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Integrated Cosite Equipment Developed for UAV Applications
10/08/2010
Cosite Analysis - Understand Impacts to Range Performance in Your Fielded Applications
04/09/2010
RF Cosite Communications Interference Simulation and Resolution Webinar
09/15/2009
Cosite Interferance Mechanisms Webinar
Mitigating Self-Generated Communications Interference
Inadequate isolation between a transmitter and a receiver in a cosite environment results in the receiver’s diminished ability to process a weak desired signal- a condition termed “desensitization”.
All Products > Bandpass Filters > Max/4R Series
Maxi/4R Series
Specifications:
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Frequency Coverage (8 bands):
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1.5 MHz to 1 GHz
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Input/Output Impedance:
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50 Ω
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Inband RF Power Handling: |
1 Watt (input)
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Inband Third Order
Intercept Point:
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+40 dBm (input)
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Inband Second Order
Intercept Point:
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+100 dBm (input)
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Tuning Control:
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8 bit parallel
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Tuning Speed:
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50 µS |
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DC Power:
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+5 VDC @ 10 to 1000 mA
+100 VDC @ 2 mA
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Operating Temperature Range:
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-40 to + 85°C
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Center Frequency Drift:
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80 PPM/°C
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The MAXI/4R Series of tunable filters provides 4-poles of filtering, for even better rejection than our standard Maxi/Pole filters. The chassis has been ruggedized to better handle the vibration and shock environments often encountered in customer applications (ie. ground-mobile, airborne, etc.). The product line includes several standard designs in various frequencies to support almost any application.
Performance:
The following plots illustrate approximate performance (not representative of all frequency ranges):
Product Numbering Table:
Available Options:
A. Internal DC-DC Converter (Eliminates need for high voltage supply. Requires additional 500 mA of 5 VDC current)
B. Serial Interface
C. Custom Frequency Bands (Specify START and STOP frequencies in MHz)
F. Filtered D-connector
NOTES:
1) Options may be limited to particular frequency bands and/or performance levels.
Consult factory for your application.
2) Filters are aligned and tested using a High Bias of +100 VDC unless otherwise
specified by the customer.
Interface and Control Notes:
Frequency Tuning Address
Maxi-Pole Series filters utilize an eight-bit scheme for tune words to digitally control tuning of the center frequency. For further information on how to calculate tune words, please see the Frequency Tuning Address Application Note. There are 250 equally spaced tuning increments across each standard filter band, resulting in 251 tune words from 00000000 to 11111010. The last 5 tune words are reserved for housekeeping functions:
Bia Voltage Requirement
A bias voltage is required to reverse bias the PIN diodes used to tune the filter. Very little static current (less than 1 mA) is needed. A minimum of 30 Volts is recommended for proper filter operation, although in some instances voltages as low as 12 Volts will provide acceptable performance. As this voltage is increased, the power handling capability and intermodulation are improved as shown below. A bias voltage of +100 VDC is recommended for best results, and all filters are tuned and aligned this way from the factory unless otherwise specified by the customer. An internal low EMI supply, powered from the +5 VDC input, is available as an option.
Interface Options
The filter comes standard with an 8-bit parallel interface, although a serial interface can be specified as an option.
DC Control Interface Characteristics
Vcc = +5VDC, ± 10%; T= -40 to +85°C
Switching Characteristics
Strobe
The filter is tuned within 50 µS to the frequency designated by the tuneword existing on the eight control bit lines when the STB line is brought low. Once strobed, data existing on the tune control lines is ignored until strobed again. Maximum strobe rate for frequencies above 10 MHz is 2 kHz, and below 10 MHz is typically 1 kHz. Consult the MaxiPole Selection Guide for the maximum strobe rate in each frequency band.
RF Power Handling Capability
The filters are designed to operate with RF input power levels up to 1 Watt (+30 dBm) inband (see curves above under Bias Voltage Requirement). Signals in the filter stopband up to 5 Watts at the input will not cause damage to the filter.
Temperature Effects
Over the –40 to +85°C temperature range, filters will exhibit a temperature drift of less than 80 PPM/°C, or a total of less than ±0.5% of the center frequency.
Package Outline:
Pinout and Ratings:
Data is believed to be accurate. All data is subject to change without notice.
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