But just for fun, on holidays or fielddays or for those who have no 30m
inv-L (!) it may be an alternative. And it is fascinating :-)
Locally it was probably ok but this was not my
aim.
I have a 25 metre mast available at present and
thought about an inv V dipole for 600 metres as an experiment but it would
be so low at this frequency and exhibit high angle radiation that it would
be useless for long haul but probably very good around
EU
So maybe it would perform even better in EU QSOs,
maybe with lower QSB. How many MF QSOs (not the QSX 7033 kHz stuff) outside a
range of 3000 km have you done?
73,
Stefan/DK7FC
