Like cell phone network intercoms, a full-duplex digital spread spectrum intercom, also called a simultaneous talk and receive intercom, provides clear two-way audio communication with the ability to simultaneously talk and listen, just like a telephone conversation, but it doesn’t require telephone service. However, unlike cell phone network intercoms, there are range limitations. These digital intercoms can communicate at up to 4000 feet in line-of-sight in ideal conditions.
With these intercoms, you place base station intercoms around your client’s home or business wherever they want to receive calls from visitors. These systems provide very high-quality audio without any per usage charges like cell phone network intercoms, but their cost is also higher and you lose the mobility cell phone intercoms give you. Regardless, these are excellent systems for more affluent customers who don’t want to tear up their property with trenching and running wires.
The full-duplex speakerphone capability has background noise immunity so when noisy trucks or other vehicles pull up to it, clear voice communication can still take place.
Dual built-in switch relays that can be used for remotely controlling gates or other devices from the inside intercom. There is also an input for a Request-to-Exit button or vehicle loop detector that can open the gate when activated. Another input can be used for “auto calling” the inside station when a vehicle loop detector or motion detector detects someone arriving at the intercom.
“Call” switch connections on the outside unit are used to connect a motion or photo beam sensor. When the sensor is tripped, the unit automatically goes into transmit mode. A ringing tone sounds on the Indoor unit(s) (and outdoor) and then whichever indoor unit answers the call, the call will become private between those indoor and outdoor units.
“Exit” switch connections are used like the Call switch, but the sensors are placed on the exit side of a door or gate. When the sensor is tripped, the Inside unit will be alerted. Two relays or switches inside the Outdoor unit can be used to activate a gate or door opener, turn on a light or ring a bell. These are commonly used to activate gate controllers. If you have multiple outdoor units, only the relays on the unit calling in are activated.
Digital Spread Spectrum Intercom features include:
- Full-duplex speakerphone with background noise immunity
- Dual “Strike” Relays for controlling two independent access points
- RTE switch support
- Aux input port for “auto calling” inside unit after detecting a vehicle or person
- Multiple outdoor and indoor units can be utilized together.
- Each outdoor unit can be assigned a unique “access point ID”
- Vandal-resistant stainless steel outdoor enclosure with illuminated “Call” button
- Indoor units: plastic housed desktop or heavy-duty stainless steel wall mount
- Solar panel-ready: designed to easily utilize solar panels for power in remote wire-free applications
- Long range audio communication: up to 4000 feet (direct line-of-site)
- Robust radio communication with excellent interference immunity against cell phones, pagers and handsets.
- 10 selectable radio channels for cross-talk immunity between adjacent facilities
- Secure communication link – proprietary encryption
- Simple “dashboard -like” interface that visually guides installer
- Built-in lightning protection on ALL terminals - immune to 20K Volts, 10K Amp surges
- Multiple base stations can be used. The base station that responds first to a callbox takes over communication
Two-Way Radio Intercoms
The third type of wireless intercom system uses two-way radio frequencies, which makes it the easiest of all the systems to install and least likely to have installation problems. Like a two-way radio, these systems are push-to-talk, which means only one side can talk at a time. The benefit is that their range can be measured in miles under ideal conditions. While your client may not need that kind of range, having this distance ability means they are far less susceptible to obstructions that could cause interference with communication. This makes installation worry free since there are very few instances that this system won’t work for your client. They are extremely simple to install and set up with very few technical issues experienced.
This self-contained unit is attractive, discreet, easy to install, and is less a target for vandals than a separate camera and enclosure would present.
Applications include vehicle entry gates and healthcare providers like managed care facilities.
Since many of these products are available over the Internet as do-it-yourself projects, the locksmith’s challenge is to convince your customers that you specialize, customize and assemble the exact...