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You have to know the limitations of the equipment.? I had a good discussion with a production engineer on this.? He cold not understand why the computer readout that was showing 3 decimal places of temperature at about 300 deg C was off by 2 whole numbers.? All this was coming from a probe that had 2 RTDs and 2 thermocouples? in the same 1/2 inch tube.? He wanted to know which one was correct.? I told him to take his choice as they all were.? The TC and rtd were only rated at 2 deg C at that temperature by the makers.? Then each went through a sending unit? that was calibrated to 1/2 of a percent or less, then to the computer unit that had about the same error.? When all the errors were added together we were lucky to get with in 1 % , mostly 2 %.? However we could read to 3 decimal places.

The whole point is that with most parts used in the uBITX and other ham grade equipment is only 5 % or maybe even less, it is pointless to measure a filter cutoff at 12 MHz to within a couple of cycles or a db down.? You may be able to build one that way, but not mass produce them.

I found the filter in my uBITX was too sharp for me and the audio quality on transmit was not what I wanted.? I Changed the capacitors in the filter area? with some standard components.? I can, but did not measure to 10 hz or less, but did get a general overall curve that met my standards, and my friends I talk to all the time said it sounded very good to them.

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