I can set a tone for simplex use but is there a way I can notify a single party through a repeater?
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Any ideas of private notice?
- Thread starter NeoHam
- Start date
I'm not sure I understand what you want to do, but...
If this is only to 'notify' individual stations for some particular reason, the only way I can think of it happening is by everyone sing that repeater using a selective tone for receiving. Sort of like pagers, for the receiver to 'hear' anything, a tone has to be sent that it recognizes. There's a problem with that if everyone doesn't use tones. There would be no 'privacy'. There would also be an almost guarantee of there being interference to users if that selective tone isn't used. It's a "all or nothing" sort of thing and only really practical for private repeater system.
- 'Doc
If this is only to 'notify' individual stations for some particular reason, the only way I can think of it happening is by everyone sing that repeater using a selective tone for receiving. Sort of like pagers, for the receiver to 'hear' anything, a tone has to be sent that it recognizes. There's a problem with that if everyone doesn't use tones. There would be no 'privacy'. There would also be an almost guarantee of there being interference to users if that selective tone isn't used. It's a "all or nothing" sort of thing and only really practical for private repeater system.
- 'Doc
That would benefit the end user only in that they could monitor a repeater and hear nothing until you sent the correct tone. The downside is that EVERYONE else not using a tone would still hear you. Also bear in mind that some, not all but some, repeaters filter out any control tones like CTCSS or DTMF and DCS and do not pass them through.
what do you mean by "notify"? ... and for what reason?
by defination, amateur radio is OPEN and PUBLIC,
</P>
PL, ctss, dtmf,ect does NOT make anything private
I was gonna say that!! D-Star seems to be a very interesting thing to work with. But, the equipment seems pretty expensive to me.
trucker
A long time ago, when I was still taking digital logic classes in school, Radio Shack used to sell these DTMF touch tone decoder chips. I bought two of them. With one of them, I created a home brew 'tone squelch' box. Basically, I combined the DTMF chip with some other logic chips and a relay such that the relay would trip only once a specific sequence of touch tones was input to the DTMF decoder chip. The relay was used to control the audio to the external speaker on my 2 meter rig..
Most VHF/UHF radios have a keypad that can be used to send touch tones (for back when many repeaters had phone patch capability). So I could keep my radio on but muted, and if somebody wanted to get my attention, all they had to do was key up and send a 3-digit touch tone code with their radio, and then I would hear them.
I think some radios has this sort of feature built in, but the Kenwood HT I had back then didn't, so I built it myself. As has been mentioned though, some repeaters block DTMF tones so that you don't hear them on the output. The one I used to use did not, so this worked for me.
-Bill
Most VHF/UHF radios have a keypad that can be used to send touch tones (for back when many repeaters had phone patch capability). So I could keep my radio on but muted, and if somebody wanted to get my attention, all they had to do was key up and send a 3-digit touch tone code with their radio, and then I would hear them.
I think some radios has this sort of feature built in, but the Kenwood HT I had back then didn't, so I built it myself. As has been mentioned though, some repeaters block DTMF tones so that you don't hear them on the output. The one I used to use did not, so this worked for me.
-Bill
