Diamond CR8900 – Four-band mobility without compromise
Diamond CR8900 is an advanced multi-band mobile antenna designed for full integration with quad-band two-way radios (e.g. the Yaesu FT-8900R or Wouxun KG-UV980P). This equipment is dedicated to demanding mobile radio operators who need reliable communication in the VHF/UHF bands and want to make full use of the propagation characteristics of the 10m and 6m bands (the so-called \magic band\") while operating on the move, without having to install several separate antennas.
Key advantages and benefits for the user
- Quad-Band Design (10m / 6m / 2m / 70cm)
- Feature -> Benefit: Support for four amateur bands using a single radiator. This eliminates the need to install antenna diplexers/triplexers or drill multiple holes in the vehicle body.
- High power gain in the UHF band (5.5 dBi)
- Feature -> Benefit: The use of a 2 x 5/8 λ configuration at 430 MHz allows for significant focusing of the radiation beam at a low angle. This translates into a more stable connection with repeaters and a greater range in urban terrain.
- Radialless Operation (144 / 430 MHz)
- Feature -> Benefit: The 1/2 λ design for VHF and the aforementioned 2 x 5/8 λ for UHF do not require counterpoises or direct contact with the vehicle's ground for proper resonance on these bands. This makes it easier to choose a mounting location on elements such as the trunk lid (using edge mounts such as the Diamond K400).
- F.O.S. (Fold-Over System) Quick-Fold System
- Feature -> Benefit: The hinge at the base allows the radiator to be tilted down with a single pull of the hand. This protects the antenna from mechanical damage and allows trouble-free entry into low garages or underground car parks without having to unscrew it.
- Independent Tuning of the 29 MHz Band
- Feature -> Benefit: Adjusting the length of the top element using Allen screws lets you precisely tune the SWR minimum to a selected segment of the 10m band (factory-optimized for the FM segment).
Diamond CR8900 technical data:
- Operating frequency:
- 29.5 - 29.7 MHz (10m)
- 51 - 54 MHz (6m)
- 144 - 148 MHz (2m)
- 430 - 450 MHz (70cm)
- Power gain:
- 2.15 dBi (29/50/144 MHz)
- 5.5 dBi (430 MHz)
- Maximum power: 60 W (FM) / 150 W (SSB)
- SWR: Less than 1.5:1 (at resonance)
- Characteristic impedance: 50 Ohm
- Electrical configuration:
- 1/4 λ (29/50 MHz)
- ½ λ radialless (144 MHz)
- 2 x 5/8 λ radialless (430 MHz)
- Overall length: 1.26 m
- Weight: 490 g
- Connector type: UHF male (PL-259 / M plug)
- Country of manufacture: Japan (Made in Japan)
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