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Good morning John, I now realized that I sent the wrong photo, in reality the C30 is installed, instead for L4 I used the yellow T37-6 because on the color scale the yellow ranges from 3 to 50 MHz while the red one ranges from 1 at 30 Mhz, so it seemed appropriate to use the yellow one, I didn't find anyone who advised me, I did everything as it seemed right to do, after all we all do experiments with our radios and during the assembly phase of the qcx mini I experimented on the toroid, I think it went well, up to now it has been transmitting 3 W in the antenna without stopping for 2 and a half years without losing power, I had some nice positions in the WSPR map, also in CW, a few days ago it also arrived in Dk8ne on 01/14/2024 in the absence of propagation.? I can not complain.? I hope your project goes well too, keep me updated on the calibration and the first transmission you will do.? Hans has created some magical boxes that will never cease to amaze me.? With 5 W at 20 meters I managed to do MANY CW QSOs as far as the USA with my car's antenna, truly surprising.? Thanks to QRP LAB.? 73 Hi John

I forgot, here in Italy I think I was the first to modify the QCX mini for the 6 m band and the first to have a fixed WSPR beacon, there aren't many WSPR enthusiasts on 6 m.

Giuseppe iu8eun