Small multiband HF beams- TET-Emtron revisited- 40/20/15/10m 2 element beam
Small multiband HF beams- TET-Emtron revisited While I haven't posted much recently I have been chasing a few wild ideas. I bought a few antenna from a deceased estate, including bits of a couple of TET and TET-Emtron HF beams. TET 2 element 20/15/10 beam TET 2 element 20/15/10 beams are quite innovative, especially considering they were first made pre-1985 with: capacitive hats to physically shorten the element length dual-drive, driving the radiator and reflector, 180 degrees or more out of phase. This doesn't increase the gain much, but does increase the front to back ratio, which is just as good. close-coupling of radiator and reflector to shorten the boom length. I had just the radiator of a version of the HB-23M, which is enough to use an antenna analyser to see what it does, albeit at ground level (which messes up capacitive hats and low frequencies). I have to make up the rest. The traps, the rectangles on the elements, are two parallel R/C circuit...