| Article Index |
|---|
| ATS 1 20m SSB CW Transceiver Construction: An Introduction |
| VFO and Band Operation |
| Notes - Before You Begin |
| Assembling the PCB |
| All Pages |
Page 4 of 4
ASSEMBLING THE PCB:- First fix four 4mm X 25mm (or nearby size) screws in the four, mounting holes in the four corners of the PCB so that when tne PCB is placed on the Hat table, its Jrack and solder side is about 25mm (1 ") above the table surface. This is done so that when you apply power to the PCB for testing during assembling, there is no danger of any short circuit because of any lose wire pieces or components which might be lying on the table surface.
- Fix all the wire links on the PCB using about 18 SWG good quality insulated copper wire. All wire links on the PCB are marked with thin white continuous lines. First cut a peace of wire about 2.5 c.m. longer than the link length, solder one end of the wire, then pass the wire through the hole at the other end of the link then lightly pull the wire tight with a nose plier and solder in place. Do not stretch the wire to much otherwise it may break, stretch just sufficient to remove slack and kinks if any.
- Solder the four power rectifier diodes D29 to 032. Be careful about the polarity of the diodes.
- Solder all IN4148 diodes. Be careful about the polarity of the diodes.
- Starting from R1 solder all the resistances but check all the resistance with a multimeter before soldering.
- Solder all the variable preset resistances. Check all the variable presets with a multimeter before soldering.
- Solder all the non polar capacitors starting form C1, i.e. all the disc ceramic and Polystyrene capacitors.
- Solder all the trimmers.
- Solder the two PCB Relays.
- Solder PCB pins an all the terminal point on the PCB on which inter connecting wires or coaxial cables are to be soldered.
- Solder all the electrolytic capacitors, be careful about polarity.
- Solder all the IFTs, RFchocks, and inductors in the receiver portion.
Note: After soldering each components, carefully check the soldered joints for short circuits, solder bridges or dry solders. Correct if defective.
Before soldering any resistances on the PCB, first check it with a multimeter. Sometimes good looking resistances have breaks in the thin resistance film. Similarly check all the diodes and
capacitors etc. before soldering.
The chocks and ferrite transformers of the TX section will be soldered after the receiver is functional.
The active components are to be soldered section by section and each section has to be made functional one by one.
