The following changes will improve the adjacent rejection of the TS-940S when a relatively strong nearby signal is present (s-4 or above).
The AGC switch should remain in the SLOW position for all but high speed data communications. Most CW operations will also benefit from operation in the SLOW position.
15 Kohm ¼ watt resistor, (RD14CB2E153J)
1 µF 16V Electrolytic, (CE04W1C010M)
1S1555 diode, (V1S1555)
.047 µF capacitor, (C91-0119-05)
- Remove jumper wire JP7 and replace it with the parallel combination of the 15 Kohm resistor and the 1S1555 diode. Pay close attention to polarity.
- Add the 1 µF capacitor as shown in the diagram.
Change capacitor C75 from a 1 µF 50V capacitor to a .047 µF 50V capacitor.
Time required for this modification is 1 hour or less.