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Author Topic: Diamond X510NA Antenna VSWR  (Read 705 times)
N1DDU
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Posts: 1




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« on: January 21, 2006, 07:42:34 AM »

Diamond X510NA Antenna VSWR

Hi, I had done a fair amount of research prior to purchasing the X510NA. It arrived yesterday and the spec sheet that was packed with the antenna indicated that the VSWR is lowest (1.1) at 147 MHz. The VSWR at 146 is 1.4 and probably higher in the 145 and 144 sections of 2M. Is there anyone who has experience with this antenna and can comment on its performance on FM in the 145 section of the band? Is there a drop off in performance?

Thanks,

Jim
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WB2WIK
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Posts: 20547




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« Reply #1 on: January 21, 2006, 07:01:03 PM »

No, there isn't.

The X510NA and other similar antennas are narrower bandwidth than their commercial counterparts because the radiators and phase delay lines internally are very small diameter conductors, about #18 gauge tinned wire.

A Stationmaster, by comparison, uses conductors that are 20 times larger diameter to accomplish the same goal.

But other than this, the X510NA is pretty good.  You absolutely *can* adjust its center frequency for peak performance if you wish; loosen the coupler setscrews and pull the radiator elements out of the couplings a quarter inch or so, then re-tighten.  Doing so lowers resonance about 500 kHz.

WB2WIK/6
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