开云体育

I don't see a post yet that clearly spells out how to take care of the spurs.
This should include pointers to specific parts, show how they get mounted to the board,
include fixes for both the 45mhz-DialFreq and the 12mhz spurs.
And not be spread across dozens of different posts over the past couple months.

There are still questions about the 12mhz spur fix, do Farhan's notes really result
in something that resonates at 12mhz?? Is there a way to avoid knocking out 30m?

It's easy enough for some of us to get there with the information provided.
But I'd say it's not yet clear enough for the majority of uBitx owners.

I'm not finding time to do much other than pontificate here myself.
And I suppose that means I'm fair game for criticism, so have at it.
But creating easy to follow instructions to cure harmonics and spurs is critical here,
and I intend to push the issue now and then if it does not get resolved.

Once we have complete instructions down that have been properly vetted,
it should be possible for everyone to confidently mod their rig for spurs and harmonics.
Till then, it will take a spectrum analyzer to verify the fix is correct.
Or a day with a step attenuator and a general coverage receiver

Looks like HFSignals is still shipping boards with no mods to address harmonics or spurs.
? ??/g/BITX20/message/62307

In message 62308, Raj does say the Axiom relays do address the harmonics if not socketed.

He also states:? "The 45MHz filter fix of mine and the LP filter of Farhans does the same thing."
I vote for the LP filter, as the extra 45mhz crystal filter is much tougher to obtain than coils and caps,
Note that the new crystal filter would have to match the center frequency of the filter at Y1,
these filters are often sold in pairs to ensure a match.

Jerry, KE7ER

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