I don’t know weather it was from there or not, the sumo guys got oiled up, it was certainly better than the 3w, the 1w smart kit that just buzzed and seemed to be related to buzzbee berkby. The ferrite beads from the 4w kit were the only things I knew what they did, they used the beads before the positive and negative rails on the nrg limiter and the pll, transistors could of worked I suppose in a veronica/nrg pll. Its interesting there could of be a use for the components, in something that would of worked better.

Albert H wrote: ↑Wed Sep 03, 2025 2:14 am Other surveillance projects included "Laser listeners". The basic one used by UK Plod was infra-red, and had to be aimed straight at the target window.

I’ve seen videos were in the past were they would aim laser at a window, telescopic thing they made in their garden, saw something were someone used a solar panel to recieve an audio signal with much interference from the florescent lights maybe it was over infra red, interesting because its using light to send a signal. We are surrounded by remote controls, dosent take much to think they could be used to send audio too, over the same wavelenght. I did find it interesting learning about the electromagnetic spectrum, finding out that some of electro magnetic waves are visible but some are not. I did think about having a play around making an infra red sender a while ago, just to see how it sounds, I think i'll leave the gamma wave experiments to someone else.
I kind suspect, that in the past maybe lasers weren’t available, you’d be using a lense to narrow the beam width which sent the signal further, impractical to have it set up, the telescope thing does make me think of a christmas commercial, with a dog looking through it, maybe best left to them.

When we had noisy neightbours I became more interested in noise cancellation, its only possible using earphones, you would picking up the sound vibrations from the window, inverting it to match cancel out the waves, impossible to do with speakers, (the noise can only be masked) I suppose if you had flexable windows maybe they could do it, too far fetched, someone did try to make a device that attached to a window, I assumed this was taking advantage of people suffering an awful blight. …There are some speakers are directional too, I suppose is quite interesting as you can’t hear any sound if your off angle.. it couldn’t replace someone earphones on their phone though, it would have to outside their pocket infront of them for it to work. There was talk a few years ago everything in the home would be powered wirelessly, the efficiency of it wasn’t very good its quite sad, I though it was a pretty cool idea, a kettle can’t boil itself. i’ve decided I won’t go and make a ionic lifter, or get large reel of mains lead to mess about with this. I suppose sometimes something isn’t practical it can’t be done, I suppose there wasn't much linking over infra red..

A couple of London stations tried infra-red links in the 80s, but they were largely impractical, especially with birds flying through the beams, interrupting them! It was much easier to build VHF and UHF links. I mostly used Band IV because there was plenty of spare bandwidth available between TV channels, and because very high gain directional aerials were cheaply available in any hardware shop! Using TV Yagis meant that your link aerial wouldn't be obvious, amongst the forest of TV aerials on every building!

Someone could use a dummy aerial, a vertical, on top a tv aerial not connected to the mast, it wouldn’t look out of place I suppose, they're better hanging a skull and crossbones to the top, leaving the caravan aerial on the caravan. I’m sure years ago I connected a tv aerial I think only the stronger stations came through on fm, you were meant to disconnect the lead during thunderstorms I don’t think anyone did that, your meant to disconnect stuff from the electricity too, a lot of messing, were quite lucky we don't get many. Would be interesting to know what happens when lightening hits the tv aerial, older crts they were more scary, there would be a lot of smoking, a case of spontaneous combustion. like a commercial for hamlet gone wrong