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MagicBox V1R2B, Assembly Manual

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MagicBox V1R2B Assembly Manual Download Page 2

The next pages contain an image of the supplied printed circuit board and the schematics for the 
system.

2

Summary of Contents for V1R2B

Page 1: ...transmitters It supports full QSK CW up to about 50 WPM And a non QSK mode is also provided for those who don t like QSK CW There are five pieces of functionality within the system First is a keying c...

Page 2: ...The next pages contain an image of the supplied printed circuit board and the schematics for the system 2...

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Page 5: ...his will assist you later on if you have parts left over and wonder where they were supposed to go Connectors and Headers Start construction by installing Power Jack J1 Hold this part toward the rear...

Page 6: ...d R44 Install 470 Ohm Yellow Violet Brown resistors at R3 R4 R14 R18 R35 R40 R42 R47 and R48 Install 4 7K Ohm Yellow Violet Red resistors at R1 R2 R7 R8 R9 R11 R13 R15 next to R18 R16 R17 R20 R21 R22...

Page 7: ...C27 Note the polarity marking on these capacitors they need to be installed with this matching the on the PCB Install 22 uF black color marked 22uF capacitors at C2 C3 C4 C17 and C28 Note the polarity...

Page 8: ...Your PCB should now look like this 8...

Page 9: ...n molded inductors at L1 L3 and L4 These look a bit like fat 1 4 watt resistors Wind and install transformers T1 and T2 The Winding T1 and T2 page contains notes on winding these transformers along wi...

Page 10: ...Install the 1N459A black body marked 1N459A diode at D2 Save one lead from this diode so that it can be used as a jumper on the IC socket U1 later on in a testing stage Install the 1N4007 black body m...

Page 11: ...shunt on header J14 Apply 12 15 volts DC to J1 and check that the left pad of R1 is at 5 volts and the left pad of R25 is at 10 volts A variation of 0 25 volts is acceptable for each measurement Writ...

Page 12: ...er or headphones into J5 Apply power to J1 and confirm that a 700 Hz tone from the side tone oscillator is coming out of the speaker This is a test of the audio muting switch when using the side tone...

Page 13: ...or is away from the 1 8 inch audio jacks as shown on the PCB overlay Your PCB should now look like this Integrated Circuits Install the ATtiny2313 chip Make sure that it is oriented to match the socke...

Page 14: ...nes jack J6 Apply power to the MagicBox Turn on the receiver and confirm that receive audio is coming out of the speaker headphones Press the key and confirm that the audio signal from the receiver is...

Page 15: ...e the dummy load with a suitable antenna and try the system on the air Confirm that the receiver is being muted except for the side tone and the transmitter is keying properly Write down your results...

Page 16: ...plug on the MagicBox end with the ground on the ring terminal and the signal lead on the tip terminal The J5 and J6 jacks should have their mounting barrels insulated from chassis ground with a 1 16...

Page 17: ...n be implemented in a variety of ways A single DPDT ON Off ON toggle switch used on my prototype could be used with the upper contacts used for the J7 connections and the lower contacts used for the J...

Page 18: ...ver Input Isolation Greater than 25 dB 1 8 28 MHz Transmit Mode Maximum transmit power Less than 10 watts Transmitter Output to Antenna Loss Less than 0 25 dB 1 8 28 MHz Antenna to Receiver Input Isol...

Page 19: ...Bill of Material 19...

Page 20: ...where the two leads exit you should see two wires as shown in the next photo Next we have to add the 4 turn primary winding This starts with a 5 inch piece of 28 wire On the opposite end of the core...

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