Dear community,
What are the private subchannels for on PMR walkie-talkies? I've heard that others can still listen in.
Thank you
Kay
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You heard right. Because there are actually NO (private) subchannels. This is a “invention” of the marketing departments of the radio equipment manufacturers.
These “subchannels” are an analog (CTCSS) or digital (DCS) selective call system with which a specific radio partner – or an entire group of radio partners can be called.
How this works is explained here: HOBBYFUNK.DE – All about ‘Funk’
Thank you
These are not real channels.
Only one signal is transmitted which controls the noise barrier of the receiver. This occurs in which a signal having a higher frequency than the speech signal has been superimposed. Either a simple sound or a digitally coded signal.
If the receiver is on one of the “lower channels”, then the noise lock only starts when the signal has the appropriate subchannel number.
You can always send on subchannel “0” the noise lock goes on even without the subchannel signal when someone sparks.
This allows you to adjust the devices in such a way that the receivers only hear something when the transmitter sets the appropriate subchannel. Thus, other radios can be ignored or groups formed.
In theory, the operational manager then has the channel “0” and can thus hear all groups and then, by switching over, selectively radio a group. The groups can only hear each other, but not each other.
This sounds great, but in practice, of course, it doesn’t work. Because a group can’t hear if another group is just sparking and will just start sending while another group is talking straight. The groups thus bother each other without notice.
The only meaningful application is that all have the same subchannel so that radio interference and other radios that come within range cannot interfere. Only when the group is sparking, then the noise locks open and interrupt the work of the participants as they have to listen. For this, however, the range is reduced, because if the signal is very weak, one could still understand something, but the signal to open the noise barrier is no longer recognized.
Thank you
Sure.