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I said that on the basis of the results shown in the table by Hiro. At 15m he has shown the biggest spur at 42Mhz not the one Allison first detected on 23Mhz. For the one at 42Mhz a CB low pass should suffice.
Il 17/ago/2018 20:13, "Arv Evans" <arvid.evans@...
> ha scritto:
Might not want to encourage uBITX users to expect that a CB filter will make it legal
on 15 meters. The 15M spur is in the 23 MHz range so would not be attenuated by
a 30 MHz LPF.
Hi Hiro, nice analysis, if I understand right if you add also any 30mhz (also like CB) lowpass filter you may transmit on 15m band. Isn't? Is the Trio tuner a simple pi-tuner? I have just done a variable low pass filter with a double 450pf air variable capacitor a six position switch and a 130-7 toroid and looking at PC the results from my antenna analyzer it seems better than expected.