Message-ID: <500FEE4B.5030401@iup.uni-heidelberg.de>
Date: Wed, 25 Jul 2012 15:02:03 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: MF DOPOLE
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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

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Am 25.07.2012 10:37, schrieb mal hamilton:
<blockquote cite="mid:003001cd6a40$a9199650$0401a8c0@xphd97xgq27nyf"
 type="cite">
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  <div><font face="Arial">MF</font></div>
  <div><font face="Arial">I tried a full size Horizontal dipole up at
12 metres high for 160 metres some years back and it was NO GOOD for DX
long haul</font></div>
</blockquote>
<br>
Maybe not for DX but it would be OK for many people to cover a range of
1000km! In /p with QRP power levels there is no DX to be expected
anyway. <br>
Will be interesting to see if there are significant QSB effects
compared to a vertical. But this will be very hard to interprete...<br>
<br>
On 160m i used a 130m lazy loop in 8m height and worked the US in a CW
contest, running 600W. The main lobe may show to 90 deg but anyway
something is radiated at low angles.<br>
<br>
<blockquote cite="mid:003001cd6a40$a9199650$0401a8c0@xphd97xgq27nyf"
 type="cite">
  <div><font face="Arial">Transmitting, however it did work well on
Receive </font></div>
  <div><font face="Arial">I was able to receive East coast USA stations
at good strength both on CW es SSB but they had difficulty or could not
hear me&nbsp;&nbsp;running 400 Watts to the antenna.</font></div>
  <div><font face="Arial">When I changed over to a 1/4 wave inv L with
a vertical height of 20 metres I was able to work every one that i
could hear including ZL es VK plus all the W stns as far as W6/7 es VE7</font></div>
  <div><font face="Arial">Because the dipole was so low the angle of
radiation was too high and the transmitted RF had fizzled out on long
haul.</font></div>
</blockquote>
Surely the dipole will not as good as a 30m inv-L. But just for fun, on
holidays or fielddays or for those who have no 30m inv-L (!) it may be
an alternative. And it is fascinating :-)<br>
<br>
<blockquote cite="mid:003001cd6a40$a9199650$0401a8c0@xphd97xgq27nyf"
 type="cite">
  <div><font face="Arial">Locally it was probably ok but this was not
my aim.</font></div>
  <div><font face="Arial">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</font></div>
</blockquote>
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?<br>
<br>
73, Stefan/DK7FC<br>
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