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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 > Notch Filters
Maxi-Pole Notch Series
Specifications:
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Maxi-Pole® Notch Filters offer all of the same performance features as the Mini-Notch filters, with the advantage of an improved notch shape factor. |
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Performance:
The following plots illustrate approximate performance (not representative of all frequency ranges):
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Product Numbering Table:
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Series |
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Frequency (MHz) |
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Notch Depth (dB) |
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Options |
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MAXI |
— |
NOTCH |
— |
10 - 30 |
— |
20 |
— |
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1.5 - 4 |
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A |
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4 - 10 |
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B |
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10 - 30 |
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C |
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30 - 90 |
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F |
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90 - 200 |
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200 - 400 |
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225 - 400 |
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Chassis Outline:
Available Options:
A. Internal DC-DC Converter (Eliminates need for high voltage supply. Requires additional 250 mA of 5 VDC current)
B. Serial Interface
C. Custom Frequency Bands (Specify START and STOP frequencies in MHz)
F. Filtered D-Connector
NOTE(S):
1) Options may be limited to particular frequency. 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.
Bias 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 is 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
Switching Characteristics
Vcc = +5VDC, ± 10%; T= -40 to +85°C
Strobe
The filter is tuned within 15 µS to the frequency designated by the tuneword existing on the eight control bit lines when the
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.
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 passband 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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