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Ramsey Electronics AR2WT, Manual

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Ramsey Electronics AR2WT Manual Download Page 21

AR2 

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 21  

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Summary of Contents for AR2WT

Page 1: ...control towers centers and planes en route Very sensitive picks up planes 100 miles away Great project for all pilots and flight students Clear concise step by step instructions carefully guide you t...

Page 2: ...Meter LC1 Inductance Capacitance Meter RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers DDF1 Doppler Direction Finder Kit QRP Series HF CW Transmitters CW7 CW Keyer QRP Power Amplifiers RAMS...

Page 3: ...No AR2 Manual Price Only 5 00 TABLE OF CONTENTS Introduction 4 What You Can Expect to Hear 4 Circuit Description 8 Block Diagram 10 AR2 Schematic Centerfold 12 Antenna Considerations 16 Modes of Opera...

Page 4: ...l hear any aircraft you can see PLUS planes up to 100 miles away and more since VHF signals travel line of sight An airliner at 35 000 feet altitude is still line of sight to your antenna Similarly wh...

Page 5: ...pilot on the status of incoming or outgoing aircraft but the pilot remains responsible for landing and takeoff decisions Typical CTAF frequencies are 122 7 122 8 and 123 0 MHz Unicom frequencies are u...

Page 6: ...a cleared to outer marker Contact Tower 118 7 The local Approach Control is saying that the Piper Seneca with the N number tail number ending in 432L is cleared to continue flying an instrument approa...

Page 7: ...AR2 7...

Page 8: ...will have two different frequencies on the inputs which results in four signals on the output The received frequency is connected to one input and the local oscillator or LO is supplied to the other...

Page 9: ...The band pass filter certainly helps and gets rid of all but the strongest image signals outside the band Now that we have our filtered 10 7MHz IF at the output of the IF filter we can do some simple...

Page 10: ...rence 10 25MHz Vtune VCO 118 139MHz 118 139MHz 10 7MHz 450kHz Audio Detector IC Simplified Display Control RSSI IF1 Mixer IF2 Mixer IF AMP RF Amp Detector Antenna Speaker A B C D E F G H Audio Amp I J...

Page 11: ...can be tuned using what is called a varactor diode in the oscillator section A varactor diode is a reverse biased diode that changes capacitance according to the reverse voltage The higher the voltag...

Page 12: ...AR2 12...

Page 13: ...AR2 13...

Page 14: ...a C value of 410 This means the reference clock of 10 25MHz is divided by 410 to give a divider output of 25kHz This value remains constant throughout the AR2 circuit To receive 118 3MHz we have to s...

Page 15: ...is device programs the PLL to get the frequencies desired handles the jog dial by interpreting it s pulses and then writes the data to the displays Quite a bit of coding is required to handle the scan...

Page 16: ...action from the wire but if you re more than a few miles away a decent roof mount job is the way to go A low cost TV antenna works well even better if rotated 90 degrees remember aircraft antennas are...

Page 17: ...eld strength of the signal RSSI 2 Lighting Control Mode This mode allows a user to access an external circuit to remotely control runway lights in small airports by keying the radio at the frequency t...

Page 18: ...te frequency memories from scanner 3 16 Setup Scanner 4 Mode Allows you to save and delete frequency memories from scanner 4 17 Setup skip timer Allows you to select the amount of time to keep a parti...

Page 19: ...uency is already in the list a sign will appear in the lower right to indicate it is already in the list if it is not Press and release the jog dial to add a frequency not in the list Press and releas...

Page 20: ...opinions comments and additions you d like to see in future publications Please submit comments or ideas to Ramsey Electronics Inc or email us at techsupport ramseymail com Attn Hobby Kit Department...

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Page 23: ...nd 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 guess the red band really does look orange Ramsey Electronics...

Page 24: ...n Expect to Hear 4 Circuit Description 8 Block Diagram 10 AR2 Schematic Centerfold 12 Antenna Considerations 16 Modes of Operation 17 Warranty 35 Manual Price Only 5 00 Ramsey Publication No AR2 Assem...

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