Special interests: low loss transmission by choosing the optimal antenna
coupler and the optimal feed line. End fed wire antennas.
Planning and pre-calculations for optimized antenna systems regarding
hf-energy losses.
To see examples click one of the blue buttoms: "balanced antenna tuner";
"end fed half-wave antenna"; "air core balun"
technical data / working conditions (HB9)
transmitting / antenna systems :
tx/rx : Yaesu FTDX-10 ; SSB 100 W , CW qrp 10 W
ant / coupler: 1.81 MHz : T-antenna (dipole 2x17m short-outed at the beginning end of the ladder-line, excited against ground); low loss unbalanced Cs-Lp-network
ant / coupler: 3.5 MHz / 5.3515 MHz / 7.1 MHz / 10.1 MHz: NVIS-dipole 2 x 17m, height 4.5 to 8 meters / 600 Ω symmetric feed line / coupler at 6m over ground: low loss symmetric Cs-Lp- (high-pass) -network
ant / coupler: 14.0 MHz / 18.1 MHz: vertical monoband endfed halfwave antenna, feed point 10m over ground. Coupler: LC-network. Common mode choke
ant / coupler: 21.0 MHz / 28.0 MHz: vertical monoband endfed halfwave antenna (Zepp), feed point 12m / 14m over ground. Coupler: symmetric 392 Ω Wireman feeder as ʎ/4-transformer. Common mode choke
technical data / working conditions (Italy)
tx/rx: Xiegu G90: 20 W / optionally Hardrock-50 final stage : 60 - 70 W (SSB)
ant : 3.5 MHz - 29.7 MHz : dipole 2 x 20 m, about 10m above ground / 583 Ω symmetric feed line / coupler : low loss symmetric Ls-Cp- (low-pass) -network
qrv (HB9):
1.81 - 2.0 MHz: 20 W
5.3515 - 5.3665 MHz : 15 W EIRP
3.5 - 3.8 MHz, 7.0 - 7.2 MHz: 100 W
20m, 17m, 15m, 10m : 100 W
operating modes: CW / SSB
HF-Propagation analysis with:
Reverse Beacon Network (RBN), Websdr, WSPR;for Europe: Ionosondes (Juliusruh, Dourbes, Rome)
for point to point communication prediction: HF Systems (Australian Space Weather Forcasting Center)
qsl : electronic qsl (if requested) via : www.eqsl.cc
contact : hb9awj@de-suisse.ch