INTRODUCTION TO THE AA7

We believe that you will discover and agree with us that your new AA7 is the best VALUE in a true receiver antenna. In its simplest form, an “active antenna” is a small antenna going through an RF preamplifier to a receiver. Generally, the actual antenna may be of several different styles:

•broad-band (no tuning required)

•fixed-tuned (i.e., pre-set for a specific frequency)

•variable-tuning (permits peaking or “pre-selecting” a variety of band choices)

It is easy to assume that the “ideal” active antenna would peak your desired signal or frequency band. Several excellent active antennas are available for this purpose in the $75 - $150 price range, but we would point out that using this kit plus an additional $1 in mini coax to approximate your antenna will work as well, or even better. In our humble opinion, if you really want to spend that much money, you’re better off spending an extra five dollars and buying a good quality receiver. (Study the Ramsey HR-series or our SR-1 shortwave receiver, and you will see how easy that idea can really be!)

If what you want is a great quality active antenna for a whole lot less than others sell it for, the answer is obvious. The Ramsey AA7 active antenna.

An active antenna is a compromise between what is ideal... and what is real. Real antennas are wire or tubing properly measured in meters, not transistors or variable capacitors. If you find yourself in a difficult antenna situation for casual listening or monitoring, we think that you’ll get more satisfaction from understanding and using your AA7 than from wishing that you spent your money on a tunable model would result in a real antenna!

CIRCUIT AND DEVICE DESCRIPTION

The AA7 features two independent, switchable RF preamplifiers. The HF (high frequency) section is located on the upper middle section of the schematic on page 6, while the VHF (Very High Frequency) / UHF (Ultra High Frequency) section is located on the lower middle section.

Simple switching circuits play a major role in the practical use of the AA7. S2:B connects the RF input and output connectors in the “power off” position. This gives the receiver non-amplified access to the auxiliary antenna jack, as well as the on-board rod antenna. With S2 in its “power on” position, S1 selects between the two independent antenna amplifier configurations (HF or VHF).

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Ramsey Electronics manual Introduction to the AA7, Circuit and Device Description
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AA7 specifications

Ramsey Electronics has long been a name synonymous with quality in the realm of amateur radio equipment and communication technologies. Among its standout products is the Ramsey AA7, a high-performance audio amplifier that encapsulates advanced features and specifications aimed at both hobbyists and professionals in need of superior sound amplification.

One of the main features of the AA7 is its robust power output. Capable of delivering up to 7 watts of audio power per channel, it is an ideal choice for driving speakers across various settings, whether in a home audio system, workshop, or small public address system. This level of power ensures that users can experience clear and impactful sound, with performances that fill the room without distortion.

The AA7 employs Class AB amplifier technology, which strikes a fine balance between high fidelity and efficiency. This design is particularly beneficial as it provides reduced heat generation when compared to Class A amplifiers while still retaining audio quality. The result is a unit that remains cool to the touch during extended use, allowing for reliable and consistent sound performance.

Another key characteristic of the AA7 is its wide frequency response, which spans from bass-heavy lows to crisp highs. This extensive range allows for versatile applications, accommodating a variety of music genres and other audio formats without compromising quality. The built-in tone controls allow users to fine-tune the sound to their liking, offering adjustments for bass, treble, and overall volume to ensure an optimal listening experience.

User-friendly design is also a hallmark of the AA7. Its compact size allows it to fit seamlessly into any audio setup, while the straightforward front panel controls make it accessible even for those unfamiliar with audio equipment. The amplifier supports multiple input sources, making it versatile for connecting a variety of devices such as CD players, smartphones, and other audio sources.

In conclusion, the Ramsey Electronics AA7 stands out as a powerful and efficient audio amplifier that combines superior technology with user-friendly design. Its impressive power output, emphasis on sound quality, and convenient features make it a valuable tool for anyone looking to enhance their audio experience, whether at home or in a more public setting. Whether used by hobbyists or professionals, the AA7 offers a compelling solution for high-quality sound amplification.
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