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- Homebrew balanced-L antenna tuner.
- Covers 160-10m. Designed specifically for balanced feedlines.
- Inductors are cut from 100-turn 92uh B&W coil stock.
- 20-500pf variable capacitor available new from Henry Radio. Can be switched from input to output of circuit with knife switch to match hi-Z and low-Z loads. (Builder's note: This cap is total overkill considering the wimpy input balun!)
- Input balun consists of 17-turns of RG-58/U coax on an F-240-77 ferrite core available from CWS.
- Base is a hardwood award plaque sourced from a trophy store for $15.
- Nickname: "Frankie" after the V-shaped arcing contacts in the old Frankenstein movie.
- Rear view.
- Read L. B. Cebik, W4RNL's thoughts on Balanced-L Antenna Tuners
- More Balanced L antenna tuner builder's notes
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- The removable "drawer" that allows band changes to be made via changing allicator clip positions on the coil.
- Note "parking" terminals for the idle set of gator clips.
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- Front view of the coil assy, note the aluminum tabs that contact the rest of the circuit when the drawer is replaced.
- The contacts are simple but effective: Braided wire rests on top of a 1/4" foam strip that is affixed just behind the tuner's front face above the 3 knobs. Upon replacing the drawer, the four aluminum tabs trap the braided wires agains the foam. Contact!
- It took me quite a while to chart out clip and knob settings were when I first got this tuner! The high Q means that you have to retune every 25-50Khz on the lower bands.. but RFI suppression is great and the efficiency is unbeatable.
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- KW-107 SUPERMatch antenna tuner.
- Z-Match circuit, very nice controls.
- Rated at 100W contrary to the name. There was a KW-109 model that was supposedly rated for 1KW.
- Inside view (where's the beef?)
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- LDG AT-11MP 200W auto tuner.
- Works pretty well but I prefer the Antec for my doublet. The AT-11MP is destined for my mobile setup.
- OOS (sold this equipment).
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- Ten-Tec AC5 tuner.
- Link-coupled circuit.
- 10W max.
- Designed with no cover to allow easy access to gator clips.
- Ten-Tec AC5 Antenna Tuner Operating Instructions PDF
- Top view (Macro pic, 650K!).
- Two AC5s. Note differences in rotor shafts and knobs. Original AC5 box and Ten-Tec AC5 manual.
- Interesting tuner test done by W0RSP.
- Now deployed at my office QRP station feeding a 200ft horizontal loop via TV twin lead up 35ft. Tunes 1:1 on all bands 6-40m and gets great reports!
- Email Ten-Tec and tell then you want a 20W version for your new Argonaut V!
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