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From: John Rabson <john.rabson@numeo.fr>
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Date: Tue, 4 Jan 2011 10:25:34 +0100
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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 Stefan, Wolf , LF,

I have a  diesel Renault Kangaroo [no - KANGOO - obviously an Australian=
 designed this dictation software].  I have found it impossible to make we=
ak-signal field strength measurements on 136 from the vehicle.=20

There appears to be some kind of data bus to communicate between a central=
 control unit and sensors which indicate (for example) whether the doors=
 are open or closed.  Something seems to be running even when the engine=
 is switched off. My solution is going to be a portable receiver and anten=
na which can be carried a few metres away from the car, otherwise I cannot=
 measure field strengths with any usefulness at a distance of more than ab=
out 2 km from the transmitter.

There is even a problem on some longwave broadcast stations.

73 John F5VLF

On 30 Dec 2010, at 16:34CET, Stefan Sch=E4fer wrote:

> Hello Wolf,
>=20
> Nice email ;-)
> Well, no it is a benzine car, an almost 22 years old VW Golf II !! ;-)=
 You could know it from the VLF pictures, HI :-) So there is no internal=
 electric bus! And i have a car radio (ALDI!) that receives on VHF/MF/LF=
 and i do not have QRM by the ignition coil! Once i made holidays at the=
 Nordsee (JO33) i drove with the car and listened to DLF/153 kHz during th=
e whole tour without problems. Only HV transmission lines above 110 kV cau=
se QRM.
>=20
> So maybe i have a little better situation to receive DF6NM on LF /m. Oth=
erwise i have to drive on the highway, lets say 180 km/h (the maximum of=
 this car) and have to switch off the engine during Markus' transmission=
 that must be short then until i have to accelerate again at 90 km/h :-)).=
 If this will not work i have to drive to a highway near N=FCrnberg :-)
>=20
> The magnet foot antenna is already ordered and i am curious about the re=
sults ;-) Mostly i need it for receiving LF during the VLF experiments, e.=
g. to the xband QSO 9/137 with DF6NM, and maybe DF0WD? :-)
>=20
> 73, Stefan
>=20
> Am 30.12.2010 12:03, schrieb wolf_dl4yhf:
>> Hi Stefan,
>>=20
>>=20
>> 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 ans=
wering on 30m while beeing on the highway :-)
>>=20
>>=20
>> Maybe, it's a Diesel engine, and the alternator properly low-pass filte=
red. I tried this years ago, and the QRM from the ignition coil, and / or=
 the alternator was horrible. No big surprise that car radios with AM LF=
 broadcast receivers have disappeared. And weak-signal reception "LF mobil=
e" is even more a challenge.
>>=20
>> In my Corolla, I would even have to disconnect the battery (!) if I was=
 to receive VLF (and, most likely,  LF too) because some internal digital=
 bus (most likely CAN or LIN) remains active, with the ignition and everyt=
hing else turned off. For temporary V(!)LF operation on a remote site, I=
 use a simple FM oscillator at the transmitter now, and listen to the VLF=
 signals in the car's radio, using a distance of 10 m or so.
>>=20
>>=20
>> Cheers and a happy new year,
>>   Wolf DL4YHF .
>>=20
>=20
>=20