Hi all, I am trying to model a variant of a Doublet http://www.m0pzt.com/80m-cobra-doublet/ with 4NEC2. I have managed to model the main elements (including the folds). Code: CM Cobra doublet CM CM http://www.m0pzt.com/80m-cobra-doublet/ CE SY len=12 'Span length, not element length. SY spacer=0.4 'Spacing between element folds SY height=3 'Height from ground SY radius=0.02 'Element radius/gauge SY offset=0.2 'Centre offset GW 1 19 0 -len height 0 len height radius 'Top GW 2 11 0 -len height - spacer 0 -offset height - spacer radius 'Left GW 3 11 0 -len height 0 -len height - spacer radius 'Left GW 4 11 0 -offset height - spacer 0 -offset height - (2*spacer) radius 'Left GW 5 11 0 -offset height - (2*spacer) 0 -len height - (2*spacer) radius 'Left GW 6 11 0 len height 0 len height - spacer radius 'Right GW 7 11 0 len height - spacer 0 offset height - spacer radius 'Right GW 8 11 0 offset height - spacer 0 offset height - (2*spacer) radius 'Right GW 9 11 0 offset height - (2*spacer) 0 len height - (2*spacer) radius 'Right GE 0 LD 5 1 0 0 58000000 LD 5 2 0 0 58000000 LD 5 3 0 0 58000000 LD 5 4 0 0 58000000 LD 5 5 0 0 58000000 LD 5 5 0 0 58000000 LD 5 6 0 0 58000000 LD 5 7 0 0 58000000 LD 5 8 0 0 58000000 LD 5 9 0 0 58000000 GN -1 EK EX 0 1 10 0 0 0 FR 0 0 0 0 3.71 0 EN However, I am unsure how to include a 450ohm ladder line feed line into the model. So, for those that use NEC type modelling, how do you factor in balanced feeders?
