TETRA18 10/15/20/40 DF
TETRA18 10/15/20/40 DUALFEED is a versatile and high-performance quad-band Yagi. On 40 meters, it features a Reflector/Driver configuration, and element size has been compacted using end-loading elements. This solution, originally adopted by W6NL, allows maintaining the performance of a full-size Yagi while limiting antenna dimensions. On 10/15/20 meters, it features full-size elements and a classic configuration: 4 elements on 20, 5 elements on 15, and 7 elements on 10 meters.
No traps or other matching systems are used on this antenna, nor are there any moving parts: no motors or relays that risk breaking! Highly reliable and durable aluminum products are used in the manufacturing of this extraordinary antenna system!
Dual-feed systems allow contest stations to use this antenna as a multi/single band: while one transceiver/amplifier setup transmits on 10/15/20 meters, a second station can simultaneously operate on 40 meters (requires additional BPF to protect equipment).
Requires 2 coaxial cables, one for the 40-meter band and the second feeding the 10/15/20-meter bands.
Requires a heavy-duty rotor
RF Choke: 2X 3kW included
Availability: 8 weeks
| TETRA18 10/15/20/40 DF | 10 m band | 15 m band | 20 m band | 40 m band |
|---|---|---|---|---|
| Gain dBi: (20 meters above ground) |
16.6 | 15.8 | 14.0 | 11.3 |
| Free space gain in dBd: | 8.9 | 7.9 | 6.5 | 4.7 |
| F/B: | 20 | 25 | 20 | 20 |
| Active Elements: | 7 | 5 | 4 | 2 |
| Bandwidth kHz S.W.R. = 1.5:1 |
800 | 450 | 350 | 200 |
| Boom length: | 1140 cm/37.4 HUF | |||
| Turning radius: | 960 cm/31.5 HUF | |||
| Feedlines required: | 2 x 50 ohms | |||
| Max side uplift tower: | 150 cm/4.92 HUF | |||
Longest element: 1700 cm / 56 ft
Power handled: 10 kW
Wind area: 2.5 m²/26.9 sq ft
Wind load 130Km/h: 1525 N
Wind survival*: 160 Kmh – 100 Mph
Tower leg/mast diameter: 50/60 mm – 2/2,36 inches
(larger on request – specify in order form)
RF Choke**: 2x 3 KW included
Weight (packaging excluded): 130 Kg/286 lb
MATERIALS USED
Tubes and plates: Aluminum alloy 6060T6
Hardware: Stainless steel
Insulating clamps: UV resistant polypropylene
Manual: English
*Wind survival is the maximum wind speed the antenna can withstand without permanent deformation (calculated without ice)
**Momobeam RF Choke (standard product offering, rated at 3 KW) is made with high-quality, double-shielded, low-loss Teflon dielectric coaxial cable with properly selected ferrite material that is coated on the cable which together create a high impedance path for RF, providing high isolation between the antenna and the coaxial feed line.
A female SO-239 connector is included for convenient connection to the customer's feed line and their male PL-259 connector.
The 5 KW and 10 KW rated RF Chokes (optional purchase) are made with the same materials, except the coaxial cable is 10mm in diameter.
The 10KW version uses a DIN 7/16 style connector.
