Series CCR-40K/CR-40K
Miniature DC–40 GHz
Failsafe SPDT Coaxial Switch
COAX SWITCHES
GLOSSARY
Actuator
TTL Switch Driver Option
An actuator is the electromechanical mechanism that As a special option, switch drivers can be provided for both
transfers the RF contacts from one position to another upon failsafe and latching switches, which are compatible with
DC command.
industry-standard low-power Schottky TTL circuits.
Arc Suppression Diode
Performance Parameters vs Frequency
A diode is connected in parallel with the coil. This diode Generally speaking, the RF performance of coaxial switches
limits the “reverse EMF spike” generated when the coil de- is frequency dependent. With increasing frequency, VSWR
energizes to 0.7 volts. The diode cathode is connected to and insertion loss increase while isolation decreases. All
the positive side of the coil and the anode is connected to data sheets specify these three parameters as “worst case”
the negative side.
at the highest operating frequency. If the switch is to be
used over a narrow frequency band, better performance
can be achieved.
Date Code
All switches are marked with either a unique serial number
or a date code. Date codes are in accordance with MIL- Actuator Current vs Temperature
STD-1285 Paragraph 5.2.5 and consist of four digits. The resistance of the actuator coil varies as a function of
The first two digits define the year and the last two digits temperature. There is an inverse relationship between the
define the week of the year (YYWW). Thus, 1032 identifies operating temperature of the switch and the actuator drive
switches that passed through final inspection during the current. For switches operating at 28 VDC, the approximate
32nd week of 2010.
actuator drive current at temperature, T, can be calculated
using the equation:
Failsafe
I
A
A failsafe switch reverts to the default or failsafe position
when actuating voltage is removed. This is realized by a
return spring within the drive mechanism. This type of switch
requires the continuous application of operating voltage to
select and hold any position. (Multi-position switches are
normally open with no voltage applied).
I =
T
[1 + .00385 (T-20)]
Where:
I
I
=
=
Actuator current at temperature, T
T
Room temperature actuator current –
see data sheet
A
Indicator
Indicators tell the system which position the switch is in.
Other names for indicators are telemetry contacts or tellback
T
=
Temperature of interest in °C
circuit. Indicators are usually a set of internally mounted DC Magnetic Sensitivity
contacts linked to the actuator. They can be wired to digital An electro-mechanical switch can be sensitive to ferrous
input lines, status lights, or interlocks. Unless otherwise materials and external magnetic fields. Neighboring ferrous
specified, the maximum indicator contact rating is 30 Vdc, materials should be permitted no closer than 0.5 inches and
50 mA, or 1.5 Watts into a resistive load.
adjacent external magnetic fields should be limited to a flux
density of less than 5 Gauss.
Isolation
Isolation is the measure of the power level at the output
connector of an unconnected RF channel as referenced to
the power at the input connector. It is specified in dB below
the input power level.
SPECIAL FEATURE
SPDT Switch
Switching High-Power or Highly Sensitive Signals
Ensure the most linear response with the best galvanically
matched contact system in the industry. Extremely low
passive intermodulation is standard on all of our switches.
A single-pole double-throw, bi-directional switch that can
be used as having one input and two outputs or two inputs
and one output.
Switching Time
Carrier
Frequency 1
Carrier
Frequency 2
PIM 3rd Order
Frequency
PIM 5th
Order Fre-
quency
Switching time is the total interval beginning with the arrival
of the leading edge of the command pulse at the switch DC
input and ending with the completion of the switch transfer,
including contact bounce. It consists of three parts: (1)
inductive delay in the coil, (2) transfer time of the physical
movement of the contacts, and (3) the bounce time of the
RF contacts.
870 MHz
SPDT
893 MHz
847 MHz
824 MHz
3rd Order
Intermodulation
5th Order
Intermodulation
–91 dBm
–110 dBm
–134 dBc
–153 dBc
CCR-40K/CR-40K Page 4
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
© 2013 TELEDYNE COAX SWITCHES
CCR-40K\CR-40K\072013\Q3
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