Jac, W8TEE Number that most are referring to is the black marker pen hand written number? along one edge, usually near the "BITX40v3, (C) " label.? It is not so much a Serial Number as it is the number of boards shipped (mine is number 124). Someone asked earlier about the HF mixer transformers T1 and T2.....they appear to be? 10-turns trifilar twisted conductors on an FT37-43 core.? Same for T-4, T-5, T-6, and T-7.?? These would be typical broadband transmission-line style transformers with turns ratio of 10:10:10.? Arv? K7HKL _._ On Mon, Nov 28, 2016 at 7:37 PM, Jack Purdum econjack@... [BITX20] <BITX20@...> wrote:
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