Circular Polarization - Turnstile Antenna
for 80 meter band
with JUMA Turnstile Controller JUMA TC
Click the pictures to enlarge
Turnstile 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.
Art 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 each dipole.
Low loss Ultraflex7 (wimo.de) one electrical wave length cables, each 67.3
Installation team OH7SV, OH7FVG, OH3YP and OH2NLT
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.
Two common mode baluns in the box. 7 turns RG-316
PTFE coax on Wurth 742700790 ferrite core.
plate is fixed to fiberglass mast with stainless steel 28mm U-bolts.
2 x type N water proof bulkhead sockets. Note the
breathing holes on the bottom of the box.
screws, washers and nuts are stainless steel material A4.
JUMA TC Turnstile Controller. It can be used from
QRP level to legal power.
You can select between remote control and X, Y, LHCP, RHCP antenna.
It is compatible with Remoterig I/O by interface with standard ethernet
You can remotely select X, Y, LHCP, RHCP antenna with
the two I/O signals. See Remoterig snap-hot.
PTT control signal is needed to swap polarization between transmit and
JUMA TC Turnstile Controller main board layout.
The dummy load is implemented with two 35W SMD resistors.
Close view of the quadrature hybrid coil for 3.7MHz.
13 turns 1mm enamel cu wire in parallel.
Core iron powder Amidon T-106-6. Other bands
are possible with corresponding windings and capacitors.
The coil reactance XL is 2 x 50 ohms and both the capacitor's XC is 100
ohms each for desired frequency.
TC Turnstile Controller Schematics (pdf)
JUMA TC Turnstile Controller Layout (pdf)
JUMA TC Turnstile Controller
Many thanks to
Michael OH2AUE for helpful advice!
JUMA TC (Turnstile Controller) is available as a kit with a
price of 115€ from JUMA SHOP
To EU countries the price is 142.60€ (VAT 24%)
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