Message-ID: <4D1CA675.5070706@iup.uni-heidelberg.de>
Date: Thu, 30 Dec 2010 16:34:13 +0100
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: LF "Mobile" ( was :  "NM" on 136177 )
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Hello Wolf,

Nice email ;-)
Well, no it is a benzine car, an almost 22 years old VW Golf II !! ;-)=20
You could know it from the VLF pictures, HI :-) So there is no internal=20
electric bus! And i have a car radio (ALDI!) that receives on VHF/MF/LF=20
and i do not have QRM by the ignition coil! Once i made holidays at the=20
Nordsee (JO33) i drove with the car and listened to DLF/153 kHz during=20
the whole tour without problems. Only HV transmission lines above 110 kV=
=20
cause QRM.

So maybe i have a little better situation to receive DF6NM on LF /m.=20
Otherwise i have to drive on the highway, lets say 180 km/h (the maximum=
=20
of this car) and have to switch off the engine during Markus'=20
transmission that must be short then until i have to accelerate again at=
=20
90 km/h :-)). If this will not work i have to drive to a highway near=20
N=FCrnberg :-)

The magnet foot antenna is already ordered and i am curious about the=20
results ;-) Mostly i need it for receiving LF during the VLF=20
experiments, e.g. to the xband QSO 9/137 with DF6NM, and maybe DF0WD? :-)

73, Stefan

Am 30.12.2010 12:03, schrieb wolf_dl4yhf:
> Hi Stefan,
>
>
> you wrote:
> > This should allow me to easily receive 137 kHz while driving the car!
> > Hopefully there is not to much QRM during engine is running.
> > So maybe i can try a crossband QSO with DF6NM TXing on 137 and me=20
> answering on 30m while beeing on the highway :-)
>
>
> Maybe, it's a Diesel engine, and the alternator properly low-pass=20
> filtered. I tried this years ago, and the QRM from the ignition coil,=20
> and / or the alternator was horrible. No big surprise that car radios=20
> with AM LF broadcast receivers have disappeared. And weak-signal=20
> reception "LF mobile" is even more a challenge.
>
> In my Corolla, I would even have to disconnect the battery (!) if I=20
> was to receive VLF (and, most likely,  LF too) because some internal=20
> digital bus (most likely CAN or LIN) remains active, with the ignition=
=20
> and everything else turned off. For temporary V(!)LF operation on a=20
> remote site, I use a simple FM oscillator at the transmitter now, and=20
> listen to the VLF signals in the car's radio, using a distance of 10 m=
=20
> or so.
>
>
> Cheers and a happy new year,
>    Wolf DL4YHF .
>