Re: Gamma-matching antenna tuner
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Ah, correction:
I saw somewhere that spurious emission OF UBITX is at the level of -45dB toward the fundamental frequency.// hiro
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Christopher,
I saw somewhere that spurious emission is at the level of -45dB toward the fundamental frequency.
However, Japan¡¯s latest spurious regulation requires more than -50dB and so I started thinking about pi-match tuner or BPF.
This doesn¡¯t mean that uBitx doesn¡¯t suppress good enough spur but it just means that Japan¡¯s regulation is a little tight, I suppose.
// hiro, JJ1FXF
Would they not just need band pass filters for whatever the desired band is? I kind of see where you might be able to suppress spurious emissions in a tuner, but why? My limited understanding is that the ubitx has filters for hf bands 20 meters and lower. Do they not provide enough suppression?? If not a filter should be pretty straight forward to construct. No?
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