From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f181.google.com (mail-wi0-f181.google.com [209.85.212.181]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id 96A3420036C for ; Sat, 17 Mar 2012 13:55:09 -0700 (PDT) Received: by wibhr17 with SMTP id hr17so2052507wib.10 for ; Sat, 17 Mar 2012 13:55:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=Ylj1VFBuqj5ko+J92dqPevIAhuch1+V2XNwDcE7ntws=; b=0OjpZzEi0KijSUM3ZfavaeC6b03y9ADVITTcoCgkRfNXhuwqoJuP3bhygUgmZZUpZZ 3phxLTbp32Kr7R+6iJdE221iVtcuZKz7KeN9jLUsteKYJWAS2+i8Ud23i6ALl8r5ouN9 HnxS4X1oU/OjqlihzmYyuD21DXt3htqgf49KsugNXbt+eboSVCRR39DYKRbPoiZM4tOz bBMnsKVooebmG3p46ebP9xRxznRNei9EFhtHYDSowlRRBDCBJMX+5yvtLz+EK6QoPFf0 qmkKQXSeLLhAmHmnxmo/kuPjX55MsdVVHjSacR4l9FuaBAMM5ZFz4Z6audtvykqEb4CB 4aRA== MIME-Version: 1.0 Received: by 10.180.96.228 with SMTP id dv4mr7666020wib.14.1332008438327; Sat, 17 Mar 2012 11:20:38 -0700 (PDT) Received: by 10.223.151.8 with HTTP; Sat, 17 Mar 2012 11:20:38 -0700 (PDT) Date: Sat, 17 Mar 2012 11:20:38 -0700 Message-ID: From: Dave Taht To: thumbgps-devel@lists.bufferbloat.net Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Subject: [Thumbgps-devel] antennas and such X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2012 20:55:10 -0000 I'm fully aware that adding an external antenna can blow the costs out the window. However, getting a gps receiver with integral antenna to a window is something of a problem. So far as I know 5 meters is the outer limit without active regeneration of the signal. http://reviews.ebay.com/USB-Cable-Length-Limitations-and-how-to-break-them?= ugid=3D10000000001067998 I have no idea how usb 'active regeneration' works or if it can affect late= ncy. So moving onto the antenna problem, I note that the length of a patch antenna has a direct relationship as to the quality of it's signal, so this is a determining factor as to the overall size of the dongle. (this is a most-excellent manual, and has details that apply to all gps des= igns) http://www.u-blox.com/images/downloads/Product_Docs/LEA-6_NEO-6_MAX-6_Hardw= areIntegrationManual_%28GPS.G6-HW-09007%29.pdf There are also outboard antennas with varying features (like the ability to be mounted oddly) and active antenna designs. I don't know enough about the active antenna designs to know if they can be powered by a usb source. --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 http://www.bufferbloat.net