I have just been playing with an antenna analyser that I borrowed from Mold and District Amateur Radio Club and finding out how the resonant frequency of a VHF beam alters with the height off the ground and its polarization. This is of particular interest to SOTA operations as getting the beam over 30 feet above the ground makes a massive difference compared to getting it 20 feet off the ground, even on top of a mountain. Turning the beam vertically alters its resonant frequency quite a lot and a beam tuned for 144 may be resonant outside the band (141-143 in my tests) when vertical. Mounting a vertical beam upside down made the antenna almost impossible to tune, which may explain problems some of us have had from time to time on summits. All fascinating stuff, as I am sure you will agree, but I don’t think 35 foot SOTA poles are going to catch on somehow and I haven’t added one to my Christmas list. However if Mr Clause is reading this I would love my own antenna analyser, please.
If you could have something radio or SOTA related for Christmas what would it be and why?
Please keep it sub £500 no Pro IIIs or “My own mountain”.
Seasons Greetings Steve GW7AAV
PS If I am getting socks make them walking socks.