Elenco Electronics AR-2N6K Assembly And Instruction Manual Download Page 1

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FM RECEIVER KIT

MODEL AR-2N6K

Assembly and Instruction Manual

Elenco

Electronics, Inc.

Electronics, Inc.

Revised 2003 REV-D 753001

Summary of Contents for AR-2N6K

Page 2: ...03 241031 1 C22 047 F 80 20 50V 473 244780 6 C3 C4 C9 1 F 80 20 50V 104 251010 C18 C19 C20 2 C14 C21 4 7 F 50V Radial 4 7 F 50V 264747 1 C15 220 F 16V Radial 220 F 16V 282244 SEMICONDUCTORS Qty Symbol...

Page 3: ...speaker Block 1 The AR 2N6 is a dual conversion narrow band FM radio receiver designed to detect signals in the 2 meter and 6 meter bands Why Convert Twice In the attempt to obtain the desired interm...

Page 4: ...row Band Wide Bandwidth 3kHz 200kHz 2 Meter Band If the speed of a wave meters per second is divided by the number of waves that pass a given point cycles per second the seconds cancel and you obtain...

Page 5: ...5026 C 0 00019896 or C 200 F 220 F used Due to the high input resistance of the amplifier 50k the audio coupling capacitor C3 can be as small as 0 1 F The equivalent resistance at the junction of R8 a...

Page 6: ...circuits U2 and U3 5 C3 1 F Capacitor C4 1 F Capacitor 104 Insert the IC socket into the PC board with the notch in the same direction as the marking on the PC board Insert the LM 386 IC into the IC s...

Page 7: ...hown in Figure 8a Solder the wires close to the components and clip off any excess wire Mount the components shown in Figure 8 to the foil side of the PC board Place a check mark in the box after each...

Page 8: ...ach end Before soldering mechanically connect the wire to the parts as shown in the figure For the jumper wire cut 2 of 22 gauge solid wire strip 1 4 of insulation off of each end and solder to the po...

Page 9: ...tor and multimeter as shown in Figure 11 Turn the volume control fully clockwise maximum gain Put the multimeter in the AC 20V position turn the generator to minimum at 400Hz sine wave output and turn...

Page 10: ...ading __________________ The power output before clipping is equal to the square of the rms voltage across the speaker divided by the speaker impedance The rms voltage for a sine wave is equal to the...

Page 11: ...peaker may go higher than the original value due to speaker resonance The frequency at which a speaker resonates changes with speaker size mounting method and speaker enclosure The bandwidth of your a...

Page 12: ...bandwidth 6 The first IF frequency in the AR 2N6 Radio Kit is a 455kHz b 10 7MHz c 150MHz d 50MHz 7 In order to get the second IF frequency a crystal oscillator must be set at a 455kHz c 10 7MHz b 54...

Page 13: ...limiter The limiter removes the affects of fading driving through a tunnel and impulse noise lightning and ignition These affects produce significant unwanted amplitude variations in the received sig...

Page 14: ...the frequency increases above the carrier frequency positive deviation the phase shift increases causing a decrease in the width of the gated impulse output see Figure 17b In a similar manner when ne...

Page 15: ...ischarge when handling the integrated circuit U1 14 C18 1 F Capacitor C19 1 F Capacitor C20 1 F Capacitor 104 R11 10k Resistor brown black orange gold R1 68k Resistor blue gray orange gold Remove this...

Page 16: ...er VR1 to the PC board and put a check mark in the box after both wires are in place This part should be similar to the sketch shown in the box but may differ in size Be sure to mechanically connect e...

Page 17: ...and connect to the circuit as shown in Figure 20 Connect the positive voltage probe to pin 12 of the integrated circuit U1 Connect the common probe to the negative lead from the battery Turn the powe...

Page 18: ...timeter should read approximately 2 4V Turn L5 slowly clockwise The multimeter voltage should rise to a maximum of about 3 0V then fall to a minimum of about 1 5V and then rise again Record the maximu...

Page 19: ...y jumper installed in block 1 was removed Procedure 4 If you do not have test equipment it is possible to check block 2 with the following procedure 1 Make sure that the ON OFF switch is in the OFF po...

Page 20: ...coil in the quadrature detector is used to produce a DC voltage b phase shift c frequency shift d amplitude peaking Answers 1 b 2 c 3 a 4 d 5 a 6 d 7 d 8 b 9 a 10 b BLOCKS 3 4 CONVERTING TO 455kHz The...

Page 21: ...in each box but will differ in size Be sure to check each solder point for shorts and cold solder connections C9 1 F Capacitor 104 104 F2 10 7MHz Filter Ignore polarity markings either direction Figu...

Page 22: ...or 3 9 C17 51pF Capacitor 51K C1 120pF Capacitor 121 C12 68pF Capacitor 68 C6 33pF Capacitor 33 R9 0 Jumper Wire Use a discarded resistor lead R10 1k Resistor brown black red gold R4 R6 4 7k Resistor...

Page 23: ...sure to mechanically each wire as shown in the figure below before soldering L1 4 turn Coil Make a good mechanical connection before soldering Antenna Wire Strip both ends of the shielded cable as sho...

Page 24: ...tor to the phono jack terminal and shield to the GND terminal Peel the backing off of one side of the 1 2 wide double sided tape and stick it to the battery clamp as shown in Figure 31 Peel the backin...

Page 25: ...24 Lockwasher Figure 27 Speaker 4 40 Nut 4 40 Nuts Phono Jack Nut 4 Lockwashers Ground Terminal 4 Lockwasher L Brackets L Bracket 4 40 Screws black Phono Jack Figure 28 Figure 29...

Page 26: ...Nuts Flat Washers 2 56 Screws 7mm Hex Nut Large Tuning Knob Volume Knob Squelch Knob On Off Switch 2 56 Nuts Squelch Pot Volume Pot 100k 2 56 Nuts Tuning Pot 5k 5 16 Internal Tooth Lockwashers 2M 6M S...

Page 27: ...g range If the range is too low decrease L4 by spreading the turns If the range is too high substitute the 39pF capacitor with the 33pF capacitor in C6 Then repeat both procedures to determine the upp...

Page 28: ...ElencoTM Electronics Inc 150 W Carpenter Avenue Wheeling IL 60090 847 541 3800 Fax 847 520 0085 http www elenco com e mail elenco elenco com SCHEMATIC DIAGRAM...

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