This is the "naked" version of the HABAmp designed for you to mount in your own case. If you would like the version in a Hammond Enclosure please click here.
This version has the LNA before the SAW filter.
Originally developed by Mark Jessop (VK5QI) a member of the Project Horus team, the HABAmp is a small filter and preamp PCB designed to go between a USB SDR Tuner and an antenna. Using a SAW bandpass filter and a low noise amplifier (LNA), it stops out of band intermodulation while providing additional gain for increased sensitivity.
The LNA used is a MiniCircuits PSA4-5043+ which provides approximately 21dB of gain, and has a 0.75dB noise figure (NF). To stop out of band intermodulation a 433MHz EPCOS SAW bandpass filter, which has a 10MHz bandwidth is also present. The insertion loss of this filter is approximately 2dB, which does increase the overall noise figure of the HABAmp to 0.75dB.
The HABAmp has flexible powering options. The LNA itself runs from 3-5V without any biasing resistors, and draws 56mA. Power can be supplied either using a bias-tee (power up the coaxial cable), or on a 2-pin header. A low-dropout regulator is fitted allowing the board to be supplied with a wide voltage range from 5V to 26V. Selection between header power and bias-t is done by a small switch on the PCB.
Please check the associated items for a SMA to SMA joiner to connect this to a USB Dongle.
Supplied in a Hammond enclosure 2 x Medium SMA end launch connectors with washers and screws and a power plug for you to solder to the power supply of your choice.
Maximum voltage to the header is 26V.
Datasheet here : https://dl.dropboxusercontent.com/u/63720513/HAB%20Supplies%20Datasheets/HAB-FILTER433.pdf