Spruce Creek Microwave
HF Digital Preselector For Software Defined Radios
Multiband Preselector
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Built in High voltage Power supply
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RS-232 Interface
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No programming from external host
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Modular design for additional Frequency bands HF and UHF
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2 pole Chevbyshev low ripple frequency response
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Continuous Sweep and Hop ability
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Band-widths from 2% to 10% available
Tuning Range 1.8MHZ to 30MHZ
Four Select-able: 1.8MHZ to 4MHZ
4MHZ to 8MHZ
8MHZ to 16MHZ
15MHZ to 30MHZ
3DB Bandwidth 5% nominal
Insertion loss 4 DB MAX
Return Loss 10DB Minimum (50)
IP3 +30 DB
Control Interface RS232
Tuning Steps 255
Tuning speed 250 us min
Transient response Less than 1 Microvolt
Power +5 VDC @750MA
Connectors RF SMA Female
Control Connectors Standard 9 Pin D
USB Mini
Specifications:
HDP 2-1.8=30
The Digital Preselector Filter is tunable in octave bands used to enhance receiver performance by reducing large
interfering out of band signals that cause distortion.
The preselector can be used in a variety of applications including software defined radis (SDR),conventional receivers, and remote co-located sites.
The Digital Preselector Filter contains a controller/power
supply and as many as four filters modules. Each modual
supports 255 unique frequency settings. Each module is calibrated to provide a tuning range with the least amount
of ripple across the band. Whena new frequency is requested, the controller selects the band and tuning combination that tune the flter to be centered as close as possible to that frequency. A new frequency is requested by sending an ASCII command via RS-232 or USB.
A complete description of the communications protocol can
be downloaded.
