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| First attempt with a large space between the loops |
This small loop can handle 20 Watts from 45-10m . Loop circumference is 2.5 m with a Faraday coupling loop of 50 cm . Sticks are 6 mm glass fibre ( kiteshop).The 2 vertical sticks are 41cm and the suports are 34cm long. A 2 x 500 Pf tuning capacitor with the sections put in series is used for tuning. Because of the high Q ( 328 on 14.200 MHz ) a 1:3 reduction is mandatory. The loop is made of RG-213 with the shield and centre soldered together. Highest SWR is 1:1.5 . Despite of bad conditions, contacts were made troughout Europ with 10 Watts SSB. The Faraday coupling loop is made of RG-58 and is bend to a slightly horizontal oval. Reducing the space between the loops leads to a drastic improvement of the swr and return loss.
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| Plot 14.200MHz after coupling loop modification. |
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| Improved coupling by reducing the space between the loops . I used a piece of U-shaped plastic for the looprest. | . |
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Although fast tuning is a big plus with this loop, the overall efficiency is less than the twin capacitor Travelloop further down on this blog. The broadband coupling loop makes a perfect match impossible , especially on 10m.
