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R-8 by Cushcraft
Cushcraft R-8 Vertical Antenna covers extensive EIGHT bands.
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Multiband vertical antennas have always been complicated designs with components as likely to be damaged by high levels of mismatched transmit power as the rigs they are attached to. Before the use of tuners became widespread, the antenna was protected by the same safety mechanisms that protected the rig. Now, the automatic power reduction circuits of the past have actually become a second layer of protective circuitry.
Although the auto-tuner provides the ham with a more versatile device as well as protecting the rig's components, the antenna is more vulnerable than ever. With the press of a button, very high loads can be imposed on the antenna. The result to the antenna can be catastrophic failure in some instances.
Although the antenna is best operated within it's 2.0:1 VSWR bandwidth, it can sustain a 3.0:1 VSWR mismatch at full power for typical operating intervals. Now radio amateurs can take full advantage of the versatility that a tuner used in conjunction with a multiband HF vertical antenna can give them. For high wind environments, add the R-8GK, Guy kit-three point non-conductive guy system.
|Frequency Coverage||6, 10, 12, 15, 17, 20, 30, 40 meter bands|
|VSWR 2:1 Bandwidth||40M: 150 kHz|
30M: > 50 kHz
20M: > 350 kHz
17M: > 100 kHz
15M: > 450 kHz
12M: > 100 kHz
10M: > 1500 kHz
6M: > 1500 kHz
|Typical VSWR at resonance||1.3:1|
|Power Rating||1500W (PEP) without speech processing|
500W (FM, PSK)
|Vertical Radiation Angle||16 degrees|
|Horizontal Rad||360 degrees|
|Maximum Height||8.7 m|
|Maximum Wind Survival (guyed)||> 128 kmph|
> 80 mph
|Maximum Wind Surface Area||0.23 m²|
|Maximum Mast Size||3.18 cm to 5.08 cm|
1.25" to 2"
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