Phase 9
TX Sample and Hold Modulator
In this phase populate area on the top right and bottom right part of PCB.
Phase is divided in two sub-phases, as shown below.
Phase 9A:
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Click Picture to Enlarge
Phase 9B:
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Once the components have been installed, install the connecting wire W8 as shown in the connection diagram above.
Do not apply +V yet.
TX I/Q adjustment
Adjust serial resistance of 5K trimmer (Point A) and 1K resistor (Point B) to 3.3K when G3020 is turned off and G3020 isn’t connected to sound card output!
Phase 10
TX driver and power FET assembly
Click Picture to Enlarge
- Install All Components, Except FET and Transformer
- Wind and Install the Dual Binocular Transformer
- Install FET and Heat Sink
- Install two Jump Wires
Wind and Install the Dual Binocular Transformer
Cores
Glue together the two binary cores as indicated in the graphic, below:
Twisted Wire
Prepare a 40 cm (~16") long piece of enameled copper wire and fold it over so that it is two 20 cm wires joined at the one end
Twist the wires together so that you get approximately three twists per 10mm of length
For more details, see www.genesisradio.com.au/G40/8assemblyG40.html
Wind the Wire through the Core
Click Picture to Enlarge
Thread the twisted wires (folded end first) through the glued cores, starting in hole 1, coming out the other end and looping back through the top core to exit at hole 3. Continue from hole 3 into hole 2, coming out the other end and looping back into the upper core so as to exit at hole 4.
When finished winding, cut the folded end of the twisted wire off, such that you noe have four wire ends.
The pair at hole 1 represents the primary leads; the pair at hole 4 represents the secondary leads of the wound transformer.
Using an ohm meter, identify the ends of each wire as indicated on the graphic above. You may want to use a small piece of colored hookup wire insulation to identify the "a" (or, if you prefer, the "b") wire's ends.
Mount the Transformer
You do not need to worry how to figure out the phasing; if you match the designated leads (a1, b1, a, b) with the holes as marked in the graphic below, you will have correct phasing.
Insert transformer's leads into the PCB holes, as indicated above. Form the leads and pull them tight. Then cut off the excess (on the underside of the board) so that approximately 5mm (1/8") of wire is protruding out on the underside of the board.
Remove the transformer from the PCB, scrape the enamel coating from the 4 leads but DO NOT TIN them as yet (tinning the leads could cause them to be too "fat" to go back into the holes).
Insert the 4 transformer leads back into the PCB and solder them.
Final Assembly Diagram
Click Picture to Enlarge
Trimmer Adjustment
Click Picture to Enlarge
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G3020
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30m+20m/ 5W Transceiver KIT.
Includes professionally manufactured double layer PCB and all components. Online assembly help file. Yahoo Group support.
Delivery status: IN STOCK
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