Diamond D3000N

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srcejon
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Diamond D3000N

Post by srcejon »

I recently installed a Diamond D3000N Super Discone Antenna on my roof.

Image

It's specified as being usable for 25-3000MHz for receive and 50-1200MHz for transmit (200Watts at 144MHz), with a gain of 2dBi, so seemed like a good choice for general SDR usage.

Here's what I measured for S11 using a E5061B VNA, from 20MHz to 3GHz (S11 of -10dB is around a VSWR of 2):

DISCONE_ROOF_FULL_AVG.PNG
DISCONE_ROOF_FULL_AVG.PNG (46.32 KiB) Viewed 186 times

And zoomed in at 28MHz:

DISCONE_ROOF_28MHZ.PNG
DISCONE_ROOF_28MHZ.PNG (54.73 KiB) Viewed 186 times

50MHz:

DISCONE_ROOF_50MHZ.PNG
DISCONE_ROOF_50MHZ.PNG (52.1 KiB) Viewed 186 times

70MHz:

DISCONE_ROOF_70MHZ.PNG
DISCONE_ROOF_70MHZ.PNG (52.17 KiB) Viewed 186 times

137MHz:

DISCONE_ROOF_137MHZ.PNG
DISCONE_ROOF_137MHZ.PNG (53.95 KiB) Viewed 186 times

144MHz:

DISCONE_ROOF_144MHZ.PNG
DISCONE_ROOF_144MHZ.PNG (59.93 KiB) Viewed 186 times

430MHz:

DISCONE_ROOF_430MHZ.PNG
DISCONE_ROOF_430MHZ.PNG (53.87 KiB) Viewed 186 times

1090MHz:

DISCONE_ROOF_1090MHZ.PNG
DISCONE_ROOF_1090MHZ.PNG (50.95 KiB) Viewed 186 times

1707MHz:

DISCONE_ROOF_1707MHZ.PNG
DISCONE_ROOF_1707MHZ.PNG (54.17 KiB) Viewed 186 times

Seems to work quite well. So well in fact, the need for filtering becomes more apparent!

Not much good for satellites though, so far, presumably because the radiation pattern has a null vertically upwards, as can be seen in this Matlab Antenna Designer plot (which isn't for the exact antenna, just an approximation)

DisconeRadiationPatternMatlab.PNG
DisconeRadiationPatternMatlab.PNG (60.05 KiB) Viewed 186 times
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