Ένα και μόνο εύρημα δίνει η σύμφραση για την οποία αναζητείς απόδοση.
Η κατά λέξη μετάφραση 'closed frequency intercom' δίνει επίσης ένα και μόνο εύρημα - από την αγγλική έκδοση του ίδιου (ελληνικού) ιστότοπου.
Το 'κλειστή συχνότητα' όμως, εγώ δεν το καταλαβαίνω...

Ίσως και να το βρήκαν έτσι στ' αγγλικά, κακομεταφρασμένο από κάποια άλλη (εξωτική;) γλώσσα...
Προσπαθώντας να σκεφτώ ποιος υπαρκτός αγγλικός όρος θα μπορούσε να βγει τόσο στρεβλωμένος από back-translations, μου 'ρθε το narrow-band intercom.

Εναλλακτικά, και πιο γενικά, encrypted wireless intercom (αν κι εσύ μάλλον για υπωνυμο ψάχνεις)...

Εικασίες και μόνο.

“closed-frequency intercom” or “closed-frequency wireless intercom” or “closed-frequency wireless internal communication system”

See:

Compare:
Closed-frequency intercom and new generation bulletproof equipment are used. They feature a cutting edge GPS that has a risk alert button and is supervised ...
https://ism.com.gr/language/en/cash-in-transit/
with:
Χρησιμοποιείται ενδοεπικοινωνία κλειστής συχνότητας και αλεξίσφαιρος εξοπλισμός νέας γενιάς.
https://ism.com.gr/χρηματαποστολές/

Sep 30, 2022 — I'm gonna preface this now and say that all of the walkie talkies are on a closed frequency so no one should be able to just pick up what ...
https://www.reddit.com/r/spoopycjades/comments/xs2sc6/creepy...

Nov 3, 2020 — ... a dedicated, closed-frequency wireless connection is set up to avoid building a physical network on site or between buildings.
https://en.yettel.hu/press/press-release/telenor_launches_fi...

Or
closed frequency (of) intercom. circuit

http://www.classicrotaryphones.com/forum/index.php?topic=614...

Making phones ring on a closed circuit / intercom system

Started by sameshirt, January 16, 2012, 03:08:02 PM
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sameshirt

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January 16, 2012, 03:08:02 PM
Does anyone have a diagram or an idea of a product that could be purchased to generate a ring on a

I want to install a phone in the kitchen and one in the basement wired together. I have seen the diagram with a 9v battery and a resistor to get the phones tot talk to each other.

What I would like to have happen is:

When one phone is lifted the other phone rings
In the future it would be great to be able to add a third phone out in the barn.

this is all closed system, intercom type purpose with no outside connection.

Thanks!

Josh

Owain

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#1
January 16, 2012, 03:25:07 PM
Yes, you put a relay in series with each phone, such that when phone A is lifted the relay applies ringing voltage to phone B.

When phone B is lifted its relay disconnects ringing voltage.

And vice versa.