I have the DDE 3.0 instruction sheets, will be glade to copy and send to you. Just email me your mailing address .
Hope this can get you started
NO/JUMPERS / 3.60 volts rms 0db
J6/J7 position 1 / 1.14 volts rms -10db
J6/J7 position 2 / 360 MILIVOLTS rms -20db
J6/J7 position 3 / 110 MILIVOLTS rms -30db
J6/J7 position 4 / 40 MILIVOLTS rms -40db
Instruction say to start at position 2 (360 milivolts) and if you need more gain move jumper to position 1 (1.14volts)
Dave
Hope this can get you started
NO/JUMPERS / 3.60 volts rms 0db
J6/J7 position 1 / 1.14 volts rms -10db
J6/J7 position 2 / 360 MILIVOLTS rms -20db
J6/J7 position 3 / 110 MILIVOLTS rms -30db
J6/J7 position 4 / 40 MILIVOLTS rms -40db
Instruction say to start at position 2 (360 milivolts) and if you need more gain move jumper to position 1 (1.14volts)
Dave