DF6RK
04-11-2005, 17:34
The modification of the Yaesu FT-890 for DRM with the mininatur mixer from www.sat-schneider.de is very easy and can be done within two hours.
1. Disclaimer: modifying your transceiver at your own risk !!
2. Remove the lower cover from the transceiver.
3. Locate D2040 close to the CW-Filter, at its cathode you can take the 455kHz IF
4. Locate J2011 Pin13 to get the 8V @ RX, the power for the mixer unit
5. Locate J2028 for the 12kHz outlet
6. but you have to remove the RF-Unit first to solder your
connections on the "chip-only" side, don't forget the ground
7. DO NOT forget to cut the 13.5V from J2028 !!!!
8. fix the rf-unit, make your connections to the mixer unit and fix it carefully at a suitable location
9. connect J2028 to your soundcard, start your DRM-Software and set the output level at the mixer unit
10. close the cover and enjoy DRM
Attached you will find a small help, good luck !!!
Greets,
Ralf
1. Disclaimer: modifying your transceiver at your own risk !!
2. Remove the lower cover from the transceiver.
3. Locate D2040 close to the CW-Filter, at its cathode you can take the 455kHz IF
4. Locate J2011 Pin13 to get the 8V @ RX, the power for the mixer unit
5. Locate J2028 for the 12kHz outlet
6. but you have to remove the RF-Unit first to solder your
connections on the "chip-only" side, don't forget the ground
7. DO NOT forget to cut the 13.5V from J2028 !!!!
8. fix the rf-unit, make your connections to the mixer unit and fix it carefully at a suitable location
9. connect J2028 to your soundcard, start your DRM-Software and set the output level at the mixer unit
10. close the cover and enjoy DRM
Attached you will find a small help, good luck !!!
Greets,
Ralf