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Date: Wed, 11 Sep 2013 13:58:53 +0300
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From: phl@netikka.fi
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Subject: Re: LF: Some pictures of the OH1AH lighthouse expedition
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Status: O

Hello Stefan,

Thanks for the nice comments.

The setup could certainly be improved by using more than the 4 radials  
we had. At resonance the feedpoint was 35 ohm. The antenna wire itself  
was about maximum achievable in that location, ie. 10m vertical wire  
with a sloping 25m topload up to 20m AGL. More TX power is of course  
another way to improve EIRP.

But, but - the TX antenna system was already too good for the 60 W TX  
power that could be squeezed out from the JUMA. (Read: 1W EIRP was  
certainly acheived even with a reasonable marigin for environmental  
losses).

Something we have been working desperately on over the past 5 or 6  
years is improving the receive side setup. We have a lot of man-made  
noise both on HF and MF. An untuned inverted-L at the southern  
sea-shore more than 100m away from the lighthouse has been the best  
solution so far, but we still struggle with QSO's on both HF and MF  
where the recieved reports are great while on our side we can hardly  
make out what the other party is trying to say.

Winter operation from the island would be possible, but probably not  
from the lighthouse or even using the lighthouse as an antenna support.

BR

Paul-Henrik, OH1LSQ


Quoting Stefan Sch=E4fer <Stefan.Schaefer@iup.uni-heidelberg.de>:

> Hi Paul-Henrik,
>
> Thanks for the report/photos on OH1AH's setup and location and for  
> the CW activity :-)
> I hope you can further improve the station. Could you try such an  
> activity in winter, maybe between xmas and the new year? :-)
> BTW i like the Finnish language, although i do not understand a  
> single word :-)
>
> 73, Stefan/DK7FC
>
>
>
> Am 10.09.2013 21:37, schrieb phl@netikka.fi:
>> Hello all, LF MF
>>
>> Here is a link to a Finnish MF-minded forum where I have posted  
>> some pictures of our MF station on the Uto (Ut=F6) island expedition  
>> last month.
>>
>> The forum is in finnish but the pictures tell more than 1000 words  
>> as they say. Our MF log is also in the same thread. Scroll down a  
>> bit to get to the pictures/log:
>>
>>
>> http://peditio.net/utility/YaBB.pl?num=3D1376341089
>>
>>
>> Thanks to all reporters and QSO parties. We will try to do this  
>> again next year. As you can see in the ATU pictures, our takeoff to  
>> the Baltic sea and Gulf of Finland could not be better - just blue  
>> water.
>>
>>
>> Paul-Henrik, OH1LSQ
>>
>>
>>