Road Warrior Awards

Road Warrior Awards

Cellular Network Extender Technology – Awards!


5BARz Road Warrior wins CES Innovation 2010 Design and Engineering Award


CES Design & Innovation Award

The prestigious Innovations Design and Engineering Awards have been recognizing achievements in product design and engineering since 1976. Products entered in this prestigious program are judged by a preeminent panel of independent industrial designers, engineers and members of the media to honor outstanding design and engineering in cutting edge consumer electronics products across 36 product categories.









Road Warrior Features/Specs


Road Warrior Position Paper

5BARz Road Warrior Position Paper

For signal boosters to maintain network transparency, at a minimum, two key elements are essential; 1) maintain stability, and 2) maintain signal fidelity.

In the industry, there have been concerns with the stability of signal boosters both from a design and installation standpoint. It is important to eliminate sources of instability in the design, and have detection capability and algorithms in place to squelch any oscillations that could occur from poor installation. CelLynx designs meet both these requirements. CelLynx is conservative in design, and in continuous monitoring.

The main concerns for design related stability issues are inherent gain stage stability and controlling bi-directional loop gain.

Stage-by-Stage Design
In addition to basic in-band matching, the paper design of each gain stage contains a stability analysis over a wide operating frequency range ensuring the device is stable up to the point where its gain is negligible. This is done for each stage in the amplifier. During prototype testing, these stability results are confirmed. In addition to room temperature, testing includes temperature extremes. This combination of analysis and prototype testing provides great confidence that the inherent amplifier stages are stable.

The loop gain of the amplifier is a concern since the amplifier design is bi-directional, sharing ports on the inputs and outputs. The operation frequencies are separated using duplexers within the signal booster. These duplexers have very high rejection within the operational band of the duplex frequencies. For example, for the Up-link amplifier chain, the duplexer provides very high rejection in the full Down-link band. Due to the characteristics of these duplexers, the operational bands and frequencies above and below these bands are well controlled. The frequency that is most problematic is the ‘cross-over’ frequency, that is approximately half way between the two operational bands. As shown in the graphic below, this is the area where the combined duplexer filters have the least rejection.

The cross-over performance of a duplexer is characterized in the design phase, and multiple duplexers and band pass (or high and low pass) filters are used to provide the required rejection. During prototyping, the loop gain can be directly measured by removing one component (a blocking capacitor for example) and inserting two RF cables to measure the loop gain directly. This is not practical in production, as it would require additional connectors (cost), and disrupt the standard manufacturing flow. Due to the technological nature of the duplexers, there is manufacturing variation in the performance of the cross-over region, and the design must contain significant margin to ensure high yields in the factory. This is determined from working with the filter suppliers to evaluate electrical variations of multiple manufacturing lots, and distributions within lots. Then, statistical analysis can be performed to determine the optimal number of filters within a design.


Manufacturing provides a controlled environment where external isolation issues (such as improper installation) can be eliminated. This presents an ideal condition to confirm the performance of the cross-over loop gain. A simple test is performed to determine whether the amplifier is capable of full open loop gain in both directions while remaining stable. If any instability is found, gain is reduced, and the firmware is then able to limit the operational gain of this unit to eliminate any chance of a positive loop gain during field operation. If the gain reduction is severe, this unit would be considered a failure, and need to be re-worked or scrapped. This maximum gain parameter will be monitored in production to pro-actively monitor suppliers’ filter performance.

In the installation of a booster amplifier, it is important to maximize the isolation between antennas. Isolation can be reduced due to positioning of antennas or due to close proximity objects causing reflections and antenna pattern changes. A poorly designed booster may oscillate under such degradations in external isolation. CelLynx products limit the usable gain to ensure the devices remain stable.

Since the maximum gain of the product occurs in the desired bands of operation, any antenna isolation issue will cause stability problems within these same bands of operation. In this case, the internal detectors will be able to detect oscillations, just as they are able to measure desired signals.

  • Initialization
    When the signal booster begins operation after a power cycle, the gain of the unit is ramped until a large signal is found, or maximum gain is reached. If a large signal is found, it is assumed to be an oscillation. This is a very conservative approach, since if it is a real signal, the full gain potential of the unit will not be reached. From this gain level found (either max gain, or gain where a power threshold is reached), the operational gain is reduced by a specified value to ensure stability. This ramp process is performed for each of the operational bands in the unit.
  • Dynamic Changes
    During normal operation, the output power of each band is continually monitored. A high value detector reading is possible due to real traffic signals, or from a change in antenna isolation causing a stability problem. There are two main methods to squelch an oscillation, absolute power limiting and oscillation detection limiting.
  • Absolute Power LimitingIf the output power measured is above a predetermined threshold, the gain is continually reduced until this power level falls below the threshold. Once the threshold is crossed, an additional gain reduction is introduced for margin. If the output power was due to an oscillation, this additional gain reduction will squelch the undesired signal.  This method lowers the gain sufficiently to ensure that no oscillation is possible. The drawback is there is no distinction between a desired traffic signal and an oscillation. To that end, the gain and output power for a real traffic signal is reduced more than necessary, and full boost is not available. It would be more desirable to keep the output power close to the linearity capability of the amplifier chain. With this method, the power level of a real signal is reduced and the range of booster performance is limited.
  • Oscillation Detection 
    In a similar manner to the above algorithm, if the threshold power is exceeded, the gain of the amplifier is reduced until the threshold is crossed. The difference here is that near threshold, the statistics of the signal are monitored to determine if the signal is a real traffic signal or whether from a potential oscillation.

A real traffic signal will follow the change in gain, thus a 1 dB change in gain should roughlyequal a 1 dB change in power.

If the signal power is due to oscillation, a 1 dB change in gain will result in a large change in power. If a unit is deep into oscillation (gain exceeds isolation by more than a couple dB), the output power is near saturation, and a small gain change does not change power significantly. But if the unit is barely in oscillation, the output power is in the linear region (close to the threshold value) and a small change in gain will likely result in no power detected to a power above threshold. For a lightly oscillating unit, at minimum, the change in output power is significantly larger than a 1:1 scale as for a real traffic signal.  Once the signal type (real traffic or undesired oscillation) is determined, the unit can apply the appropriate action; automatic power control around the threshold for a real traffic signal, and a gain step reduction to squelch an oscillation.

This algorithm improves the boost level for high power level traffic signals as no additional gain reduction is required.  In addition to these algorithms, the unit will shut down in the event that the gain can not be reduced sufficiently to squelch an oscillation.  In the CelLynz 5BARz Road Warrior, both methods of oscillation prevention are utilized.  Power for real signals is limited to ensure oscillations can be detected properly, and if/when an oscillation is detected, further gain reduction is induced for margin.

  • Signal Fidelity
    The signal fidelity concept is much more straight forward than stability. Amplifiers, just like phones and base stations, must meet emissions requirements set forth by FCC. In order to maintain output power control, each up and down link channel incorporates a peak power detector to measure power after the last active device. This power level is maintained in the linear region (lower than P-1 dB over temperature). Although the unit is certified by FCC to operate at higher power levels, CelLynx maintains these lower levels for operating margin, as well as ensuring ability to detect oscillations as described above. As an example, CelLynx tested our current Road Warrior amplifier against a competitor’s product. The test signal used is a Down-link waveform, 3GPP Test Model 1, with PAR=11 dB. The test was performed on an up-link Cellular channel. This PAR is extreme for Up-link, but not unexpected when two or more phones are amplified by the booster.

The CelLynx booster maintains this power level as input power is increased, and the peak power level is just below 1 dB compression. The competitor’s output power continues to increase output power by another 2 dB with 5 dB higher input power. The peaks of the waveform are clipped by at least 5 dB.

The CelLynx booster signal fidelity is excellent, and the output spectrum is well within the FCC requirements.

CelLynx designed 5BARz technology to guarantee stability, then added proper firmware to eliminate set-up and environmental problems. CelLynx products substantiate that a cell signal booster can be installed in real-world field applications and remain stable with linear operation. CelLynx products are network compatible by design.



Road Warrior Features/Specs


 5BARz Road Warrior Awards
Road Warrior Product Specifications

Road Warrior Product Specifications











 Technical Specs


  • Maximum input power: +20 dBm
  • Output power: 0.25 watt average /1 watt maximum
  • Service Antenna: Cigarette lighter/power cord antenna
  • Frequency Bands: Full-band US Cellular and full-band US PCS
  • System gain Cell/PCS: 40/45 dB, self-optimizing
  • System noise figure: 5 dB nominal at maximum gain
  • Power Supply: 12 VDC
  • Power dissipation: 6 Watts
  • Dimensions: 5.0″ x 4.75″ x 1.35″
  • Weight: 1 lb (0.45kg)



Road Warrior Position Paper


   Road Warrior Awards   
5Barz Network Extender Feature Sets

5Barz Network Extender Feature Sets

  • Simple Plug and Play Installation.  For consumers this is one of the more exciting features.  To set-up, turn on and make use of the Network Extender all the consumer needs to do is PLUG IT IN and TURN IT ON.  It really is that easy!
  • Covers 4000 Square Feet of space in any home or office
  • Adaptive RF Link Adjustments
  • Automatic self-calibration at power up
  • Automatic adaptation to environmental changes to maintain optimum performance
  • No signal power oscillations
  • Network protection
    • Monitors ensuring no harm to network
    • Continuous AGC to maintain linear operation, reduce gain at high input levels
    • Auto-shutdown at high RSSI levels, temperate range exceeded
    • Activity detection: uplink active only when handset is active
    • Fast oscillation detection and suppression
    • High out-of-band rejection to minimize spurious emissions
  • Self Regulating Intelligent Power Management. Again, nothing for the consumer to do here. Our product self regulates how much power is used by the device at any given time depending on the strength of signal or lack thereof
  • Higher Data Throughput and Much Increased Voice Experience. In simpler term, consumer’s will experience faster upload and download speeds and as well as much increased clarity of sound for voice calls
  • Low Cost to the consumer / Low cost to the carrier. We are selling the Network Extender to carrier’s around the world who will give the devices away to their consumers at no cost
  • Low Power Consumption. Once our product is in the consumers home or office they can expect that the device will use only very small amount of power, about that equal to a router that remains plugged into the wall always
  • No Network Planning Required. Again, our product does not require any planning whatsoever. Take it out of the box, plug it into the wall and turn the switch to “ON.”
  • Self Sensing & Optimizing Coverage. Further to our no planning or set-up requirement, our product has been developed to find each consumers specific coverage or connectivity problem and optimize that consumers connection, all automatically
  • Up to 80% more battery life, 10x better data throughput.


5BARz Network Extender Technical Specifications

5BARz Network Extender Technical Specifications

  • Integrated Antennae = Receive and Transmit Antenna in One Device / Form Factor. PATENT HELD by 5BARz
  • Automatic Balanced Power Management to Avoid Interference with Macro Network = PATENT HELD by 5BARz
  • Smart Signal Processing for Interference / Echo Cancellation = PATENT HELD by 5BARz
  • System Gain: up to 70 dB. The Network Extender exceeds the System Gain from any other such product currently available on the market, anywhere in the world.
  • Physical dimensions: 259.13 mm height, 62.95 mm base, 237.21 mm wide (10.1 inches height, 2.47 inches base, 9.3 inches wide)
  • Weight: 635 grams
  • Simultaneous users: Our product can easily manage up to ten (10) users all using any of their mobile devices at the same time
  • Frequency bands supported: 2100, 850, 900, 1700
  • Supported Modes: Our existing product currently supports both 2G and 3G, as well as the 1800 band. Our next version of this product will also support 4G LTE
  • EVM Maximum 12.5%.
  • Power consumption: 5W
  • Group Delay: 100 nSec max
  • RF Composite Power
  • Uplink: +20 dBm +/- 1 dB
  • Downlink: +10 dBm +/- 1 dB
  • Automatic Gain Control Range >30dB
  • Gain Flatness: +/- 1 dB in 3.84 MHz
  • Noise figure: < 5 dB
  • Operating Temperature: 0 degrees c to 50 degrees c.
  • Storage temperature: -40 degrees c to +85 degrees c.
  • External supply: 100 – 240 VAC
  • Commercial Grade Hardware
  • Complies with new FCC requirements
  • Wideband / Narrowband Support
  • Factory Tuned for Channels / Configurable to any Channels
  • Automatic Noise Suppression
  • No Backhaul Required
  • No Rebroadcasting of Other RF Signals
  • No Protocol Modifications
  • No Latency
  • Small Footprint