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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 5: G59 Receiver Assembly

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

Schematic Diagram

Click Picture to Enlarge


The G59 PCB comes with pre-installed, ultra-low noise OP amplifiers (IC2R, IC3R), however only a couple of pins have been soldered to the PCB. The first step in assembly is to solder all of the remaining IC2R and IC3R pins.


Next, start with the assembly of IC1R and C4R.
IC1R is located to the right of IC3P, as per photo.



Pay attention of orientation of PIN1.
Note: unlike the previously installed IC3P (Phase 3), the IC1R comes with no visible orientation mark. Pin 1 is located underneath the manufacturer's logo. Position and install IC1R as per photo.



Continue with the installation of resistors and inductors as per photo.


Install capacitors. Note: the value of C13R and C14R equals 100pF.



Install USM capacitors. Note: C5, C6, C7 and C8 are 10nF. C9, C10, C11 and C12 are 100nF.



Install relay RL1R and 2 pin header SV1PB, followed by the remaining electrolytic capacitors.



Install relay RL2R, audio connector KP5 and BNC antenna connector.




Install K1 audio gain cable. Flat two lines, 220mm of wire with 2 pin nylon connectors. K1 connects SV1PA and SV1PB as per photo.

RX Image Rejection Pre-Adjustment

Connect OHM meter between test point A and B (pin 1 of IC2R). With trimmer R23, set the resistance to 330 OHM.



Connect a temporary wire between BNC antenna connector and RX input C1R capacitor.



This completes the assembly of all components in phase 5.


Voltage test

1. Connect 12V DC power supply to plug DC1S.
2. Check the voltage on all pins of IC1R.


pin voltage
1 2.5 V
2 2.5 V
3 2.5 V
4 2.5 V
5 1.67 V
6 1.67 V
7 0 V
8 2.5 V
9 2.5 V
10 2.5 V
11 2.5 V
12 1.67 V
13 1.67 V
14 5 V

3. Check the voltage of all the pins of IC2R and IC3R.

pin voltage
1 4.38 V
2 5.05 V
3 5.05 V
4 0 V
5 5.05 V
6 5.05 V
7 9.66 V
8 4.38 V

These are the indicative values. The voltages up to 10% are acceptable.

Getting "on air" - first receiver test

Connect an antenna (any band between 160m and 6m).

Connect power supply and USB cable. Connect stereo audio cable from receiver output (KP5 connector) to audio card input.

Start GSDR software.

Under PowerSDR Setup - General - Audio set your sound card audio properties, driver and mixer.

At this stage you should be able to receive signals.

G59 Image Adjustment (hardware)

The image adjustment precedure is similar to one described at http://genesisradio.com.au/G3020/a1.html - Please scroll to the bottom of the page.

Fine tune trimmer R23 until the unwanted image is rejected as much as possible. If you have already set the resistance to 330 Ohm, then maximum rejection will be achieved within 1 to 2 turns either way.



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
 

Need help? email: info@GenesisRadio.com.au


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