Tag Archives: equipment

Exhibition Wireless word – Jozef Murgaš

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From 1st to 14th november was exhibition „Wireless Word“ dedicated to 150th anniversary of birth Slovak invertor, artist and priest Jozef Murgaš. We operated special callsign OM150MURGAS at exhibition place and promoted hamradio. Thanks for the contacts, QSLs via OM5CD.

 

Repeater installation at Kamzík tower

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We helped with installation of 145MHz repeater OM0OVV at TV tower Kamzik in Bratislava. It works very well now. More info at Tony’s repeaters webpage. Thanks for help to Tóno OM1AEG, Filip OM1AI, Marek OM8AS, Miška OM4CX, Ondro OM4DW, Dodo OM1VL.

Ondro OM4DW

Linked dipole for SOTA

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​This is short description of my SOTA antenna – Linked dipole. It is common dipole with jumpers, so you can choose band. See pictures below.

sota_dipol

Wire is copper 0,5mm2, center part and insulators made of plastic and jumpers are 2mm banana plug. Dimensions come from simulations in K6STI software and in practice are the same. It supposed invered-vee shape, center about 8m high and thin wire but those parameters are not critical.  Minimums SWR are about 1.2 and should be in bands. Listed length for 7 MHz is for CW, if you prefer SSB cut last sections approx. 14 cm. Other bands have good SWR in whole band.

Dipole should have BALUN in feedpoint but I think it is not necessary for SOTA use. Coax cable is thin and light RG-174. 

Ondrej OM4DW