DigiLite Setup Procedure

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MN-tech
Posts: 55
Joined: Thu Aug 30, 2012 6:01 pm

DigiLite Setup Procedure

Post by MN-tech » Thu Aug 30, 2012 6:32 pm

I have successfully setup 3 DigiLite Ver 5.7 boards. Here is an easy procedure I've worked out.

Use the Digilite configuration program to set TEST MODE to "IN PHASE"
Make sure the symbol rate matches the Nyquist filter frequency, (4000K typ)

Use an oscilloscope to set the I drive level at IC3 pin 7. Adjust Level pot R23 and Bias pot R29 for a 2 volt peak to peak sine wave signal swinging from 1.4 VDC to 3.4 VDC.
Set the Q drive level at IC3 pin1 using Level pot R16 and Bias pot R30 for the same waveform.
You will likely have a passable signal at this point. To finish the setup connect a spectrum analyzer and tweak the Bias pots to null out the carrier.

MN-tech
Posts: 55
Joined: Thu Aug 30, 2012 6:01 pm

Re: Waveform photos

Post by MN-tech » Fri Aug 31, 2012 12:59 pm

I-Q drive signal
Image

IN PHASE not nulled
Image

IN PHASE nulled
Image

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