Split-band scrambler for private communications

28 February 2001 Telecoms, Datacoms, Wireless, IoT

CML is offering a simple-to-use dual mode voice-band scrambler that it claims is low cost and that will keep your conversations private. The company's CMX264 frequency domain scrambler uses split-band frequency inversion scrambling which provides a superior level of speech privacy than single inversion methods often employed by other solutions. To further enhance security the device has easy-to-implement fixed and rolling code capabilities. All the filtering required is also featured on-chip.

Typical current requirement is 3 mA at 3,0 V making the CMX264 an ideal solution for any audio application where low power consumption is critical. These include mobile radio and FRS/PMR446 handsets, both wireline and mobile telephones, fixed or rolling code voice scramblers and baby alarms. Energy efficiency is increased by the devices' standby mode.

The CMX264 operates using a simple serial interface or microprocessor control. For full duplex operation Tx and Rx audio paths are separate. In the Tx path, scrambling is achieved by splitting the audio into two parts and frequency inverting each one. The frequency at which the signal is split, the 'split-point', can be either fixed or rolling between four possible settings. This results in a transmitted audio which is unintelligible to eavesdroppers.

Descrambling is achieved by a receive device set to the same split-point as the remote transmitter. Thus if the Tx and Rx devices are synchronously cycled through the same sequence of split points, a clear recovered signal will emerge at the output of the receiver. The use of a 4,433619 MHz crystal allows up to four split points to be programmed. It comes in a in 24-pin SSOP package.

sales@avnetkopp.co.za

Further reading:

Connectivity for IoT devices with SoftSIM
Otto Wireless Solutions Telecoms, Datacoms, Wireless, IoT
IoT device vendors are facing more and more complex cellular connectivity issues these days. Manufacturing is often outsourced to third-party factories and finished devices are being distributed to many ...

Read more...

---

High-power GaN RF amplifier
RFiber Solutions Telecoms, Datacoms, Wireless, IoT
The CHA7618-99F is a three-stage GaN high-power amplifier (HPA) in the frequency band 5,5-18 GHz. This United Monolithic Semiconductors HPA typically provides 10 W of output power allied with 20% of power-added ...

Read more...

---

ExpressLink modules for secure connectivity to AWS Cloud
RF Design Telecoms, Datacoms, Wireless, IoT
u-blox has announced two new modules designed to enable Amazon Web Services (AWS) cloud services for device and fleet management out of the box: the NORA-W2 AWS IoT ExpressLink Wi-Fi module and the SARA-R5 ...

Read more...

---

Cellular antenna for 4G/LTE and 5G NR
iCorp Technologies Telecoms, Datacoms, Wireless, IoT
Antenova’s new ‘Affini’ (part number SRFL064) is a flexible printed circuit (FPC) antenna for the LTE, 4G and 5G NR networks in global markets. This antenna covers all main 4G bands plus 617-698 MHz which ...

Read more...

---

Passive MMIC diplexer
RF Design Telecoms, Datacoms, Wireless, IoT
The MDPX-0710 from Marki Microwave is a passive MMIC diplexer with passbands from DC to 7 GHz (low band) and 10 to 26,5 GHz (high band). It has an insertion loss of less than 0,9 dB within its passbands ...

Read more...

---

Automotive-grade GNSS signal splitter
RF Design Telecoms, Datacoms, Wireless, IoT
Tallysman Wireless has added the TW162A automotive-grade ‘Smart Power’ GNSS signal splitter to its line of GNSS accessories. The device supports the full GNSS spectrum: GPS/QZSS-L1/L2/L5, QZSS-L6, GLONASS-G1/G2/G3, ...

Read more...

---

u-blox extends ‘bring your own SIM’ approach to MQTT
RF Design Telecoms, Datacoms, Wireless, IoT
u-blox has introduced a service that gives IoT sensor network developers the flexibility to combine any cellular connectivity with all the benefits of MQTT communication. The u-blox MQTT Flex service ...

Read more...

---

GNSS correction service receivers for cm-level accuracy
RF Design Telecoms, Datacoms, Wireless, IoT
For designers who require reliable centimetre-level positioning accuracy, e.g. for the industrial navigation and robotics markets, a new suite of products and feature additions have been rolled out by ...

Read more...

---

4xMIMO cross-polarised antenna
RF Design Telecoms, Datacoms, Wireless, IoT
The TGX.04 from Taoglas is a 5G/4G 4xMIMO dipole antenna that operates from 450 to 6000 MHz. It supports worldwide sub-6 GHz cellular bands including 5G NR, LTE, NB-IoT, etc. This cross-polarised ...

Read more...

---

High-linearity, multi-octave RF mixers for up to 40 GHz
RF Design Telecoms, Datacoms, Wireless, IoT
Two new SMT-packaged multi-octave RF mixers featuring high linearity and broad bandwidths have been added to Marki Microwave’s stable of products. The MM1-1040HPSM is an ideal choice for 5G signal ...

Read more...

---