Review of W8TEE, AC8GY STL (Radcom Feb 2020)

(Purdum 2020) describes a small transmitting loop (STL) which is a little novel in that it uses an arrangement of four circular conductor loops, two in parallel in series with the other two in parallel. The article goes on to claim some pretty extraordinary efficiency calculated from radiation resistance for a loop structure that is … Continue reading Review of W8TEE, AC8GY STL (Radcom Feb 2020)

STL propaganda indeed: QW vertical – dipole – STL model pattern comparison

STL propaganda indeed: dipole – STL pattern comparison compared the patterns of a Inverted V dipole and STL, both configurations typical of SOTA deployments. Seeing some pretty wild extrapolations to a vertical quarter wave with elevated radials, again typical of SOTA deployment, this article presents a comparison of all three using NEC-4.2 models. See STL propaganda indeed and STL … Continue reading STL propaganda indeed: QW vertical – dipole – STL model pattern comparison

STL propaganda indeed: dipole – STL pattern comparison

At STL propaganda indeed a realistic model was developed of the Chameleon P-Loop2 on 20m, similar to that used in the experiment Comparing the performance of an inverted vee dipole with a small transmitting loop on 20m. This article presents NEC-4.2 derived radiation patterns for both the loop and Inverted V Dipole used for the experiment using data … Continue reading STL propaganda indeed: dipole – STL pattern comparison

STL propaganda indeed

Recent postings to List your favorite SOTA antenna on QRZ.com referred to an experiment Comparing the performance of an inverted vee dipole with a small transmitting loop on 20m as propaganda. The experiment above states The manufacturer of the loop gives a calculated efficiency of 39.754% at 14174 kHz. This is very similar to that claimed by Chameleon of … Continue reading STL propaganda indeed

Review of Dunlavy’s STL patent gain claims

(Dunlavy 1967) sets out his description of a wide range tunable transmitting loop antenna and makes a broad efficiency claim of better than 30% (-5.3dB) for his system. Minimum efficiencies of 30 percent are attainable with practical designs having a diameter of only 5 feet for 3-15 Megahertz coverage. In a context where extravagant claims … Continue reading Review of Dunlavy’s STL patent gain claims