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Question - "man down" notifier on 2-way radio

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Klauser

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Greetings,

I have a question about the "man down" safety feature commonly found on modern 2-way radios (Motorola DP3441e, for instance). Can anyone tell me when this feature was introduced, or at least became widespread ? I have trouble finding information about this particular feature and its history.
Thanks in advance for your help.
K.
 

ramal121

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Man down feature is an extension of the emergency function that has always been included in Motorola's MDC1200 and MDC600.

Can't say when it was first introduced but I remember setting up man down portables in the early 90's using HT1000's. The radios programming needed to support the timers and operator override for it to work correctly.
 

RFI-EMI-GUY

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It used to require separate hardware or board. Now many radios include a sensor that is built in and you pay for option to activate. There are several flavors. Some use the sensor, others require a "lone worker" to activate the PTT on a timed basis. No check in indicates a distress situation.
 

chrismol1

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Man Down has been until at least the 80's. Prison systems were a big hit. You may see HT220/MT500s with a button on the top
 

ramal121

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Man Down has been until at least the 80's. Prison systems were a big hit. You may see HT220/MT500s with a button on the top
For those old of radios that was just an emergency button that had to be manually pressed by the user.

Man down and lone worker is a automated function to put the radio into emergency mode depending on the condition required to activate it. I only remember those being available in programable radios.

Man down uses a tilt switch or something that senses the position or angle or physical activity of the radio. For example if the radio goes horizontal for so many seconds it will send the emergency.

Lone worker does not sense the radio position. It will periodically make a beep or some type of indicator and the user will have a certain amount of time to acknowledge this by pressing a button or whatever otherwise an emergency will be sent out.
 

chrismol1

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Your right I switched them up iirc theres was some SP radio that had the tilt switch, can't recall think it was MT500 or so I recall one from the 70's or 80s with sort of a mecury switch and a timer
 
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