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[195.171.43.25]) by mx.google.com with ESMTP id z9si8184301wjz.25.2014.03.08.14.06.47 for ; Sat, 08 Mar 2014 14:06:47 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WMOk3-0007yy-7K for rs_out_1@blacksheep.org; Sat, 08 Mar 2014 21:25:11 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WMOk2-0007yp-NJ for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2014 21:25:10 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.82) (envelope-from ) id 1WMOk0-00078z-Io for rsgb_lf_group@blacksheep.org; Sat, 08 Mar 2014 21:25:09 +0000 Received: from crusoe.iup.uni-heidelberg.de (crusoe.iup.uni-heidelberg.de [129.206.22.248]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id s28LP6vX012335 for ; Sat, 8 Mar 2014 22:25:06 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by crusoe.iup.uni-heidelberg.de (Postfix) with ESMTP id 07362E0E2F for ; Sat, 8 Mar 2014 22:25:05 +0100 (CET) Message-ID: <531B8AB1.5040700@iup.uni-heidelberg.de> Date: Sat, 08 Mar 2014 22:25:05 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <2662DF5AA7FA416CBB09CDB90BBFF7B1@White> <016101cf39df$4f4c89a0$ede59ce0$@comcast.net> <01dc01cf3a3f$86997bb0$93cc7310$@comcast.net> <2FC5CAB271A6437CB35A5B100185CEDA@White> <025101cf3a52$e0925750$a1b705f0$@comcast.net> <7DB9DD5669FC4C648838510DCAC08AFB@White> <531A506E.9040103@abelian.org> <531A5C19.9060209@abelian.org> <02ba01cf3aa3$debaad50$9c3007f0$@comcast.net> <531AF126.2060600@abelian.org> <850A470A5B9F4483BED8B49D4791044A@White> <531B1D0C.3070208@abelian.org> <531B2478.70500@iup.uni-heidelberg.de> <531B796A.9000906@iup.uni-heidelberg.de> <6F39BC7EB5674C358E3C3AFFE8B7892D@White> In-Reply-To: <6F39BC7EB5674C358E3C3AFFE8B7892D@White> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Markus, Am 08.03.2014 21:49, schrieb Markus Vester: > Hi Stefan, > that one looks like an analog video system, 2.4 GHz FM, with a > dedicated receiver box. I once owned a similar set and attempted to > transfer 137 kHz directly through the video channel, without a mixer. > But with the strong in-band utility stations, the dynamic range seemed > too poor. How many dBs? [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: f7f918e40888a44a70dddae14bd6a529 Subject: Re: LF: Microphone via WLAN (WiFi) ? Content-Type: multipart/alternative; boundary="------------000309080003020201020900" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false This is a multi-part message in MIME format. --------------000309080003020201020900 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Hi Markus, Am 08.03.2014 21:49, schrieb Markus Vester: > Hi Stefan, > that one looks like an analog video system, 2.4 GHz FM, with a > dedicated receiver box. I once owned a similar set and attempted to > transfer 137 kHz directly through the video channel, without a mixer. > But with the strong in-band utility stations, the dynamic range seemed > too poor. How many dBs? > On the other hand I'm not sure whether WLAN / WiFi standard would be > the best choice either when looking for low battery drain. What could be the alternative? It must not be a big project with special parts, a project for experts. Ideally part 2 of the system, described in my initial mail, should appear as a normal external USB soundcard to the PC. But generally you know what i mean or thinking about? There are cheap soundcards with 100 dB dynamic range, with some luck even 120 dB (in 1 Hz). They all run at USB, i.e. 5V, maybe even 3.3V is OK for the chip. And also the WLAN chips, running at 5V, consuming just a few 10 mW. I also saw cheap high gain WLAN directional antennas at amazon... I'm considering to start a request to the DARC, maybe DH5FFL, you know him? He will at least know who's the man for such a project! Maybe DF1TY, you know, from the CQDL ;-) 73, Stefan > 73, > Markus (DF6NM) > > *From:* Stefan Schäfer > *Sent:* Saturday, March 08, 2014 9:11 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: Microphone via WLAN (WiFi) ? > > ... > But now i found this: > http://www.amazon.de/Kamera-%C3%9Cberwachungskamera-Empf%C3%A4nger-Zubeh%C3%B6r-Wireless/dp/B004AZL6AE/ref=pd_cp_ce_2 > > ... --------------000309080003020201020900 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Markus,

Am 08.03.2014 21:49, schrieb Markus Vester:
Hi Stefan,
 
that one looks like an analog video system, 2.4 GHz FM, with a dedicated receiver box. I once owned a similar set and attempted to transfer 137 kHz directly through the video channel, without a mixer. But with the strong in-band utility stations, the dynamic range seemed too poor.
How many dBs?

 
On the other hand I'm not sure whether WLAN / WiFi standard would be the best choice either when looking for low battery drain.
What could be the alternative? It must not be a big project with special parts, a project for experts. Ideally part 2 of the system, described in my initial mail, should appear as a normal external USB soundcard to the PC.

But generally you know what i mean or thinking about?

There are cheap soundcards with 100 dB dynamic range, with some luck even 120 dB (in 1 Hz). They all run at USB, i.e. 5V, maybe even 3.3V is OK for the chip. And also the WLAN chips, running at 5V, consuming just a few 10 mW. I also saw cheap high gain WLAN directional antennas at amazon...

I'm considering to start a request to the DARC, maybe DH5FFL, you know him? He will at least know who's the man for such a project! Maybe DF1TY, you know, from the CQDL ;-)

73, Stefan

 
73,
Markus (DF6NM)

Sent: Saturday, March 08, 2014 9:11 PM
Subject: Re: LF: Microphone via WLAN (WiFi) ?

...
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