CALLSIGN PROPINSI,KOTA GATEWAY/SYSOP FREKUENSI
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YB0AA Jakarta, Jakarta MACAN KEMAYORAN 146.380 MHz
YB0BUI Jakarta, Jakarta TANJUNG PRIOK/Yanto 147.960 MHz
YB0KYM Jakarta, Jakarta KEBON JERUK/Rusdi 147.940 MHz
YB1EE Jawa Barat, Bandung MAUNG/Irwan 147.580 MHz
YB2DWJ Yogyakarta, Yogyakarta GUDHEG JOGJA/Wahyoe 146.930 MHz
YB9BOB Bali, Denpasar DENPASAR MOON/Pande 146.160 MHz
YB9WD Jayapura, Jayapura CYCLOPS/Wied 145.850 MHz
YC0MJN Jakarta, Jakarta RAWAMANGUN/Laurens 147.920 MHz
YC1BQN Jawa Barat, Bandung ANTAPANI/Nehroe 147.070 MHz
YC3LSB Luthfi 146.020 MHz
YC3NEN Jawa Timur, Malang AREMA/Rully 146.520 MHz
YC4FIK Sumatera Selatan, Palembang MUSI/Donny 145.950 MHz
YC4INO Bangka Belitung, Pangkal Pinang SAHANG/Ino 144.620 MHz
YC4SJ Lampung, Bandar Lampung KRAKATAU/Jojon 146.420 MHz
YC7BWW Kalimantan Barat, Pontianak PONTIANAK 147.700 MHz
YC8DWC Sulawesi, Mamuju MANAKARRA/Dirman 144.600 MHz
YC8SAI Sulawesi Utara, Manado DABUDABU/Vira 146.860 MHz
YD1IDI Jawa Barat, Cianjur MACHO/Susanto 145.520 MHz
YD4BAT Jambi, Jambi SEPUCUK JAMBI 9 LURAH/Zaini
YD5EGY Sumatera Barat, Padang HAMKA/Iwan Gunadi 146.530 MHz
YD6ENH Aceh Tapaktuan, KOTA NAGA
YF5TGD Riau, Batam BARELANG/Daud 144.970 MHz
YF5WL Riau, Batam MANDAU 144.100 MHz
Tampilkan postingan dengan label Info Tehnik. Tampilkan semua postingan
Tampilkan postingan dengan label Info Tehnik. Tampilkan semua postingan
10 September 2009
05 April 2009
Revolutionary Yagi Antenna Feed System
Justin Johnson G0KSC, says that he has pioneered a revolutionary new feed system for the Yagi directional beam antenna, which will see it's Debut in the next issue of DUBUS - the serious magazine for VHF and up amateur radio www.dubus.org.
Justin writes:
Whilst there are many benefits seen with the new system, the most important break-through is the suppression of the age old problem of unwanted side lobes within longer Yagi designs.
The feed system (which does not consist of a dipole and no, it is not a Quagi!) has 2 different feed points. Whilst the antenna needs re-modeling in order to change from one to the other, different characteristics are seen from each method. The first enhances the bandwidth capabilities of the Yagi and presents never-seen-before ultra low return loss, excellent gain and front to back ratio, whilst the other provides more traditional OWA (Optimised Wide-band array) style bandwidth with good improvements in forward gain and massive improvements in front to back ratio.
What people say, 'This could be a turning point in the development of the Yagi Antenna'
Popa, YU7EF - World renowned Yagi antenna designer/engineer - www.yu7ef.com 'Justin, Indeed this looks like a unique and winning design!', Joel R. Hallas, W1ZR - Technical Editor, QST Magazine. 'Hi Justin, Many thanks for the plots, these diagrams look really beautiful! I have never seen such F/B and low sidelobes for a Yagi before', Joe CT1HZE - DUBUS Magazine
Benefits of the new design
Whilst going to press, experiments are still being conducted with the new Yagi. However, the new feed adds a number of very interesting characteristics to the Yagi which when focus is
applied to optimisation, excellent not-seen-before Yagi performance is the result. The list so far consists of the following :
Justin writes:
Whilst there are many benefits seen with the new system, the most important break-through is the suppression of the age old problem of unwanted side lobes within longer Yagi designs.
The feed system (which does not consist of a dipole and no, it is not a Quagi!) has 2 different feed points. Whilst the antenna needs re-modeling in order to change from one to the other, different characteristics are seen from each method. The first enhances the bandwidth capabilities of the Yagi and presents never-seen-before ultra low return loss, excellent gain and front to back ratio, whilst the other provides more traditional OWA (Optimised Wide-band array) style bandwidth with good improvements in forward gain and massive improvements in front to back ratio.
What people say, 'This could be a turning point in the development of the Yagi Antenna'
Popa, YU7EF - World renowned Yagi antenna designer/engineer - www.yu7ef.com 'Justin, Indeed this looks like a unique and winning design!', Joel R. Hallas, W1ZR - Technical Editor, QST Magazine. 'Hi Justin, Many thanks for the plots, these diagrams look really beautiful! I have never seen such F/B and low sidelobes for a Yagi before', Joe CT1HZE - DUBUS Magazine
Benefits of the new design
Whilst going to press, experiments are still being conducted with the new Yagi. However, the new feed adds a number of very interesting characteristics to the Yagi which when focus is
applied to optimisation, excellent not-seen-before Yagi performance is the result. The list so far consists of the following :
- Superior Front to Back Ratio with very high suppression of unwanted lobes
- Extended/alteration of 'ideal' boom length
- Exceptional clean pattern performance
- Ultra-wideband characteristics
- 50 Ohm impedance – no matching required
- Easy fine-tuning of feed arrangement itself
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