From numerous experiments done during the last year or two while practicing RaDAR, Ihave come to believe that the best HF antenna for rapid deployment and re-deployment is the End Fed Half Wave Antenna or EFHWA. Various designs have been tried with excellent results. The latest experiment was building and testing the well known Fuchs end fed antenna tuner. This is a very versatile tuner and by using a 21 meter length of antenna wire, any bands from 40m through to 10m, including all the WARC bands, can be tuned very effectively. With a longer wire, around 41 to 42 meters, 80m can also be catered for. Antenna deployment time – FAST!
So what is the Fuchs tuner? The following diagram sums it up quite nicely.
Winding the toroids may look difficult but really are quite simple to do. L3 should take the following form when complete.
Various combinations of control settings have been tried and tested. The authors results were as follows:
21m long wire (No radials or earth)
40m Coupling 3/4 L3 3, Cap 60% SWR Good
30m Coupling 2, L3 2, Cap 100% SWR Good
20m Coupling 3/4 L3 2, Cap 33% SWR Good
17m Coupling 2 L3 1, Cap 90% SWR Good
15m Coupling 3/4 L3 2, Cap 25% SWR Good
12m Coupling 3 L3 1, Cap 50% SWR Good
10m Coupling 1 L3 1, Cap 25% SWR Good
41m long wire (No radials or earth)
80m Coupling 6 L3 4, Cap 90% SWR Fair