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Testing my 5 band 10-12-15-17-20m Spiderbeam antenna



Testing version 5bands Spiderbeam antenna 10-12-15-17-20m
Page 5/5

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Photos 501 and 502
Close-up view of the antenna handy rotating system. A threaded rod goes through the penultimate aluminium telescopic tube and the 2 copper rings, located on both sides of the threaded rod, are based on the top of the aluminum tube to reduce wearing surface during direction changes.

Photo 502

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Photo 503

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Photos 503 and 504
The 12mm diameter copper rod fits perfectly onto the threaded rod of the antenna rotating system. To rotate the antenna, simply loosen the large stainless clamp and operate the lever in one direction or to another one.

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Photo 505

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Photo 505
Pulley for hoisting the 2 dipoles for 40m and 30m bands. The electrician clamping rings have been tripled since early February 2009.

Photo 506
The screwdriver, above the guying aluminium plate, is temporarily used as an anti-slip system to avoid upper telescopic tubes to slide down, prior to insert the wingbolt 10cm lower and so to get unscrewing and screwing faster. This bolt is hand tightened to avoid the upper aluminium tubes turning in gale force winds.

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Photo 507

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Photos 507 and 508
All guying has been reviewed and corrected, white 6mm halyards now replacing old fishing nylon line (187kg) which was in 2007 the previous guying system. Stainless steel shackles are not superfluous at all, I am living at about 400 meters from the seafront and the spray comes up to my home.

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Photos 509 and 510
On the left picture, guying nylon line (187kg) used in 2007 year, the right picture shows 2009 guying ropes made of 6mm halyard more resistant to traction and weather.

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Photos 511 and 512
Same observation for these guying anchoring points, the 6mm halyard is really the most adequate material offering a best grip.

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Photos 513 and 514
We can see, on Picture 14, galvanized chain lengths to adjust rope tension, in order to make settings easier by moving link after link.

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10m driven element fixed on the boom

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10m parallel feeding line

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12m driven el. ahead of 10m driven el.

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12m parallel feeding line

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17m 20m and 15m connections

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All band connections to Balun box

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20m driven element on the boom

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17m driven element fixation

1 year after its initial installation, here is my 5bands Spiderbeam

Monday, 08th of November 2008


1 year after its initial installation, here is the 5band version Spiderbeam. Measurement, on FK8DD Spiderbeam were performed with antenna at 15m above ground level by using MFJ-259B analyzer and MFJ-941E Watt/SWRmeter.


20m band
SWRmeter varies a little bit on phone band till 1.5 at about 14250Khz.
20m Bandwidth, without antenna coupler: 250 kHz
14000 khz => SWR: 1.1----------> 14100 khz => SWR: 1.2 ---------> kHz 14250 khz => SWR: 1.5

17m band
Adjustment of this band will be made during next maintenance.
18068 khz => SWR :1.5 ----------> 18120 khz SWR: 1.7 ----------> 18168 khz SWR: 1.5

15m band
15m Bandwidth, without antenna coupler: 300 khz
21000 khz => SWR: 1.2 ----------> 21200 khz => SWR: 1.3 ----------> 21300 khz => SWR: 1.5

12m band

12m Bandwidth: 100kHz
24890 khz => SWR: 1.1 ----------> 24990 KHZ => SWR: 1.2

10m band
SWRmeter does vary a very little bit when going up to Phone band.
10m Bandwidth, without antenna coupler: 700 kHz
28000 khz => SWR: 1.1 ----------> 28350 khz => SWR: 1.2 ----------> 28700 khz => SWR: 1.5


Below, SpiderBeam technical caracteristics according "Spiderbeam Team"


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Spiderbeam at 1,50m on the roof

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Another view of Balun box

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17m, 20m and 15m feeding lines

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10m and 12m feeding line

Photo 527

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17m driven element fixation

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17m parallel feeding line

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17m and 20m connections

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Balun box clamped to central post

Photo 531

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Kevlar guying point to central post

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1,50m High easy access to the Spiderbeam

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Spiderbeam in the bush !!

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Waoo, a big grasshoper !!

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