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You want to send a 4VDC to 24VDC signal wirelessly?
What do you mean by 0.1A current draw? Is that the receiver or transmitter?
Most transmitter modules seem to be AC coupled.
I found a couple that are not. You could use an op-amp with a bit of level shifting to convert 4 to 24V signal to 0 to 10V and use a 0 to 10V wireless module.
**broken link removed**
**broken link removed**
Thank you for the quick reply. What I am trying to do specifically is this: I have a Silent Knight fire alarm panel that has an SBUS OUT, which consists of four contacts, two constant power contacts (positive and negative) and two communications (A and B). I am trying to communicate with an annunciator that is usually hard-wired to these contacts. It does not have to be UL listed for fire alarm as I'm just merely trying to find a way to test the status of the system without having to travel back and forth from the devices to the panel.
I need to emulate this hard-wired connection with some kind of two-way radio system or similar. I am not sure if A and B are digital or analog. It may be possible to drop the two power contacts if I am carrying a 24v source, however the panel supervises all connections so it may complain.
Range should be as large as normal two-way radios at least... it is not really critical as this is essentially a tool to make my life easier. If I should get out of range it is always possible to revert to our current method of relaying signals manually through someone reading out the display through DirectTalk.
I am in the United States.
Basically I am just looking for something that if I cut the wire and put in this device, it would continue to operate as if it was still directly connected.
The OP mentioned "two-way-radio" with a range of several miles, which implies licensed, type-accepted transceivers which operate in the VHF or UHF bands. Getting a license for this for unattended data transmission is expensive and quite difficult. There is no "license-free" mobile radio sub-band with a reliable range of several miles. All of the license-free stuff data-link stuff is lucky to have a range of ~100 feet.
I don't know about the US but here one can buy you can get licence free two radio which have and output of 0.5W and should be good up to a mile or so. Licence free two way radios for leisure use
I don't know about the US but here one can buy you can get licence free two radio which have and output of 0.5W and should be good up to a mile or so. Licence free two way radios for leisure use
I think I am being misunderstood. A few hundred feet is fine, I meant 2-way radio as in "walkie-talkie" type radios, perhaps I am using the wrong terms. When I said 4 - 24vdc signals I meant 4 different signals all at 24vdc, not 4 to 24v. Sorry to be vague.
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