Hi Art First off I have been using 5-tone for many years both commercially and on my amateur radios.
The use of 5-tone is well used by our emergency services .There are key advantages to the use of the different sequencial signalling be it dtmf , 5 tone , 6 tone ,(zvei , zvei 1 ,ccir ,eia various standards associated to the actual single tone frequencies allocated to digits and repeat identifiers.) I have always enjoyed the 5-tone for its diversity. Before the formats were availible in commercial radios we would use adhoc boards such as Microtone MT440 etc and these boards are truely and amaizing in their complexity.Most of these boards you could associate multiple addresses such as the idea of paging pyramid layout where a unit is a member of a number of the levels but not all. Other features we used was emergency call.where a radio unit was paged (or hidden button)and the radios id would be transmitted with a cycle-1-infinity where the mic would go live for a pre-defined time the a programmed break and over and over. The radio could be stunned where a coad over the air would allow the radio to be reinstated as a worker. Kill function would cause the radio to have to come into the workshop for obvious misuse or other. Beleive me when we placed 5-tone into service all knew of the signalling and those who still repeatedly kerchunked etc were either ignorant or just plain stupid. Another reason for the signalling is voice recording where each over can be recorded and traced .When a mobile is switched on a "log on "tone is sent .We have also used these features for "out of vehicle "horn feature where if you do not respond to being paged-the hooter goes twice.Call re-divert to paging you on another radio or 5-tone pager-works very well.(Icom v or U200T has this feature. There are just so many different ways to impliment this feature of signalling. There are also 5-tone repeater panels and telephone interconnects availible. Some technical features that I have found of interest-speed of 5-tone far outways the dtmf.5-tone can work in a lower signal to noise enviroment. Off the shelf modules have more to offer than the like DTMF modules. Enjoy it has your mind as the limits to what you want to acheive. Regards Bradley glen ZS5WT --- [EMAIL PROTECTED] wrote: > Anyone out there using or familiar with 5 tone > selective calling? (Selcall) > Would think it would be useful for paging or > callouts for Skywarn & Red Cross. > > Art - KC7GF > > > > > > Yahoo! Groups Links > > To visit your group on the web, go to: > http://groups.yahoo.com/group/Repeater-Builder/ > > To unsubscribe from this group, send an email to: > [EMAIL PROTECTED] > > Your use of Yahoo! Groups is subject to: > http://docs.yahoo.com/info/terms/ > > __________________________________ Do you Yahoo!? New Yahoo! Photos - easier uploading and sharing. http://photos.yahoo.com/ Yahoo! Groups Links To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ To unsubscribe from this group, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
