Total posts : 45366
… It also appears that a helical antenna needs to be frequency-spec-tuned at build time. A helical receiving antenna could be much more broadband than a TX antenna … correct?
That means each transmitting helical coil antenna would have to be more or less hard-tuned to the frequency of choice. I guess peak resonance could then be achieved with a large (low resistance) limited-range variable air cap.
Am right about any of that, or am I imagining things from outside the park?
For my part, the reason for all of this inquiry into cage monopoles and helical antennas is because it’s way past haul-out time for my boat (home and floating transmitter shack). It”l be out for at least a week, but I want very much to stay on the air during that time.
That means I must come up with an efficient transmitter with nowhere near the available RF grounding I have now. It’ll have to be at my studio, which has no dirt surface, and, worse, it’ll have to be right in front of the building, because the landlord won’t allow me to attach anything to the tile roof.
There is a 25′ x 100′ island with turf (well, it’s not been properly cared for and mostly dandelions now) in the middle of the parking area, but I’d have to dig up asphalt (also a no-no) to get wires out to it, or build a totally wireless system … which I don’t want to spend $$ on right now (other priorities, extremely limited funds).
I could drive a couple ground rods between the asphalt and the concrete walk area that butts the building, but that’s about it.
Still looking for other solutions … TIA …