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Bought cool new digital charger....$89? WalMart?!!
"Meindert Sprang" wrote in message ... "Larry W4CSC" wrote in message ... The radiation from the unshielded wires, with many of them sucking noise from inside the shielded pair because you must hook one side (NMEA B) to many grounds creating a giant HF antenna out of your carefully shielded cabling, is the problem on the HF receivers...... Agreed. It is therefore very important to have RF filtering in a device on the terminals, to prevent any RF from leaking out over wires. Let's just dump all this NMEA crap from 1970 and build Bluetooth compatibility into every new marine electronic gadget. No need for multiplexers for ancient technology mistakes, wires radiating crap to all the radios, wires picking up the 150 watt SSB transmitter and trashing all the NMEA crap it's hooked to. Yes and no. I will have a Bluetooth mulitplexer soon, but the problem with Bluetooth is that it allows either data over a 'serial profile', which is a point to point connection between two devices only (which my BT multiplexer will be: mux - PDA or computer) or you can have a piconet, which creates an RF network with a limit of 8 devices. I wonder though what an average BT device does when 150 W of RF is emitted in the near vincinity.... One think is for su BT or any RF datalink is far away from any approval needed for commercial vessels. Meindert I would much prefer fiberoptic in a commercial or military vessel. It's much more secure and robust in the presence of a hostile RF environment. And in a commercial vessel, it shouldn't be a hardship to route sufficient fiberoptic cabling. True, I can see certain advantages in having a roving port with an RF link to the ship's systems, and if you really feel you need this in a personal watercraft environment, then Bluetooth looks like the way to go. But RF data links are a "complicating" option, and you should always try to make systems as "simple" as possible. Ed |
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