Message-ID: <4E9A2EC4.20303@iup.uni-heidelberg.de>
Date: Sun, 16 Oct 2011 03:09:24 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <4E997F3C.8090707@gmail.com> <4E99E4EC.9000004@iup.uni-heidelberg.de> <4E9A250B.4050609@gmail.com>
In-Reply-To: <4E9A250B.4050609@gmail.com>
Subject: Re: LF: 136.172 khz 15oct11
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
X-AOL-SCOLL-URL_COUNT: 0  
x-aol-sid: 3039ac1d60164e9a2f231b62
X-AOL-IP: 195.171.43.25
X-AOL-SPF: domain : blacksheep.org SPF : none


Hi Dex,

Am 16.10.2011 02:27, schrieb Dexter McIntyre W4DEX:
> I consider myself to have a good basic understanding of electronics=20
> and RF but have to depend on people like you to do the design work.
Oh, and i learned a lot from DF6NM or ON7YD (LF pages) or M0BMU or DJ1ZB=20
or G4JNT or DL4YHF.... We are all learning from each other. A good group!

>   The people on this and other radio groups have helped me=20
> tremendously.  If I were forced to name a few it would be W1TAG and W1V=
D.
>
>
>> And BTW what is your RX system you use on LF?
>
> Recently I've been using an Icom R-75 receiver with no added options. =20
> I was considering either adding the high stability oscillator or=20
> locking it to an external timebase.  But the receiver has been so=20
> drift free I see no advantage in improving it.  I also have a HP-3586B=20
> and a W/G SPM-19.  For weak signal LF reception all perform the same.
>
> Presently I'm down to two LF antennas for receive.  The tuned transmit=20
> antenna and a vertical wire of about 20 meter length over a tree=20
> limb.  This wire is located close to 200 meters from my house in a=20
> wooded area.  The wire is connected to a ground rod through a high to=20
> low impedance transformer.  75 ohm coax brings it to the house where=20
> the coax is isolated with a 1:1 transformer.  Seldom can I see any=20
> difference between these two antennas for LF reception.  A PA=D8RDT=20
> mini-whip works great for portable use but I can't easily get it above=20
> the large oak trees surrounding my house.
Tnx for description. You all seem to have a good location for a RX=20
antenna. Here i am 35m above ground and there are almost no trees but=20
100s of PCs running that building, with their Y caps within the SMPS on=20
the protection earth wire that is unfortunately connected to the=20
lightning arrester wire at some places. Thus i have to go /p for CW DX=20
and think about a link to a forest antenna for the grabber...

> I'm looking forward to seeing a signal from that new coil!
Me too :-) The wire is alredy in the post and will arrive here on=20
tuesday i think. Will take just some few days then ;-)

73, Stefan/DK7FC