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![]() "Owen Duffy" wrote in message ... I am working with some guys on ambient noise measurement in a pre BPL scenario. They are using FSM ( http://www.vk1od.net/fsm/ ) to make field strength measurements using a known comms receiver and a Carolina Windom (CW). We need to form a view on the CW antenna system losses (radiator, ground reflection, isolator, matching unit, feedline, ATU. Has anyone built and calibrated NEC models for the CW, or have they measured reliably feedpoint impedance on the various bands. This is not a troll, and I don't want to excite a war over the claimed performance of the CW, I am not interested in anecdotal evidence or QSO evidence as to whether they "work". I see that there will be significant issues in modelling the "secret" components of the CW unless someone has worked out an RF equivalent circuit of those components (the isolator and matching unit). Thanks... Owen Owen, I have done some tentative modelling of the CW; how valid the model is, I am not sure. I used the "TL" card for the actual coaxial feedline, and ran a single wire from the antenna feed point to one side of the TL source segment. The idea was to replicate the coaxial surface current. I don't think the balun (Isolator) will have any effect on the antenna performance. I may even have the code saved someplace if anybody is interested. Why would you not use a calibrated EMC monopole for HF? Frank |
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