Further clarification: _DO NOT_ use the "as-read" terminated value in the SDR console/audio/soundcard/output voltage setting. The terminated reading is only to be used as a reference for those who obtain a significantly different unterminated voltage level due to loading variations.
Cheers. Kirb, VE6IV ---- root [knesbitt] wrote: > > 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 > > > > > > > > > > > > > > > > > > > > > > >
