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Block Diagram | Phase 1: Power Supply | Phase 2: Microcontroller circuit | Phase 3: Local osciallator Si570 |
Phase 4: G59 USB connection
| Phase 5: G59 Receiver assembly | Phase 6: G59 Input-Output HP-LP Filters |
Phase 7: Band pass filters and control logic | Phase 8: CW monitor | Phase 9: Transmitter circuits assembly |
Phase 10: Microphone preamplifier | Phase 11: Si570 Quasi oven circuit | Phase 12: G59 Receiver Image Calibrator | GBOX assembly

Phase 11: Si570 Quasi oven circuit

The components in this phase are marked with letter H in suffix.

For schmematic diagram and component list refer to Assembly manual which is enclosed with your kit.

Assembly of oven circuit

Schematic diagram
Click Picture to Enlarge
Transceiver Interconnection

Component placement

Click Picture to Enlarge
Transceiver Interconnection


Install resistors R1H, R2H, R4H, R5H, R6H, R7H, R8H, R9H and R10H.
Install diode D1H.





Install capacitors C1H, C2H, R1H, C3H, C4H, C5H and C6H.
Install integral circuit IC2H.





Installation of TR1H

Bend the leads of TR1H as per photo.




Insert TR1H over the Si570. Make sure that TR1H heatsink is completely covering top surface of Si570. Solder it and then bend the TR1H pins very gently downwards to ensure good thermal contact.




Installation of IC1H
Bend the leads of IC1H as per photo. Apply a bit of glue on top of the flat side.





Position IC1H as per photo and glue it to heatsink of TR1H. Do not solder IC1H until glue sets firmly. Once the glue is dry and set, press both IC1H and TR1H downwards so that heatsink of TR1H has good thermal contact with Si570. Finally, solder the pins of IC1H.

Warning: do not apply any glue between TR1H and Si570.





Install jumper KS1H.




Adjustment
Adjust trimmer R3H so the voltage on pin 5 of IC2H is exactly 3.28 V.
After the adjustment check the voltage on pin 3. The voltage on pin 3 will be around 3.10 V and if the quasi oven is installed properly the voltage will slowly rise at rate of 0.02 V per minute until it reaches 3.28 V. At that point the temperature of Si570 will stabilize at 55C Celsius [131 Fahrenheit].





This completes the installation of Si570 quasi oven circuit.

Block Diagram | Phase 1: Power Supply | Phase 2: Microcontroller circuit | Phase 3: Local osciallator Si570 |
Phase 4: G59 USB connection
| Phase 5: G59 Receiver assembly | Phase 6: G59 Input-Output HP-LP Filters |
Phase 7: Band pass filters and control logic | Phase 8: CW monitor | Phase 9: Transmitter circuits assembly |
Phase 10: Microphone preamplifier | Phase 11: Si570 Quasi oven circuit | Phase 12: G59 Receiver Image Calibrator | GBOX assembly

"What can I do with 10 milliwatts?"

So you have just finished the assembly of your Genesis G59 transceiver. Knowing that the output power is just 10 milliwatts, you are now ready to rush to the assembly of the GPA10 amplifier. Please hold your horses - by jumping ahead, you will miss the most exciting bit: the enjoyment of making one and two way contacts at milli-power level! Yes, this is the best kept secret of ham radio! Read More...


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