Circular polarization -Turnstile HF antenna
for 80 meter band
Click the pictures to enlarge
antenna on map
Turnstile antenna dimensions (only on dipole drawn)
Turnstile antenna setup in the field. Mast 15 m. Guy wires
1mm and 2mm Kevlar ropes.
image in fog by XYL Ulla
Turnstile antenna GND view. 18 meter Spiderbeam shortened to 15 meters.
Fiberglass mast bottom. Note the two coax cables, one for
Low loss Ultraflex7 (wimo.de) one electrical wave length cables, each 67.3
Installation team OH7SV, OH7FVG, OH3YP and OH2NLT photographer.
Installation was during the JUMA 10 years celebration at
OH7SV remote station.
Dual common mode balun. Back plate is 6 mm Polycarbonate.
The box is Multicomp G256 Polycarbonate 80 x 80
x 55 mm.
Dual common mode balun box open. 7 turns RG-316 PTFE coax
on Wurth 742700790.
The polycarbonate plate was fixed to fiberglass mast with stainless
steel 28mm U-bolts.
2 x type N bulkhead sockets. Note the breathing holes on
washers and nuts are stainless steel material A4.
Turnstile Controller main board
Close view of the quadrature hybrid coil. 13 turns 1mm
enamel cu wire in parallel.
Core iron powder Amidon T-106-6
JUMA TC Turnstile
Controller Schematics (pdf)
TC Turnstile Controller Layout (pdf)
JUMA TC Turnstile Controller
Many thanks to Michael
OH2AUE for helpful advice!
If you are interested in a JUMA TC controller as a kit please let me know.
Back to OH7SV projects