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DF2BO Germany flag Germany

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I was born December 05th, 1959. With 13 I got in contact with amateur radio and in the age of 16 I got my license. I always was and still am very much interested in dx contacts. Furthermore my passion is the designing of short wave antennas. In June 2001 I founded the company OptiBeam Antenna Technologies, and nowadays OptiBeam belongs to the more well known and bigger antenna manufacturers world wide. Since May 1999 I am married to my wife Diana who also works for OptiBeam.














-> Combined office room and shack at the OptiBeam factory with DF2BO                     ->  The world's best 8 band antenna set up on a 36 meter/120 feet high rotating LUSO36XXEU

-> From here the operational business is done                                                                     at OZ8X: OB804030x / OB21-3 / OB9-2WARC at 36,00 / 27,70 / 19,50 meters

-> And of course from here radio operation is performed

-> The location of the OptiBeam factory is in D-75417 Mühlacker (40 km = 25 miles west of Stuttgart)


Antenna set up at the OptiBeam Factory Station

OptiBeam OBLY19-5 at 23 meters = 75 1/2 feet

-> 19 elements / five band 20-17-15-12-10m high performing Log Yagi / fed by a single coaxial feed line / close to 4el monobander performance

    on all five bands / parasitic reflector on 20m + parasitic duoband director on 10-12m (also partly works on 15m) / 17el arranged in terms of

    a high gain wide spaced log cell / boom length 15.00 meters = 49 1/3 feet

    (normally it is a 20el design with 19 driven elements, this 19el system here at DF2BO is a special case to interlace the 30m reflector)

=> while usual logPs

     - do not have enough elements

     - have too short booms

     - are limited by a stiff mathematical logarithm

     - and use a lossy high impedance phase line

=> OptiBeam Log Yagis (diverse models are available) have

     - a high design factor (low per centage of length difference between the elements) = many elements

     - an extremely high efficient and high gain log cell design by breaking out of the stiff mathematical logarithm, i.e.

       element per element is optimized iteratively until the overall performance on all bands reaches the absolute maximum

     - an optimum boom length for the log cell area considering the amount of elements

     - a performance enhancing parasitic element for the lower frequency ranges which even positively interacts on all bands

       and which is spaced with an optimum distance from the log cell

     - a gain enhancing, loss free, low wave resistance phase line

     - absolute stability regarding gain and pattern accross all bands + low SWR

     = = = > for more details please check the OptiBeam web site !


OptiBeam OB2-30 at two levels: driven element at 25 meters = 82 feet / reflector at 23 meters = 75 1/2 feet

-> 2el high Q coil shortened 30m monoband Yagi / driven element in between the OB8040s and the OBLY19-5 /

     reflector interlaced at the rear of the OBLY19-5 boom (for optimum take off and lowest SWR)


OptiBeam OB8040s at 27 meters = 88 1/2 feet

-> combo of a 2el 80m and a 3el 40m monoband Yagi / interlaced on an 11.45 meters = 37 1/2 foot boom / 2 separate coaxial feed lines

-> 80m: element length 18.40 meters = 60 1/3 feet / shortened by high Q coils plus a hairpin end loading /  

             usage of the OptiBeam 4 step multi switch system to cover SSB in three segments -each 60 khz wide-plus 60 khz on CW

-> 40m: element length 14.80 meters = 48 1/2 feet / shortened by high Q coils



=> all OptiBeam antennas see www.optibeam.de



the new OptiBeam 80m multi switch system

->this new 80m multi switch systemis installed at the centre of each 80m element, consiting of the relay box and two high Q loading coils

-> inside the relay box 3 high quality relay pairs = 6 relais in total, connected correspondingly to a defined amount of coil windings, allow a four step

    switching, 3 x SSB + 1 x CW, each segment about 60 khz wide

-> the control unit in the shack has to be connected to a 24 Volt source and a four wire cable (+ shield) has to be runup to the antenna

-> the system can handle up to 10 KW

=> see www.optibeam.de


Prosistel PST110D

-> 240 kg (528 lbs) antenna weight + 50 kg (110 lbs) mast weight and a wind load of around 5 m2 (54 feet2) are turned by the PST110D

-> the PST110D is the newest and strongest rotator in the Big Boy Rotators line, twice as strong as the famous PST71D

=> see www.prosistel.net


7655523 Last modified: 2016-10-25 17:57:44, 9227 bytes

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