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Re: LF: LF "Mobile" ( was : "NM" on 136177 )

To: [email protected]
Subject: Re: LF: LF "Mobile" ( was : "NM" on 136177 )
From: Stefan Schäfer <[email protected]>
Date: Thu, 30 Dec 2010 16:34:13 +0100
In-reply-to: <[email protected]>
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Hello Wolf,

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 the whole tour without problems. Only HV transmission lines above 110 kV cause QRM.

So maybe i have a little better situation to receive DF6NM on LF /m. Otherwise 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 Nürnberg :-)

The magnet foot antenna is already ordered and i am curious about the results ;-) Mostly i need it for receiving LF during the VLF 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 answering on 30m while beeing on the highway :-)


Maybe, it's a Diesel engine, and the alternator properly low-pass filtered. 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 mobile" is even more a challenge.

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 everything 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.


Cheers and a happy new year,
   Wolf DL4YHF .


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