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Call24 Emergency Callboxes

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Jan 20, 2020
Hello All,

Does anyone have any experience into RCS Call24 Callboxes? We had purchased from a college that had moved and in hopes to use them in our parks. The technology is a bit antiquated but it is close to our repeaters so we should be ok... Upon opening the boxes, the technology is pretty simple: Battery/Solar powered, w charger. Then a Kenwood TK series UHF. We were able to log into the radio (see picture below). We replaced the battery and used the frequency, and heard the DTMF codes then a prescripted message, stating that it needs assistance. When we call back from a different radio, the radio, picks up the signal but does not trigger the board to signal thru their speaker (when unplugging the cable the radio can communicate back to ours back and fourth with no problem. We are desperately trying to get the manual for on of these, with no avail. I tried pulling a jumper, that said HSC option, which in turn shut down the DTMF. The programming port isnt anything like I am used to. Please see the pictures below.
As many of these systems are being phased out due to cell phones, wifi, cctv. We are a small town and this could help us.
ANY HELP or advice would be greatly appreciated.


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Sep 28, 2011
Well, I don't have any experience with these, but it would seem that the controller in the box is probably expecting some sort of signalling (e.g. DTMF) before it opens the audio circuit. Otherwise, any transmission on the frequency used would go to all the boxes which is less than desirable in most applications.


I ♥ Ø
Jul 27, 2005
I am a lineman for the county.

I'd agree with wardaddy, I suspect you will need to make some changes to the controller. Give them a call and see what they can do to assist. The blue plug in module on the right side of the board looks to be the addressing method. Likley it's using some sort of signaling to open the speaker so each individual unit can be addressed.
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