Hi! FYI I have successfully obtained the technical certification of BITX40 by having added the modification to suppress of spurious of BITX40 from the relevant authority of telecommunication of Japan.

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Dear Jerry aa1of, The modification for suppress the spurious of this time is as follow. I hope this would be useful for you. 1) Add 3.3uF electrolytic capacitor and 0.1uF x 2 bypass capacitor to VCC l

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lan and everyone who replied me I did not use uBITX manager. But I have understood that using uBITX manager is essential to set CW offset and for uBITX. Now everything has been cleared by setting uBIT

#ubitxcw

Hi! Thank you for your comment and advice. My friend have found the cause of spurious of 75 KHz. He said the cause of spurious was the noise of VCC around 19 MHz of 0.15V. As the result of the modific

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Hi! Thank you for your advice and comment. Firstly, I did not consider that frequency displayed on the commercial rigs is TX frequency even though frequency of uBitx is RX. But I am still wondering wh

#ubitxcw

Hi! I would like to know whether the behavior of TX frequency of uBitx at CWL and CWU mode I experienced is normal on CECFW v1.08. For instance, When there is the CQ station on 7.0100MHz on my ICOM tr

#ubitxcw

Hi Allard san, I am glad I can contact with you on this group too. As Raj san mentioned, unit of the frequency of spurious is KHz. Akira JJ1EPE

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MVS Sama, Thank you for your prompt reply. My friend measured the spurious. I will ask my friend to check whether cause of spurious is the power supply. Regard, Akira JJ1EPE

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Hi! 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 w

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