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AA7

 

  

12

 

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24. BEFORE connecting battery or conducting any tests, PLEASE  
recheck each of the preceding steps, looking especially for: 

quality of solder connections 

correct orientation of Q1 and Q2 

correct orientation of the electrolytic C4 

correct battery wire polarity 

correct values for resistors and capacitors 

 

INITIAL TESTS 

 

   No adjustments or alignment is required. See the following section about 
preparing a reliable and convenient cable for the 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. If you experience 
any problem, consult the Trouble-Shooting Hints section of this book. 
 

USING YOUR AA7

 

 

   For some of our kits, this "USING...." section becomes the longest part of 
the book, depending on the possible applications of the kit product. What is 
very nice about the AA7 is that using it is simple, enjoyable and immediate.   
We have two suggestions that will increase your enjoyment of the AA7 right 
from the beginning: 
 

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1. Prepare a reliable coaxial cable with the right connectors to run  from 
the antenna input of your receiver or scanner to the RF output of the   
AA7 (RCA male plug required).  If  you do not have them at hand, a visit 
to  Radio Shack should easily get you what you need. 

 

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2. Make a simple "supplementary portable antenna" of any design  which 
is practical for YOU.  Use a small-diameter coaxial cable  neatly 
terminated in a male RCA male plug to mate J1. This antenna can  be a 
dipole, or random wire with earth ground or counterpoise, a  bigger 
vertical whip of some kind, a Slinky, or even a pair of  alligator clips at the 
end of your coax line, ready to be clipped to  any large metal surface that 
may be handy, from screen doors to  bed springs! This accessory for 
your AA7 will help you explore  the truth of "Ramsey's Antenna Rule" in a 
variety of travel  situations: "If you want more signal, put up more metal!” 

 
A Caution to Ham, Maritime and CB Operators:

 

 

   If you are using the AA7 to boost reception on a transceiver of any kind, 

Summary of Contents for AA7

Page 1: ...ludes internal telescopic whip antenna plus auxiliary antenna input jack for jazzing up existing antennas Clear concise assembly instructions carefully guide you to a finished kit that works FIRST tim...

Page 2: ...wave Motion Detector ML Music Lights Kit LC1 Inductance Capacitance Meter RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer QRP Power Amplifiers RAMS...

Page 3: ...pose 5 Parts List 6 Assembly Instructions 7 Schematic Diagram 8 Parts Layout Diagram 9 Initial Tests 12 Using your AA7 12 Troubleshooting Guide 13 Active Antenna Comparisons 14 The AA7 s Enclosure 14...

Page 4: ...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 id...

Page 5: ...r hooked to a piece of wire The AA7 was designed with reference to research carried out by Ulrich L Rohde and T T N Bucher who co authored Communications Receivers Principals and Design New York McGra...

Page 6: ...7 F to 10 uF electrolytic capacitor C4 RESISTORS 1 100 ohm brown black brown R4 2 100K ohm brown black yellow R3 R6 1 220K ohm red red yellow R2 1 1M ohm brown black green R1 1 10K ohm PC mount poten...

Page 7: ...solder A cardboard box cut so that it is flat tends to work well if you do not have such a surface conveniently available Always use caution operating and storing a hot soldering iron We like to live...

Page 8: ...AA7 8...

Page 9: ...AA7 9 AA7 PARTS LAYOUT DIAGRAM...

Page 10: ...nstall R6 100K brown black yellow next to C3 NOTE Save the extra wires nipped away from C3 R6 and similar parts You will use them to make jumper wires 5 Notice that Q2 the 2SC2498 transistor is instal...

Page 11: ...ts the antenna jack J1 and the receiver jack J2 directly together when in the turned off position Solder all six points of the switch 20 Install receiver jack J2 Solder all four points of the jack 21...

Page 12: ...nice about the AA7 is that using it is simple enjoyable and immediate We have two suggestions that will increase your enjoyment of the AA7 right from the beginning 1 Prepare a reliable coaxial cable w...

Page 13: ...current limiting resistor of about 1K ohm to the closest PC board ground point Note This can be locations such as the black wire of the battery the mounting case of either jack but it CANNOT be the an...

Page 14: ...hs of the other units resulted in increased signal strength It becomes a question of how much you wish to pay for the shortest possible indoor antenna The AA7 s competition performs well but we are su...

Page 15: ...g part problem If you re missing five 10K ohm resistors and received five extra 1K resistors you can pretty much be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I gues...

Page 16: ...00 Ramsey Publication No MAA7 Assembly and Instruction manual for RAMSEY MODEL NO AA7 ACTIVE ANTENNA KIT REQUIRED TOOLS Soldering Iron WLC100 Thin Rosin Core Solder RTS12 Needle Nose Pliers MPP4 or R...

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