Re-ran the test as per Eric's recommendations below. Just for clarification, remove the *_To Line Out_ *cable on rear of SDR. Set V RMS to 1.00 Run Test Line Out 3 & 4 terminated across 50 ohm load shows 1.69 vac. Terminating this line for the test eliminates the variations due to differing test equipment impedances. Line Out 3 & 4 unterminated, read with high impedance DMM indicates 6.38 vac Set value back to default or as -read value (per above) *before *reconnecting patch to Line Out jack on SDR
73, Kirb - VE6IV > > -----Original Message----- > From: Eric Wachsmann - FlexRadio [mailto:[EMAIL PROTECTED] > Sent: Wednesday, April 05, 2006 3:25 PM > To: 'root [knesbitt]'; FlexRadio@flex-radio.biz; > [EMAIL PROTECTED] > Subject: [SDR-1000] RE: [Flexradio] PreSonus Firebox Output Voltage > Descrepancies > > I went back to the drawing board and tried to measure this myself and > had trouble. Apparently our hard clipper that we added for the FireBox > to prevent overdriving the transmitter is the culprit. Rather than a > single tone @ 600Hz at 6.39VAC, you will get something like a square > wave (nasty distortion) at 1.97VAC. To see the true full value, you can > use the following procedure VERY CAREFULLY: > > 1. Disconnect the audio cable so that it is nowhere near the SDR-1000. > ;) > 2. Plug in a value to the V RMS right by the test button that is below > 1.5V. > 3. Run the test. > 4. MAKE SURE to change the value back to the default setting before > plugging the cable back into the radio!!! > > We will address this in the software in future releases. > > > Eric Wachsmann > FlexRadio Systems > > > > > > > > > >
