From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ccr.org (static-96-255-157-131.washdc.fios.verizon.net [96.255.157.131]) by huchra.bufferbloat.net (Postfix) with ESMTP id ED40B21F53F for ; Sat, 20 Dec 2014 12:57:58 -0800 (PST) Received: by ccr.org (Postfix, from userid 1001) id 2C4BB119C52; Sat, 20 Dec 2014 15:57:56 -0500 (EST) Received: from ccr.org (localhost [127.0.0.1]) by ccr.org (Postfix) with ESMTP id 25537119C19 for ; Sat, 20 Dec 2014 15:57:56 -0500 (EST) To: cerowrt-devel@lists.bufferbloat.net In-reply-to: References: Comments: In-reply-to cerowrt-devel-request@lists.bufferbloat.net message dated "Thu, 18 Dec 2014 12:00:02 -0800." X-Mailer: MH-E 8.4; nmh 1.2; GNU Emacs 24.2.1 Date: Sat, 20 Dec 2014 15:57:55 -0500 Message-ID: <6764.1419109075@ccr.org> From: Mike O'Dell Subject: Re: [Cerowrt-devel] Cerowrt-devel Digest, Vol 37, Issue 24 X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 20 Dec 2014 20:58:27 -0000 15.9bps/Hz is unlikely to be using simple phase encoding that sounds more like 64QAM with FEC. given the chips available these days for DTV, DBS, and even LTE, that kind of processing is available off-the-shelf (relatively speaking - compared to writing your own DSP code). keep in mind that the reason the 2.4 and 5.8 ISM bands are where they are is specifically because of the ready absorption of RF at those frequencies. the propagation is *intended* to be problematic. that said, with good-enough antennas mounted with sufficient stability and sufficient power on the TX end and a good enough noise floor on the RX end, one can push a bunch of bits pretty far. Bdale Garbee (of Debian fame) had a 10GHz bent-pipe repeater up on the mountain above Colo Spgs for quite some time. X-band Gunnplexers were not hard to come by and retune for the 10GHz ham band. i believe he just FM'ed the Gunnplexer with the output of a 10Mbps ethernet chip and ran essentially pure Aloha. X-band dishes are relatively small and with just a few stations in the area he had fun. -mo