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ContinuousWave: The Whaler GAM or General Area
Digital Selective Calling (DSC) VHF
|Author||Topic: Digital Selective Calling (DSC) VHF|
posted 05-21-2001 09:03 PM ET (US)
I finally got a chance to play with the
DSC on my Standard Horizon Spectrum at the
SF Rendezvous this weekend. I like it.
DSC allows two VHF radios to communicate
The most important function of DSC is a
You can also use DSC to call your buddies. You
posted 05-21-2001 11:40 PM ET (US)
Yup. DSC works pretty well. It's like ringing someone up on the telephone; only they know that you are calling, although everyone would of course hear your conversation on VHF.
I did find that, with today's technology, the access of the DSC feature has a ways to go. Entry of the MMSI numbers isn't that convenient; you couldn't very easily do it on the fly. Scrolling through screens to use the feature was easier, though not where it might be in the future. You almost need a bigger VHF screen.
Still, when you're dialed in, its great to know that the person you are calling with DSC will absolutely know that you are calling. The "ringing" sound is quite distinctive, and most definitely insistent!
posted 05-22-2001 12:37 AM ET (US)
I haven't made a thorough study of DSC yet, but I was under the impression that the tranmission was not altered, that is, it is not "digital", but rather the receiver squelch circuit is changed so that it only responds to transmissions which are coded with the proper digital identification.
The radio still transmits in 15F3 frequency modulation, but with a digital number encoded in the modulation, right?
posted 05-22-2001 10:13 AM ET (US)
No, I don't think it's squelch coded like
the FRS radios.
There's definately a modem that modulates the
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