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Ramsey Electronics AR2 Instruction Manual

Manual is about: AIRCRAFT RECEIVER

Summary of AR2

  • Page 1

    Ar2 • 1 aircraft receiver kit ramsey electronics model no. Ar2 • tunes the entire 118 - 136 mhz air band • operates on 12 to 15 vdc • scan function “finds” the signals for you; no more laborious tuning to find a transmission • memory locations make it easy to refind your local favorites • listen to ...

  • Page 2

    Ar2 • 2 partial list of available kits: ramsey transmitter kits • fm10a, fm25b, fm30, fm stereo transmitters • fm100b, fm35 professional fm stereo transmitters • am1, am25 am broadcast band transmitters ramsey receiver kits • fr1 fm broadcast receiver • ar1 aircraft band receiver • sr2 shortwave rec...

  • Page 3: Aircraft Receiver

    Ar2 • 3 aircraft receiver ramsey publication no. Ar2 manual price only $5.00 table of contents introduction ..........................................4 what you can expect to hear ............4 circuit description................................8 block diagram ...................................11 a...

  • Page 4

    Ar2 • 4 introduction to the ar2 aviation receiver kit the ramsey ar2 aviation receiver is a new design of our original ramsey ar1 aircraft receiver. The ar1 has been built and loved for years by hobbyists with an interest in both aviation and electronics. The ar2 design takes the best of the ar1 and...

  • Page 5

    Ar2 • 5 atis – automated terminal information system atis, is a repeated broadcast about basic weather information, runways in use, and any special information such as closed taxiways or runways. Asos/awos – automated surface observing system/automated weather observing system this system is similar...

  • Page 6

    Ar2 • 6 routed via computers to the proper company, relieving some of the necessity for routine voice communication. With acars, routine items such as departure reports, arrival reports, passenger loads, fuel data, engine performance data, and more can be retrieved from the aircraft at automatic int...

  • Page 7

    Ar2 • 7.

  • Page 8

    Ar2 • 8 circuit description radio basics: we’ll take the circuit section by section; the letters show which part of the block diagram we’re explaining in each section. The ar2 is a simple super-heterodyne receiver. A heterodyne receiver is a receiver that first converts the desired received frequenc...

  • Page 9

    Ar2 • 9 have to be set at 118.300 mhz + 10.700 mhz or 129.000mhz. It would then be sent to the mixer and on the output there would be 129.000mhz (lo), 118.3mhz(fr), 247.3mhz(sum) and 10.700mhz (if). (see figure 1) after the mixer we use a narrow-band filter (e) to reject everything but the 10.7mhz i...

  • Page 10

    Ar2 • 10 since the ar2 is a relatively complex (and educational!) product, it’s easiest to show you how things work by using a block diagram and explaining the different sections. This is a simplified block diagram, but is suitable for our needs. Block a. Rf band pass pre-filter. This is one of the ...

  • Page 11

    Ar2 • 11 pl l mi cro - co nt ro lle r 10 .2 5m h z re fe re n ce 10 .2 5m h z vtu n e vc o 118 -139 m h z 11 8-139 m h z 10 .7 m h z 450k h z aud io det ec tor ic ( s imp lif ie d ) d isp la y /c ont ro l rssi if 1 m ixe r if 2 m ix er if a m p rf am p d etecto r ant en n a sp eak er a b c d e f g h...

  • Page 12

    Ar2 • 12 block g. This is the main detector, agc, 2nd lo, reference oscillator, and filtering all wrapped into one part. Block h. 2nd if filtering. This section is for further attenuating adjacent signals. The goal is to reduce signals 25khz away more than 90db, or the range of the agc of the detect...

  • Page 13

    Ar2 • 13 being “imposed” on the vco. It also provides some amplification to give the vco 0-12v of tuning from a 5v pll part. Block k. The microcontroller is the “brains” of the entire project. This device programs the pll to get the frequencies desired, handles the jog dial by interpreting it’s puls...

  • Page 14

    Ar2 • 14 ar2 parts list: capacitors 2 3.3 pf ceramic capacitors [marked 3.3] (c25,28) 1 5 pf ceramic capacitor [marked 5] (c23) 1 10 pf ceramic capacitor (c32) 2 22 pf ceramic capacitors(c24,38) 1 56 pf ceramic capacitor (c63) 1 62 pf ceramic capacitor (c54) 4 82 pf ceramic capacitors (c30,31,33,34)...

  • Page 15

    Ar2 • 15 semiconductors 1 1n4000 series diode [any value from 1n4000 to 1n4007] (d1) 1 2sc2570a npn uhf transistor (q1) 2 2n3904 npn transistors (q2,3) 1 lm7812 12 volt regulator (vr1) 1 78l05 5 volt regulator [looks like a transistor, marked 78l05] (vr2) 1 bb505 varactor diode [marked bb505. Orange...

  • Page 16

    Ar2 • 16 assembly instructions in all pc board assembly steps, our word "install" means to do this: • insert the part, oriented or "pointed" correctly, into its holes in the pc board. • if helpful, gently bend the part's wire leads or tabs to hold it into place, with the body of the part snugly agai...

  • Page 17

    Ar2 • 17 8. Install c12, another 1nf disc capacitor (marked .001 or 102). This part also needs to be mounted on the opposite side of the pc board. 9. Install j6, one of the 8 pin dual row connectors. This part is placed from the back of the board, the side you’ve been soldering so far. The short pin...

  • Page 18

    Ar2 • 18 schematic centerfold.

  • Page 19

    Ar2 • 19.

  • Page 20

    Ar2 • 20 progress is not a bad thing and when you come back you'll have fresh eyes and renewed vigor to finish. Hey, we all like to take frequent breaks here at the factory . . . But management isn’t as kind to us as you can be to yourself! 14. Install u6, one of the lmc6482ain ics. It’s located nea...

  • Page 21

    Ar2 • 21 now we’ll start installing the other components, starting at the front of the pc board and working our way around. This will make it easier to find the parts you’re placing. There’s no polarity on the disc capacitors or resistors. You can make the board look more professional by having all ...

  • Page 22

    Ar2 • 22 with the number on it and you’ll see the outline showing where to place this flat side on the pc board silkscreen. Bend the center lead out to fit in the holes and push the part down close the circuit board without forcing. Solder the transistor. 34. Install r12, 47k standup ohm resistor (y...

  • Page 23

    Ar2 • 23 three leads. 56. Install c48, 35 pf trimmer capacitor (round red part with adjustment). This part can be installed either way. 57. Install c54, 62 pf ceramic capacitor (marked 62). 58. Install r18, 22k ohm standup resistor (red-red-orange). The silkscreen for this part is hard to see but yo...

  • Page 24

    Ar2 • 24 76. Install c28, 3.3 pf ceramic capacitor (marked 3.3). 77. Install l2, an 11 turn air coil. 78. Install c33, 82 pf ceramic capacitor (marked 82). 79. Install c27, 1nf disc capacitor (marked .001 or 102). 80. Install c55, 1nf disc capacitor (marked .001 or 102). 81. Install c50, 10 µf elect...

  • Page 25

    Ar2 • 25 97. Install vr1, the lm7812 12 volt regulator. The hole in the large metal part of the regulator is there so that you can attach the part to the board with a screw and nut. This provides a better heatsink for the regulator. Bend the leads down so that the part can lay flat on the circuit bo...

  • Page 26

    Ar2 • 26 116. Install r36, 2.7k ohm resistor (red-violet-red). 117. Install c65, 1nf disc capacitor (marked .001 or 102). 118. Install r37, 10k ohm resistor (brown-black-orange). 119. Install c58, 2.2 µf electrolytic capacitor. Remember polarity! 120. Install c59, the other 2.2 µf electrolytic capac...

  • Page 27

    Ar2 • 27 now we’ll install some of the larger connectors and parts, then we’ll be ready for a final checkout of our assembly. And then . . . The moment of truth, applying power to your kit. 137. Install j7, bnc pc mount jack. Be sure the part is flat on the pc board before soldering. That will ensur...

  • Page 28

    Ar2 • 28 and matching 1-64 hex nuts. Place the speaker into its position on the backside of the front panel between the power and squelch knobs with the speaker wires going up toward the top of the case. They’re going to loop over the front panel when we connect it later. Attach the speaker to the f...

  • Page 29

    Ar2 • 29 sure they’re oriented correctly using the dot or notch on the part and the notch marked on the pc board. Then take a look at all of the electrolytics to be sure they’re installed in the right way. Better to take a few minutes now than to have a part damaged or destroyed because you’re in a ...

  • Page 30

    Ar2 • 30 here’s where we separate the folks with test equipment from the folks who don’t have any. Either way your ar2 will receive the entire aircraft band quite nicely but if you’ve spent money on a signal generator we’re pretty sure you want to get some use out of it. Regular tuning mode: without...

  • Page 31

    Ar2 • 31 the ar2 uses an advanced way to access the many useful features built in to the unit. What looks like a volume control at first glance is actually a jog dial. No, it doesn’t go for a jog at the end of a long work day, instead it allows you to enter values digitally in a convenient way. Ther...

  • Page 32

    Ar2 • 32 10. Skip scanner 2 mode. This mode allows you to scan up to 20 frequencies saved in the scanner 2 setup mode, only this will automatically skip to the next frequency after a specified time. 11. Skip scanner 3 mode. This mode allows you to scan up to 20 frequencies saved in the scanner 3 set...

  • Page 33

    Ar2 • 33 standard scanner modes 1-4 and skip modes: use the jog dial to select a frequency other than what is currently running. Press and release the jog dial to skip to the next active memory press and hold the jog dial to prevent stopping at this frequency for the duration of the selection of thi...

  • Page 34

    Ar2 • 34 troubleshooting hopefully you’ll never need this section! If you have a problem with your kit, don’t panic. A sensible, logical approach and a clear head will usually point you to your trouble spot. The first thing to do is to look over the board again and check to be sure that: • all parts...

  • Page 35

    Ar2 • 35 the ramsey kit warranty please read carefully before calling or writing in about your kit. Most problems can be solved without contacting the factory. Notice that this is not a "fine print" warranty. We want you to understand your rights and ours too! All ramsey kits will work if assembled ...

  • Page 36: Table of Contents

    Ar2 • 36 table of contents introduction ..........................................4 what you can expect to hear.............4 circuit description ................................8 block diagram................................... 11 ar2 parts list ................................... 14 assembly instr...