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ALL BAND
ACTIVE ANTENNA
Ramsey Electronics Model No.
Stuck for antenna space? Don't want to string any more wires?
This ACTIVE ANTENNA KIT gives you roof-top performance on
a desk top!
•
Great for perking up scanner reception.
•
Dual preamp HF-VHF/UHF front panel switching.
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Circuit based on true active antenna research.
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Performance rivals units costing many times more!
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Front panel RF gain control.
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Uses Dual Gate MOSFET technology for low noise HF amplification,
and a high gain microwave transistor for VHF/UHF.
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Includes internal telescopic whip antenna plus auxiliary antenna
input jack for jazzing up existing antennas.
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Clear, concise assembly instructions carefully guide you to a
finished kit that works FIRST time!
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Informative manual answers questions on theory, hookups and
uses - enhances resale value, too!
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Ideal companion to any Ramsey receiver.
•
Power switch cuts the AA7 active antenna in and out of the antenna
line with no need to change cables.
•
Runs on a standard 9 volt battery!
HF, VHF, UHF
AA7
•
1
AA7
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Related Manuals for Ramsey Electronics AA7
Summary of Contents for Ramsey Electronics AA7
- Page 1 - enhances resale value, too! • Ideal companion to any Ramsey receiver. • Power switch cuts the AA7 active antenna in and out of the antenna line with no need to change cables. • Runs on a standard 9 volt battery! HF, VHF, UHF •...
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Page 2: Aa7 Active Antenna
1994 by Ramsey Electronics, Inc. 590 Fishers Station Drive, Victor, New York 14564. All rights reserved. No portion of this publication may be copied or duplicated without the written permission of Ramsey Electronics, Inc. Printed in the United States of America. First printing: August, 1994... -
Page 3: Table Of Contents
KIT ASSEMBLY AND INSTRUCTION MANUAL FOR AA7 ACTIVE ANTENNA KIT TABLE OF CONTENTS Introduction to the AA7 ... 4 Circuit and Device Description ... 4 Active Antennas: Circuits With a Purpose ... 5 Parts List ... 6 Assembly Instructions ... 7 Schematic Diagram ... -
Page 4: Introduction To The Aa7
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. -
Page 5: Active Antennas: Circuits With A Purpose
VHF- UHF region (Wavelength [ft.] = 234/ f [MHz] - terribly long for a baked potato), this mode of the AA7 is ideal for indoor, outdoor and portable use of VHF scanners and other receivers. -
Page 6: Parts List
"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 100 pF disc capacitor (marked 100 or 101) [C3] .01 µF disc capacitor (marked .01, 103 or 10nF) [C1, C2, C5, C6]... -
Page 7: Assembly Instructions
Because the AA7 is of great interest to people who simply enjoy shortwave listening and VHF monitoring, experienced ham operators should understand that our instructions are addressed to people for whom this may be their very first electronic kit project. - Page 8 •...
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Page 9: Parts Layout Diagram
AA7 PARTS LAYOUT DIAGRAM •... - Page 10 PC-board solder connections. Soldering the AA7 Printed Circuit Board 1. Install J1, the RF input jack. Notice that it is connected directly to the screw hole for the extendable whip antenna. Solder all 4 points of the jack secure! 2.
- Page 11 14. Install R3, 100K [brown-black-yellow]. 15. If you have completed Steps 4 through 14 correctly, you now have the 4 holes for Q1 surrounded by other parts, making it easy to find! Examine Q1, the dual-gate MOSFET. The schematic diagram shows why it has 4 leads.
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Page 12: Initial Tests
AA7 and your receiver as well as an optional add-on antenna. Testing the AA7 consists of turning it on, using it and checking that all its described features are operational. You will need to become accustomed to the signal strength in the highest range of the gain control. -
Page 13: Troubleshooting Guide
Strong AC hum in the HF setting: The antenna is too close to an AC cord or power line, and/or the RF gain is set too high. HF signals stronger at VHF than at HF setting: As explained in the AA7 circuit description, either preamp may be used for HF. Signal strength will be greater with the VHF preamp, but the HF signal-to-noise ratio should be better with the dual gate MOSFET HF section. -
Page 14: Active Antenna Comparisons
The Ramsey Electronics custom case, panel and knob kit is optional for the AA7 as it is for all of our standard major PC-board kits. In it’s case, the finished AA7 will be attractive and virtually indestructible, so that the world of radio can be at your fingertips wherever you go. -
Page 15: Ramsey Kit Warranty
But on rare occasion a sour component can slip through. All our kit parts carry the Ramsey Electronics Warranty that they are free from defects for a full ninety (90) days from the date of purchase. Defective parts will be replaced promptly at our expense. If you suspect any part to be defective, please mail it to our factory for testing and replacement. -
Page 16: Victor, New York
Technician’s Tool Kit (TK405) • Desoldering Braid (RTS08) Manual Price Only: $5.00 Ramsey Publication No. MAA7 Assembly and Instruction manual for: RAMSEY MODEL NO. AA7 ACTIVE ANTENNA KIT RAMSEY ELECTRONICS, INC. 590 Fishers Station Drive Victor, New York 14564 Phone (585) 924-4560 (585) 924-4555 www.ramseykits.com...