From owner-freebsd-isp Thu Oct 30 15:00:32 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id PAA18230 for isp-outgoing; Thu, 30 Oct 1997 15:00:32 -0800 (PST) (envelope-from owner-freebsd-isp) Received: from hq.seicom.net (mail.seicom.net [194.97.200.30]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id PAA18220 for ; Thu, 30 Oct 1997 15:00:29 -0800 (PST) (envelope-from udesign!lukas@hq.seicom.net) Received: from udesign.UUCP by hq.seicom.net (8.8.5/8.8.3) with UUCP id AAA02692; Fri, 31 Oct 1997 00:05:59 +0100 (CET) Received: by reactor.design.de id m0xR3aN-000BijC (Debian Smail-3.2 1996-Jul-4 #2); Fri, 31 Oct 1997 00:01:07 +0100 (MET) Message-Id: From: lukas@design.de (Lukas Wunner) Subject: Re: Wireless Services In-Reply-To: from Andrew Webster at "Oct 30, 97 05:08:34 pm" To: andrew@pubnix.net Date: Fri, 31 Oct 1997 00:01:07 +0100 (MET) Cc: kbrown@primelink.com, tomthai@future.net, dnelson@slip.net, rgrimes@GndRsh.aac.dev.com, bad@uhf.wireless.net, danny@panda.hilink.com.au, freebsd-isp@FreeBSD.ORG X-Mailer: ELM [version 2.4ME+ PL31 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-isp@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi, > Excuse the interruption in your conversation. Actually at 2.4Ghz, you are > nearing the excitation frequency of water (2.5Ghz if your average > Microwave oven), you may see quite a bit of signal attenuation if there is > snow/rain. Exactly. The weather can have a considerable influence on the signal quality: - transmission quality is higher in winter (air seems to be clearer?) - if there's a lightning somewhere in the vicinity, transmission will stop completely for a few seconds > Of course if your transmitter is powerful enough, you can just punch a > hole in the weather. Here in Germany (or rather, in all ETSI countries), the EIRP regulations are very strict, so even with the 18 dBi antennas, you cannot go further than about 2.5 km. According to a guy from BreezeCom, in China there are no regulations whatsoever wrt transmission power, so these guys are more or less roasting the birds on their antennas. IIRC, the guy spoke of 60W. The US version has 1W if I am not mistaken. Lukas, proud owner of a BreezeCom system w/ those crispy 18 dBi antennas. :-) -- lukas wunner unix, internetworking and security engineer lukas@wunner.de LW26-RIPE http://www.wunner.de/~lukas/ Funkmodems mit 2.4GHz FAQ http://www.wunner.de/~lukas/funk/