[DSP-10] N5BF/6 DSP-10 retweaked using KA7EXM meter.

[Courtney Duncan]

I finally got around to the much anticipated RF/IF chain re-peaking
using my new KA7EXM power meter.

The story is the 2007 December 15 entry at

http://cbduncan.110mb.com/HamRadio/Dsp10/PhaseTwo/PhaseTwo.html

The summary is that the IF is now somewhat flatter and compares very
favorably to the similar W7PUA measurements.  Broadband, I moved the
RF response down about 2 MHz so that the sweet spot is in the desired
144-145 MHz range and the rolloff is happening above 147 rather than
below 145 as it was before.  This lets me get up to spec output on the
rig and the Brickette.  It's still not perfect but will do for now and
has the good performance where I want it.

I detailed my procedure for getting the IF ripple low tuning L12 and
L13 for anyone who is interested.

Anyone have hints as to how to get the broadband tuning right?  Seems
like it might be "easy" to write a DSP-board program that puts out
carriers at different frequencies sequentially (spectrum analyzer
style but power-meter slow) to facilitate this.

(Yes, the ability to do "easy" software is crawling up my list.)

Courtney, n5bf/6