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Intercom Aiphone LEF-10 to walkie talkie

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rus40

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Hello,
I want to connect a walkie talkie to my intercom master station so i be able to use it from a distance.
For example when someone call to the master station ,the signals to go to the walkie talkie and to be able to talk to the intercom through the PTT walkie talkie.
My idea was to connect the speaker(intercom)to the mic(walkie talkie) ,and the mic(walkie talkie) to the speaker(intercom).The intercom is two way ,and when it rings after a 10sec i will trigger a relay to press the talk button so i will be able to hear what the people say and when i press the talk button of my walkie talkie to be able to answer them .
So when i want to end the conversation i will do this with a time off delay relay .
 

The trouble is, as long as the walkie talkie is transmitting, it can't receive. You could key it with a VOX (voice-operated relay) circuit. You would lose the first syllable of the first word, then you would have to wait for it to stop keying before you could reply. The squelch circuit of the walkie talkie would have to be wired to key the intercom when it received a signal.

It would be easier, and probably cheaper, just to buy another wallkie talkie and have the person use that instead of the intercom.
 

You mean to use this VOX relay to cut off the walkie talkie talk button wich is connected to the intercom so to be able to talk with the other one right? but when the button is pressed how i can talk to send a command to the VOX ?
I know that it will be easier to change the system ,but they don`t wan`t so i try to figure other way to do this :) !
Thanks for the reply!
 
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    igor

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No, the vox would cause the walkie talkie connected to the intercom to transmit when the intercom picked up a sound. In order to prevent transmitting every random noise, you'd want to disable the vox until someone presses the "call" button on the intercom remote. How many remotes does this intercom have, and do you want to hear all of them?
 

It have 6 remotes and yes i want to hear all of the.But they all go to the master station .It doesn`t matter for me to know from witch station the person is calling .So you mean that when the person press the start button and start to talk The vox will activate the talk button inside when it stop it will gonna release it so i will be able to talk .
 

Yes, using the call button as a PTT would work. You'd have to defeat any alert tones the master intercom unit might generate. (I once rebuilt one that had been struck by lightning, but don't remember if it beeps when called...this one wasn't used that way.)
 
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    rus40

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Hi your idea is very good .But now i encounter a different problem ,when i open the walkie-talkie i found that they use speaker and for a mic .So i connect the cable directly to the mic so and the logic says that when i don`t push the PTT button it should act as a speaker (and i plan to reveres that function with a relay too),but when i push the button i hear my voice trough the intercom speaker and when i press the Talk button on the intercom the problem is that the voice doesn`t transfer to the remote intercom(substatation).Can the problem be in the differences between the mics ?
 

I don't quite follow. Are you pressing the talk button on the master and not being heard in the remote, or the other way around?
 

Yes when i press the button on the master i`m not being heard in the remote !If i`m not pressing the button on the mater i hear my voice in the speaker of the master.
 

Where is your voice coming from, the walkie-talkie? Does the volume control in the intercom affect that volume? I have to take a closer look at that intercom. I have one that's burned out. (Lightning DOES strike twice!)
 

I looked at an Aiphone intercom and noticed:
1) The remotes are selected with a mechanical switch
2) The master intercom has a microphone separate from the speaker

So, because of 1) you have to be at the master unit to select the remote. Because of 2) you have to switch the walkie-talkie audio from one connection to the other, though perhaps you could bypass the part of the PTT switch that switches the speaker between the microphone and speaker functions. This would make it useless as a walkie-talkie. Why not just get another walkie-talkie?
 

So for 1)i planed to do this with a relays or just one relay and for the 2)what you mean by bypass the PTT switch .I was thinking to make it switch from the VOX .To buy a new walkie-takie is a good idea ,but i`m not sure which one is with separate mic and speaker ?
 

What frequency do your walkie-talkies operate at?
 

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