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The assembly of the Versatower BP60 with OB9-5 / HB9CV (2016)

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The work on the foundation begin ...
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... and the first control.
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Now manual labor is announced and that with very solid clay soil from 20cm depth!
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Here the finished foundation (2000 x 2000 x 1500 mm) after eight hours hard work and +25°C in the shade.
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The 4 threaded rods (M24 x 1000 mm) galvanized and stable welded together.
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The pit and the metal cage (60 kg). In the foreground the galvanized flat steel for the lightning protection of the antenna system.
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After around 30 minutes, is done! The concrete foundation with about 6 m³ of compacted concrete. The strength class of the concrete corresponds to Euro Code 2 is C30/37 !
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After good 3 week wait, I can finally start building the Versatower BP60 ...

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First preparations ... the bottom plate is placed and the lower mast part is mounted ...
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... after about 25 minutes every 3 mast parts are then assembled and the steel cables can be installed.
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The final installed Versatower after 3 1/2 hours of hard work! Here without headboard and rotor up to 15 meters, electric, extended! Next, it's time - build the antenna of OptiBeam OB9-5 and assemble at BP60 ...
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The sort of the component parts of the antenna begins...
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... the assembled antenna to about 2 hour!
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The fully assembled antenna to approximately 3 hours!
A good planning is everything and always pays off! ;-) The exact mounting on Versatower ... 30 kg antenna weight and this without external help! This is really a challenge.
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The 1:1 Balun (W1JR-50-3) in the feed point of the OB9-5!

A special thanks to PA3HGT and ON4VP for all information and images on their website.
This really helped me in advance and saved a lot of time in building the OB9-5!

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After 4 months planning phase and the construction of Versatower with OB9-5 and the HB9CV for 50MHz is almost done! Now only the coaxial cable and the control line for the rotor must be moved from the mast and to the station!

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From Versatower to Radiostation (22 meters) were in 2 PE pipes (40 x 3,7mm) in 60cm deep... 5 coaxial cabel to MIL-Standard (2x RG-213/U, 3x RG-58 C/U), 2 rotor cables (7x 0,75 mm2) and a CAT7 network cabel laid. The station ground, consisting of 20 meters galvanized flat steel with 3 earthing lances has been integrated!
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... and this is my Antenna here ... below the OB9-5, about the HB9CV for the 6-meter band!
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... a view to the Tower! In the background the T2FT antenna...
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... and a view from different perspectives of the now extended mast with the antenna.

It's finally here, and you can hear again ...

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Now I hope to many nice QSO worldwide ... See you soon and '73 from SA2BFO!

Finally, the technical specifications by the manufacturer...

  Model OB9-5   9 element, 5-band
  Band   20 17 15 12 10
  Gain (dBd) ∗   4,3 4,5 4,7 4,5 4,5
  Gain (dBi) ∗∗   11,7 12,0 12,3 12,3 12,3
  F / B (dB)   18 20 25 25 25
  Elements (number)   9
  active elements per band 2 - 3
  Element Length (m/ft)   10,94
  Boom length (m/ft) 5.1
  Turning radius (m/ft)   6,03
  Supply line (number) 1 coaxial cable with 50 ohm
  Weight (kg)   30
  Wind load at 130 km / h   578 N - 0,72 m² - 7,8 feet²
               
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Matching for the antenna YAESU-Rotor, Model G-2800DXA

* = average gain over dipol in free-space / for comparison: 2 el monobander 4 dbd, 3 el 5-6 dbd
** = average gain at 20m above ground (= dbd + 2.15 db isotropic + about 5 db ground reflection)

More information on the manufacturing side of OptiBeam Antennentechnologien 

My special thanks go to Tom (DF2BO) for the really great antenna and the good support!

VSWR-measured values OB9-5

  VSWR   acc. manufacturer
  14,00 - 14,19 - 14,35   1,3 - 1,0 - 1,2
  18,07 - 18,13 - 18,17   1,4 - 1,1 - 1,3
  21,00 - 21,25 - 21,45   1,6 - 1,1 - 1,6
  24,89 - 24,94 - 24,99   1,4 - 1,2 - 1,3
  28,00 - 28,50 - 29,00   1,6 - 1,2 - 1,5
  VSWR   my measurements
  14,00 - 14,15 - 14,35   1,3 - 1,0 - 1,2
  18,07 - 18,13 - 18,17   1,2 - 1,1 - 1,1
  21,00 - 21,25 - 21,45   1,6 - 1,1 - 1,4
  24,89 - 24,94 - 24,99   1,2 - 1,2 - 1,1
  28,00 - 28,66 - 29,00 - 29,70   1,4 - 1,1 - 1,2 - 2,3

Antenna 15 meters above ground!

Measuring technology

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Measuring device - miniVNA PRO

The antenna for the 6-meter band ...

Model HB9CV   CA-52HB
Frequency range (MHz)   50-52
Gain (dBi)∗   6.3
VSWR   1.5:1
Transmission power (watt)   200
Connection cable (number)   1 coaxial cable with 50 ohms
RF jack   SO239
Element phasing:   2
F/B (dB)   >24
Boom length (m)   0,80
Max. element length (m)   2,97
Turning radius (m)   1,54
Weight (kg)   0.91
Wind load at 126km / h   0.054 m²
Mast mounting (mm)   25-65
HB9CV_SWR.png

More information on the manufacturer's website from COMET ANTENNA - JAPAN

∗ = Average gain over a dipole in free space

The VSWR diagram from my HB9CV-50MHz ...

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