Adding topband to a full sized elevated 80m vertical and putting N6LF’s QEX data to the test
This antenna started out as an 80m vertical – with160m capability added as a secondary consideration. In reflection, I’m very glad to have added the 160m operation as that is a fascinating band.
It’s now on it’s second version (v2), with a conversion from a trap-based to relay-based band selection and full matching net now complete.
From the diagram, you can see that 50 ohm feed line runs to the 2×6 switch (mounted on a tower about half way to the vertical), and from the switch onward to the vertical, it’s 75 ohm RG-11. The LC network is a few feet below the vertical’s base. It’s an elevated structure, with 10 elevated radials at head-height. A control line runs from the shack to the vertical allowing some relay switching which engages the cap hats to shift the resonant point of the vertical from 80m to 160m – and to likewise set the L/C for the band in operation….. READ MORE
The new 6-4-20 is a serious performer with an 11.1m computer optimised tapered boom and 10 elements on both 50MHz and 70MHz with a single feed point.... Read more
Introduction and Background This is an experimental project that may lead to further development in the future, but even as presented below, it does w... Read more
Edmund M0MNG gives a ‘first impressions’ unscripted review of a new product. The WSPRlite is available from SOTAbeams and is proving very... Read more