 Keeping the Right Perspective on Timing
By E.L. Fox, Jr.
Fox Electronics
Discussions about technology have the power to clarify or the power to confuse, depending on the perspective they take. And when you overlay business desires for smaller, more powerful, more economical, and more energy-efficient components, it becomes even easier to overlook the underlying physics behind technology options.
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LightSquared:
The Show’s Over
…Or Should Be
By Barry Manz
There are a lot of very technically astute people at the Federal Communications Commission. Many have decades of experience at every level of RF and microwave technology. How then might LightSquared’s proposal for a satellite/terrestrial LTE network have ever gotten past its first hurdle? Even a cursory inspection of the plan, in which the company's network would operate extremely close to GPS frequencies at L-band, makes interference to GPS devices almost a certainty. Read More...
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 Microwave Precision Fixed Attenuator
The YAT-1+ is a microwave precision fixed attenuator with a wide bandwidth of DC to 18 GHz, excellent attenuation accuracy and flatness, and a miniature package (MCLP™ 2 x 2mm). Applications include cellular, PCS, communications, radar and defense.
Mini-Circuits
 New 3 dB 90º Hybrid Coupler
Model QH9141 is a connectorized hybrid coupler covering the 150 to 2000 MHz band. Rated for 150W CW, this unit will tolerate severe port-to-port unbalances while operating with an insertion loss of only 0.85 dB maximum. Operating temperature range is -55 to +85ºC.
Werlatone
 New 4 GHz Oscilloscope
The R&S RTO1044 4 GHz high-performance oscilloscope with its 20 Gsample/s sampling rate addresses a wide variety of applications. It is ideal for analyzing fast signals and steep edges. The unit can handle different data interfaces up to a data rate of 1.6 Gbps.
Rohde & Schwarz
 Resistive Power Divider/Combiner
Model 151-270-002 is a 2-way, 50 ohm resistive power divider/combiner that has a DC to 6 GHz operating frequency range, 1.50:1 VSWR, and SMA female connectors. It exhibits 1 dB nominal insertion loss (above theoretical loss), +/-0.5 amplitude tracking, and more.
Broadwave Technologies
See all products in this issue
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New
High Frequency (80 to 135MHz) Low Noise OCXO Improves System
Performance
By Ken Hennessy, Manager Application Engineering, NDK
America
NDK announces the availability of the 9325D
series of OCXOs for applications using a low-noise high
frequency reference source. These high frequency OCXOs (Oven
Controlled Crystal Oscillators) allow increased system performance
by protecting the integrity of the signal. In the past,
a 10 to 26MHz OCXO has been used as the frequency reference
source in applications such as communication base stations
and high-end test equipment. OCXOs are used for their tight
stability characteristics measuring around +/-50ppb, while
achieving low phase noise of -160dBc/Hz at 10kHz offset.
These high end applications often transmit/receive signals
in the 1.8GHz range and use a lower frequency reference,
typically 26MHz, in the PLL. The 9325D, at 104MHz, delivers
the same tight stability, but at a much higher frequency.
This will reduce the PLL ratio by four, thus improving the
integrity of the transceiver signal by providing improved
phase noise and jitter within the system.
9325D OCXO Characteristics:
• Frequency: 80~135MHz (100 & 104 std.)
• Tuning Range: ±3ppm
• Tuning Voltage: 0 to 10V, Positive Slope
• Temp. Stability: -20 to +70°C: ±50ppb
• Aging/Year: ±0.5ppm after 30 Days
• Output Power: 3dBm min, 50ohm
• Harmonics: -60dBc
• Phase Noise:
100Hz offset is -125dBc/Hz
1kHz offset is -150dBc/Hz
>10kHz offset is -160dBc/Hz
• Supply Voltage: +12VDC ±5%
• Power 1.2W after 90 Sec.,
• Consumption at 25°: 3W during Warm-up
• Dimensions: L=25.4 W=25.4 H=12.7mm
The 9325D is a C-Mode oscillator utilizing a Butler type
oscillator and an SC-cut crystal in 5th overtone. This device
also utilizes advanced design methods as compared to earlier
models.
These include:
1. Direct termination of crystal to HIC (previously wired)
2. Cavity and HIC oscillator are thermally connected (bonded
in past)
3. SMD thermistor (leaded device in past)
4. Oven and oscillator circuit on one board (two boards
in the past)
5. Use of resistor as heater (coil heater used in past)
The RoHS compliant 9325D is now available. For pricing,
please contact NDK. A complete set of technical data and
application engineering support is available online at www.ndk.com,
by calling 800-NDK-XTAL (635-9825), or email sales@ ndkxtal.com.
NDK America
www.ndk.com
TXTLINX.COM 81
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MILITARY MICROWAVE DIGEST |
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Dow-Key Microwave
• How to Specify RF and Microwave Filters
Covers cavity, ceramic, LC, crystal and helical filters.
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• Establishing An RF Safety Program
Topics include basic RF safety, standards, monitoring instruments, performing an emitter inventory, and the steps required to create a program.
Narda Safety Test Solutions
• Mounting Considerations for Medium Power Surface-Mount RF Devices
Covers all factors that must be considered when mounting SMT devices.
TriQuint Semiconductor
• Biasing MMIC Amplifiers
How to bias MMICs along with theory and techniques.
Mini-Circuits |
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