----- Original Message ----- From: "Norm of Bandersnatch" > 144-148 MHz is an amateur radio band. License is required. Any > unlicensed > operations would meet vigorous objections by ham. > > The remote control freqs would be appropriate.
REPLY My only reason for mentioning ham radio is because HAM radio operators have beene using this technology for decades. In the early years they built their own without much difficulty or expense. The technique is available to anyone on any frequency anywhere. No special transmiter is required. Your ordinary marine VHF radio is just fine. The squelch break circuit goes on the receiving end and thus not sbject to any licence requirement; and is reliant on the multiple repeated pushing of the PTT button. The only requirement is that the button is keyed so many times within a short period typically 2 - 3 seconds. Ordinary use of the radio will rarely if ever see this happen. It requires a deliberate effort. As far as I know this squelch break detection circuit can even be connected across the receiver speaker circuit. In other words ther are no legal or technical complications to using this on your existing marine radio. Since you are not even transmiting any voice signal, no one is going to be bothereed, let alone hear it. All you have to do is make certain both your receiver and transmitting portable radio is set to the same channel. (pick one). I realize some people are NOT technically inclined. Which is why I mentioned HAM radio operators. A lot of cruising sailors are ham radio perators. They are more likely to have a nodding acquaintance with such technology and those that "roll their own" may even be familiar with how to connect and use it from their own ham activity.. Its about as complicated to use as a garage door opener but has greater range. Something Norm asked about. The effective range is the same as your marine radio. Arild _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to [EMAIL PROTECTED] To unsubscribe send an email to [EMAIL PROTECTED] The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
