The Messi & Paoloni CONTEST-FLEX 10 is a 50 Ohm coaxial cable designed for radio communication applications where good performance, flexibility and excellent value for money are required.
With an outer diameter of 10.3 mm / .400", this cable is especially suitable for HF and VHF installations, making it a very interesting option for amateur radio stations, rotor antennas, radio-to-antenna connections, transmission systems and installations where lower loss is required compared with more basic coaxial cables.
The 19-wire stranded centre conductor provides good flexibility, making cable routing easier in installations with bends or mechanical movement, such as directional antennas with rotors. The additional shielding foil helps protect against electromagnetic interference, contributing to reduced background noise and improved signal stability.
Main features
- 50 Ohm RF coaxial cable
- Model: Messi & Paoloni CONTEST-FLEX 10
- Outer diameter: 10.3 mm / .400"
- Optimised for HF/VHF bands
- 19-wire stranded centre conductor
- Good flexibility for tighter bends
- Suitable for rotor antenna installations
- Better performance than RG213-type cables in many applications
- Additional foil shielding against electromagnetic interference
- Shielding efficiency: >105 dB
- Good quality/price ratio
- Suitable for radio, antenna and telecommunication systems
- Available by the metre or in selected lengths, depending on stock/sales option
Recommended applications
- Amateur radio stations
- Radio-to-antenna connections
- HF and VHF antennas
- Directional antennas with rotors
- Base stations
- Telecommunication systems
- Fixed radio communication installations
- Low-loss RF cable runs
- Replacement for RG213-type cables where better performance is required
Important note
This cable is mainly recommended for HF/VHF installations. For applications above 400 MHz, or where maximum UHF/SHF performance is required, other Messi & Paoloni cables such as ULTRAFLEX 10/C may be more suitable, depending on frequency, power and cable length.
For direct burial, Messi & Paoloni recommends specific cables such as AIRBORNE 10 or EXTRAFLEX BURY 10.
Attenuation and power table
Attenuation — 20°C
| Frequency |
Attenuation dB/100m |
Attenuation dB/100ft |
| 1.8 MHz |
0.5 |
0.2 |
| 3.5 MHz |
0.8 |
0.2 |
| 7 MHz |
1.1 |
0.3 |
| 10 MHz |
1.3 |
0.4 |
| 14 MHz |
1.5 |
0.4 |
| 21 MHz |
1.8 |
0.5 |
| 28 MHz |
2.1 |
0.6 |
| 50 MHz |
3.0 |
0.9 |
| 144 MHz |
5.4 |
1.6 |
| 430 MHz |
10.5 |
3.2 |
| 462 MHz |
11.0 |
3.3 |
| 467 MHz |
11.1 |
3.3 |
Recommended maximum power — 40°C
| Frequency |
Maximum power |
| 1.8 MHz |
8300 W |
| 3.5 MHz |
6840 W |
| 7 MHz |
5760 W |
| 10 MHz |
5140 W |
| 14 MHz |
4500 W |
| 21 MHz |
3770 W |
| 28 MHz |
3210 W |
| 50 MHz |
2330 W |
| 144 MHz |
1270 W |
| 430 MHz |
660 W |
Note: Power values are indicative and depend on real installation conditions, ambient temperature, SWR, ventilation, connector type and assembly quality.