Total posts : 45366
I wish I had more time … these topic threads are much more than I expected when I first posed the question.
I think the Isotron, in particular the custom one for AM band, designed with Part 15 in mind, is a essentially a kind of open-air tank circuit isn’t it? In this case, the upper element is like a top hat, and the lower one sort of replaces a ground radial setup. Together they look like they will concentrate RF energy through the coil into the radiator while also providing a return path, all in the same unit.
I have to get some better broadcast gear for our remote broadcasts, e.g., headset mic combos and portable booth stuff … Gyms produce very loud slapback sound reflections, which we need to reduce all that background noise. Otherwise, I would be thrilled to get an Isotron and try it out. No time to design and construct one myself either.
When I haul out and fix up my boat (or get another one that will have to be inspected) I may try it. I was just hoping to get a handle on what will work, because I may need it when that happens, since the boat won’t be in a viable position to broadcast from during that time.
I will hopefully have a second floor bedroom of a house on my friend’s property. The house was a sneak-build back in the days when you could get away with such things on this island, but now it can’t legally be rented out until the current building codes are met … more than they can afford at this time. However, it’s apparently OK for “storage”.
As mentioned, I’ll mount the TX in the attic right under the antenna system on the roof. The only available ground will be from the PS and audio link from an online STL computer. Protection will be a simple spark-gap from antenna to heavy ground wire. Not much lightning around here, even in the peak season for it in August … long ways off from now.
With the weather like it is today (off/on hard rain and 60mph wind gusts … I’ve lost signal 5 times) I also worry about the viability of an Isotron as they appear to be perhaps too frail to handle severe outdoor weather conditions.
Any further comments regarding these items is welcome, but, interesting as all this stuff is, I don’t want to stray too far from the original topic. Boat has to come out soon, maybe even before the basketball season is over.
ASIDE: We’ve broadcast 8 away games (football and basketball) remotely with simple equipment, have a fair number of game to game and premium-level season sponsors. Next up is another tournament series (we have 2 games) live at the Yakima SunDome Dec 28, 3:00pm, Dec 29, 10:00am. Looks like we’ll be with the team at a motel overnight.