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            my Amateur Radio Antennas

 
(c) DL1DAW

West view of my antennas. On the top of the 13m Versatower the 2m/70cm omni antenna X-50N from DIAMOND is fixed. Both of the bands, 2m and 70cm, can be operated simultaneously by using an indoor antenna duplexer. The antenna gain is 4.5 dBi for 2m and 7.2 dBi for 70cm band.
Below the omni antenna the 3 element rotary yagi beam FB 33 from FRITZEL is doing his job. The antenna gain is 7.7dBi for 20m, 8.2 dBi for 15m and 9.2 dBi for 10m band.
The front-to-back ratio best values for the above mentioned bands are 18, 15 and 14 dB. The boom length is 5.0 m and the turning radius is 4.5m.
For all other bands I use a symmetric multiband dipole 2 x 11m. The centre feeder of the dipole is mounted at a glas fibre mast 11.5 m above ground level and 4 m above top roof. The angle of the beam spread is about 110° ending 10m above ground level.
The flexible antenna wire is from DX-Wire type F 7 x 0.5mm hard copper, tin-plated, PE isolation, section is 1,4qmm. The 9 m symmetric TwinCom feeder cable is from Titanex and has an impedance of 250 Ohm with a cut factor CF of 0.7 and with a power rate of 5kW PEP. The attenuation is only: 0.5dB/ 30MHz/ 100m.
The feeder ends at the symmetric input of the remote controlled matchbox in the loft. After the T- machting network and a 1:1 current balun a coax cable RG213 connects the transceiver.
The remote controlled matchbox and the control unit are made by Hans Bolli HB9KOF and is called SAMS (Swiss Antenna Matching System). It automatically provides optimum matching of the antenna system even in the RX mode of my transceiver (ICOM 756PRO).

 
(c) DL1DAW

   © 2009 by DL1DAW •  dl1daw@darc.de