4. Actuator Voltage – All standard Charter Engineering switches offer 28.0 Vdc. Other voltages can be supplied depending on the switch model. The following list consists of available voltage options for most CEI switches:

SMA Connectors

Switch Series
SPDT
SPDT Terminated
SP3T-SP6T
SP3T-SP6T Terminated
DPDT (Transfer
Voltage (Vdc)
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0 
   

Type N and SC Connectors

Switch Series
SPDT
SPDT Terminated
SP3T-SP6T
SP3T-SP6T Terminated
DPDT (Transfer
Voltage (Vdc)
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0
28.0, 24.0, 15.0, 12.0 

Please contact CEI for available voltage options with Type SC connectors.

5. Polarity – Each CEI switch offers the option of either a positive (+) or negative (-) common. The exception is the SPDT Failsafe series which does not require a common.

6. Power Interface – All standard Charter Engineering switches are provided with solder terminals. The MS connector (MIL-STANDARD) and D’SUB Miniature Series can be supplied instead of terminals on most switches.

Many catalog pictures feature D’SUB connectors and MS Connectors which are readily available alternatives to solder terminals.

Charter Engineering can also supply other sources of power interface.

Please contact CEI with your custom requirement.

7. Options
Cut off Power Circuit – This applies to latching switches only. A switch that has the ability to disconnect the actuator drive circuit so that D.C. current will not be consumed after switching has been accomplished.

TTL Logic – Transistor-transistor-logic driver circuitry enables the status of the switch to be controlled by the level of the TTL Logic input. Users can apply the power voltage across a pair of designated power terminals and then control switch operation with a 5 volt control circuitry.

CEI’S TTL Logic has a remarkable circuitry which will allow the actuator to draw current only when the TTL is at a high state (5.0 Vdc) and to draw a current of only 5.0 mA max at a low state (0 Vdc). This amazing circuitry will enable your system to run cooler and will save a substantial power supply to the switches.

8. Intermodulation – Passive Intermodulation (PIM) is a form of signal distortion that occurs whenever signals at two or more frequencies conduct simultaneously in a passive device (electromechanical switch) which contains some non-linear response. This interference phenomenon is attributable to many sources such as dissimilar metals, dirty interconnects, or other anodic effects. PIM is of particular concern whenever:

Two or more transmitter channels share a common antenna
Transmitter signal levels are high
Receiver sensitivity is high
Transmitters and receivers share a common antenna
Two or more base station tranceivers are at a single site

CEI recognizes the PIM problem and offers specially designed electromechanical switches to meet low intermodulation requirements.

PIM measurements will vary depending upon carrier frequencies, power level, and PIM frequency.

For further details, please contact CEI.