Hi all,
Thanks for all the comments and ideas.
Well, the low power consumption is essential. I would have no problem to
exchange an accumulator each 2 weeks but not 2 times a day ;-) Also the
described systems appear to complex to me (and to other users).
At home i have a standard USB WLAN adapter and i can measure the power
consumtion tomorrow but i guess it is less than 50 mA. Also, if possible
i would like to avoid using additional software like VLC and so on. I
need the PC for several SpecLab instances and a few VAC instances. It
would become complex then...
What about that WLAN camera? It consists out of two parts, ok, but the
/p part is very compact, has a WLAN output and a microphone. This
appears to be very close to what i'm searching. So it cannot be a
miracle or utopic. See
http://www.amazon.de/Kamera-%C3%9Cberwachungskamera-Empf%C3%A4nger-Zubeh%C3%B6r-Wireless/dp/B004AZL6AE/ref=pd_cp_ce_2
OK, it needs to be connected to the soundcard by hardware but maybe that
is even better or more flexible, at least it is not to much effort and
does not consume additional CPU load...
Any other ideas? Would you think it is worth a try, i.e. to buy it?
73, Stefan/DK7FC
Am 09.03.2014 00:47, schrieb Tobias DG3LV:
Hi Stefan !
10 mA at 5 Volts will not be enough. You may get analog(!) audio
transmission sets for 2G4 or 5G8, but they do not use WLAN.
As Wolf has stated, there will be a lot of software involved in all of
such a system you want to use.
Maybe this could work w/o software development:
Transmitter site using a RaspberryPi equipped with ext. Soundcard and
WLAN. Software "VLC"/Linux for "audio streaming"(Server).
Receiver site using standard (WLAN-)Windows PC and software
"VLC"/Windows for streaming client.
Setup both VLC's to uncompressed audio. That should deliver 16 Bit
Stereo audio (max. 96dB SNR) at 44.1 or 48 kS/sec.
A RaspberryPi consumes abt. 3 Watt + soundcard + WLAN. Would that fit
your requirements ?
73 de dg3lv tobias
Am 08.03.2014 15:08, schrieb Stefan Schäfer:
Hi all,
Again i spent some time to find a module which allows to transfer a
mircophone input signal via 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 microphone input (like a
cheap external USB soundcard) and a WLAN output, using an external
antenna and SMA plug. I.e.: Input: 3.5mm microphone jack. Output: SMA
WLAN antenna connector.
2: The second part is connected to the PC and is a WLAN receiver that
appears as a normal external USB soundcard and allows to receive the
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 himselfe but i need to buy
something like that, if it is available. But all i can find in the web
is the opposite way, i.e. people who want to transfer their sound from
the PC to a /p loudspeaker or headphone, argh... Or, a big device which
includes a real big microphone (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 the web, these days? It
has to have a dynamic range of at least 100 dB, like the 2 EUR external
soundcards at amazon do (with some luck).
Any help is much apprechiated :-)
73, Stefan/DK7FC
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