Like I have said in the past several times I am surprised how many LF/MF
operators have loops strung from tree branches and in amongst trees and
claim they are perfect, especially those in the USA.
Most of the rf is being absorbed by the trees, perhaps a little escapes.
Compared to loops little and large sited out in the clear they are poor
performers at LF/MF
Serious LF/MF operators should look for a QTH out in the clear avoiding
serious obstacles like trees and close in buildings. Why struggle to
reinvent the wheel when one has options like CABLE, MOBILE PHONES AND THE
INTERNET to surf and chase LL DX.
g3kev
----- Original Message -----
From: "Mike Underhill" <[email protected]>
To: <[email protected]>
Sent: Thursday, August 20, 2009 11:44 AM
Subject: LF: Re: Tree noise
Dennis (DL6NVC)
Please could you try your loop away from the tree. Preferably more than 2
metres. I have found severe bio-electric(?) noise from trees from 3.5 to
500MHz.using loops, whips and UHF Yagis. The noise drops to almost zero
if
the tree ambient temperature is below about zero Celsius.
Mike - G3LHZ
----- Original Message -----
From: "Dennis" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 19, 2009 2:03 PM
Subject: LF: Re: 500kHz qrg range* THANKS!
2. Most of the time there is a terrible broadband noise present in my
home location, which blocks everything below 14MHz and even degrades
Polskie Radio I on 225kHz and BBC4 198kHz (with the rx loop outside the
house in a tree). That's the reason why I did not report any reception
on
500kHz in the last weeks. There simply wasn't anything to receive...
Although in a few kHz bandwidth this broadband noise of course does not
equal the fieldstrengh of a local broadcast station, the broader the
filter, the higher the level, unneccesary loading the mixer.
vy73
Dennis
DL6NVC
--
Neu: GMX Doppel-FLAT mit Internet-Flatrate + Telefon-Flatrate
für nur 19,99 Euro/mtl.!* http://portal.gmx.net/de/go/dsl02
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