Ramsey Electronics SA7 manual Broadband Active Antenna, Adding a Tuned RF Input

BROADBAND "ACTIVE ANTENNA"

For situations where a short or indoor receiving antenna is needed, the SA7 preamp will give considerably improved performance even if the antenna is little more than a collapsible whip or short length of wire. For a well-engineered active antenna kit for both HF and VHF, at a breakthrough low price, take a look at our new Model AA7 Active Antenna, which features on-board battery supply, adjustable gain control, heavy-duty whip, HF-VHF mode switching, and jack for using external antenna.

ADDING A TUNED RF INPUT:

The SA7 is designed to give a high RF boost to all that it "hears" - from a few hundred Hz into the GHz region. If you want a preamp that can be "choosy" about what comes from the output, you need to add a tuneable L/C network or filter to the input or output or both. Even though the ARRL Handbook was not much help on soldering SMT components, it's loaded with circuit examples which will show you clearly how to use the SA7's tried and true amplification stages with coils and variable capacitors to accomplish the goals of many different projects. Have fun with your SA7 pre-amp!

SA7—11