Ramsey Electronics AA7 Active Antenna KIT Parts List, Capacitors, Resistors, Semiconductors

Page 6

figure of the amplifier circuit which amplifies the signal from the antenna rod before it gets to the receiver's RF input.

We mention these things, with no need to get into a lot of engineering detail, just to let you know that "Active Antennas" are a serious topic among contemporary receiver designers, and that we did our homework in bringing you the economical AA7.

AA7 ACTIVE ANTENNA KIT PARTS LIST

Please verify that the following items are present before starting assembly.

CAPACITORS

ˆ1 100 pF disc capacitor (marked 100 or 101) [C3]

ˆ4 .01 µF disc capacitor (marked .01, 103 or 10nF) [C1, C2, C5, C6]

ˆ1 4.7 µF to 10 uF electrolytic capacitor [C4]

RESISTORS

ˆ1 100 ohm (brown-black-brown) [R4]

ˆ2 100K ohm (brown-black-yellow) [R3, R6]

ˆ1 220K ohm (red-red-yellow) [R2]

ˆ1 1M ohm (brown-black-green) [R1]

ˆ1 10K ohm PC mount potentiometer [R5]

SEMICONDUCTORS

ˆ1 Dual gate MOSFET transistor (4 pins) [Q1]

ˆ1 2SC2498 or 2570 NPN VHF transistor [Q2]

CONTROLS AND HARDWARE

ˆ2 DPDT push switches [S1, S2]

ˆ2 PCB- mounted RCA jacks [J1, J2]

ˆ1 9 volt battery hold-down clamp

ˆ1 9 volt battery snap connector

ˆ1 Telescoping whip antenna with mounting screw

REQUIRED, NOT SUPPLIED

ˆ1 9 volt battery (alkaline or heavy-duty)

OPTIONAL

ˆ1 Ramsey case and knob kit, or your own enclosure

ˆ1 LED “power on” indicator and 1K ohm resistor

ˆ1 External antenna terminated in RCA-type plug

REQUIRED TOOLS

ˆSoldering Iron (Radio Shack #RS64-2072)

ˆThin Rosin Core Solder (RS64-025)

AA7 6

Image 6
Contents Active Antenna Partial List of Available Kits Ramsey Transmitter Kits AA7 Active Antenna KIT Introduction to the AA7 Circuit and Device DescriptionActive Antennas Circuitry with a Purpose Resistors AA7 Active Antenna KIT Parts ListCapacitors SemiconductorsAssembly Instructions First Assembly StepsAdditional Suggested Items AA7 AA7 Parts Layout Diagram Soldering the AA7 Printed Circuit Board AA7 Using Your AA7 Initial TestsTransistor Placement Information LED Power On IndicatorTroubleshooting Guide Final Suggestion Ramsey Kit Warranty Total Solder Points Estimated Assembly Time AA7 Active Antenna

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.