Xref: utzoo comp.sys.tandy:2987 sci.electronics:18025 Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!bloom-beacon!deccrl!news.crl.dec.com!shlump.nac.dec.com!snoc01.enet.dec.com!cameronjames From: cameronjames@snoc01.enet.dec.com (James Cameron) Newsgroups: comp.sys.tandy,sci.electronics Subject: Modem to Modem minus telephone network Message-ID: <1991Feb26.094452@snoc01.enet.dec.com> Date: 25 Feb 91 23:01:44 GMT Sender: newsdaemon@shlump.nac.dec.com Reply-To: cameronjames@snoc01.enet.dec.com (James Cameron) Followup-To: comp.sys.tandy Organization: Digital Equipment Corporation (Australia) Lines: 28 For a charity canoe race checkpoint, I want to connect two Tandy 102 laptops over a distance of around 500 metres, with the least wiring possible. The machines have integral direct-connect Bell type modems as well as an RS-232 connector. [fyi; the Bell modems are otherwise useless in Australia] My options appear to be 1) RS-232 cabling (two core plus shield earth), 2) Standard telephone cabling (two core, twisted pair), 3) Field telephone cabling (one core, with earth return), 4) Radio-modems. I want to avoid option 1 due to the high cable cost and the risk of damage due to electrical storm activity and other forms of induced EMF. Option 4 looks a little complicated unless I can find prebuilt radio modems that I can just plug in and run. So down to options 2 and 3... I guess for these I'd use a telephone power supply, but I don't know how to build one nor how it is connected. Can anyone help me with this? How would I achieve single core operation? I've seen the recent discussions in sci.electronics about FM transmitter chips for radio modems, but does anyone have any information on prebuilt units? Regards... James Cameron Digital Equipment Corporation (Australia) P/L (cameronjames@snoc01.enet.dec.com) Brought to you by Super Global Mega Corp .com