oe6rcd
27-11-2005, 16:04
It is very easy to modify the SONY ICF-SW30.
1. Open the back cover (4 screws marked with an arrow)
2. Take IF signal from Q17 (located above CX20111), GND from a nearby pin (see enclosed picture).
I recommend to add an addional IF Filter in the signal path to the IF-Down Converter. This will give a slight better S/N Ratio.
The 2nd. IF Frequeny of the SW30 is 460 khz. You must tune 5 khz above the desired freqency if you are using a IF Converter that is designed for 455 khz.
DRM reception is very good with this receiver.
I am using an IF Converter with NE 602. Reference frequency is generated from a PAL Xtal (4,433 Mhz) divided by a 4017.
1. Open the back cover (4 screws marked with an arrow)
2. Take IF signal from Q17 (located above CX20111), GND from a nearby pin (see enclosed picture).
I recommend to add an addional IF Filter in the signal path to the IF-Down Converter. This will give a slight better S/N Ratio.
The 2nd. IF Frequeny of the SW30 is 460 khz. You must tune 5 khz above the desired freqency if you are using a IF Converter that is designed for 455 khz.
DRM reception is very good with this receiver.
I am using an IF Converter with NE 602. Reference frequency is generated from a PAL Xtal (4,433 Mhz) divided by a 4017.