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I just put my uBitxr4 on the spectrum analyzer and found nothing +-250 Khz. That is 500 Khz BW.
I think your measurements are being affected by switch mode power supply in one of the items.
At 25-06-18, you wrote:
I built Bitx40 about 2 weeks ago.
I measured the spurious of Bitx40 by using the spectrum analyzer.
The level of spurious of harmonics were under 50db. So this is fine.
But the spurious at 75KHz was observed.
The spurious might be the multiple of 25KHz.
It would be much appreciated if you could advise me the cause and solution of this spurious of Bitx40.
In Japan, we must prove to the authority that the spurious of the transceiver meets the criteria to obtain the certification of the transceiver from the authority.
So if i could not resolve this spurious, I will not be able to use Bitx40 in Japan.
Thanks in advance,