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[aprssig] Wanted: tone-based reset module schematics

Brad [VE3BSM] lists.nospam at bpsmicro.com
Tue Feb 7 14:01:59 UTC 2006


Many thanks for all the replies. The timer-based solution has a good
advantage of not requiring any specific intervention, like somebody having
to notice the digi isn't digi'ing and do the tone(s). I'd definitely prefer
an approach that hooks to the PTT line than into the RF. I can see
monitoring actual RF is more robust (like if the radio itself fails into
TX), I want something that doesn't require opening the radio itself or tying
into the antenna feed. In many cases, our digis are installed in commercial
radio sites and in a few share an antenna with other stuff. If I don't have
to touch anything on that end, I won't risk worrying the site owners.

That DTMF decoder sure looks cool though. There's definitely the "nerd
factor" of something like that. :-)

X-10 isn't a viable solution. For one thing, if I have to hike 44 minutes to
get within X-10 range, I might as well hike the extra 1 minute to the actual
door and walk in. None of the sites have PCs or accessible phone lines. The
Lamp/Appliance timer would be a possible poor-man's solution, though in my
experience if you use these in rough (ie. Cold) environments I'd have to
worry about the timer failing. If I buy a good timer, I might as well
splurge for the DTMF decoder.

That Mister-House thing looks cool. I'm going to have to look closely at
that for some other projects I'm playing with.

Brad.
VE3BSM
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