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Date: Sat, 08 Mar 2014 16:29:29 +0100
To: rsgb_lf_group@blacksheep.org,rsgb_lf_group@blacksheep.org
From: IK1WVQ Mauro <ik1wvq@stmb.it>
In-Reply-To: <531B2478.70500@iup.uni-heidelberg.de>
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Subject: Re: LF: Microphone via WLAN (WiFi) ?
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Hi Stefan
it is not completely compliant to your requests,=20
but, if you do not find the right equipment, you=20
can consider the "baby monitor" at 860 MHz ..=20
some units are digital, and you can route the=20
sound output to the line input of the sound card of your PC .
In free space, without antennas, you can obtain near 300 meters..
the system is "near" legal (you can consider your=20
new VLF receiver as a "baby" !!! hi!)

73 de Mauro IK1WVQ

At 15.08 08/03/2014, Stefan Sch=E4fer wrote:
>Hi all,
>
>Again i spent some time to find a module which=20
>allows to transfer a mircophone input signal via=20
>WLAN to the PC. Without success...
>
>To make things clear:
>
>The system has to consist of to parts:
>
>1: The first one is battery supplied and has a=20
>microphone input (like a cheap external USB=20
>soundcard) and a WLAN output, using an external=20
>antenna and SMA plug. I.e.: Input: 3.5mm=20
>microphone jack. Output: SMA WLAN antenna connector.
>2: The second part is connected to the PC and is=20
>a WLAN receiver that appears as a normal=20
>external USB soundcard and allows to receive the=20
>audio signal from the first part of the system.
>
>The system allows to run a /p receiver for VLF or any other band.
>
>
>An expert could create such a circuit for=20
>himselfe but i need to buy something like that,=20
>if it is available. But all i can find in the=20
>web is the opposite way, i.e. people who want to=20
>transfer their sound from the PC to a /p=20
>loudspeaker or headphone, argh...  Or, a big=20
>device which includes a real big microphone=20
>(dynamic range ???). These are expensive systems.
>
>However, external soundcards are cheap and WLAN modules are cheap too.
>
>So, isn't there such a device for a few EUR in=20
>the web, these days? It has to have a dynamic=20
>range of  at least 100 dB, like the 2 EUR=20
>external soundcards at amazon do (with some luck).
>
>Any help is much apprechiated :-)
>
>73, Stefan/DK7FC