Recent content by VivaLaFisica

This is to transmit a live video feed that can be viewed at a remote location. How does the cable affect my seen image? What can I expect with one of your suggestions? I ended up taking horizontal and vertical measurements with a 10db gain horn antenna on my spectrum analyzer. Plugging in some...

That's actually a helpful suggestion. It certainly removes the most risk of radiating in any enclosed space where testing is done. My concern stems from "how do we safely test this in-house before we apply it operationally?"

I'm using the power density equation, PD = (R*4pi)/(G*W^2) Where R is the received power, G is the antenna gain and W is the wavelength. I should be focusing on the received antenna gain and not the antenna gain through transmission, right? That 11db I gave earlier is irrelevant in this...

At this point, there isn't a standard setup of mounting the antenna. At its worst, another individual would be holding the antenna (yes, with their hand). Otherwise it'd be mounted at a height that puts the lower end of the antenna at head height. The cables used are RG59. Maybe I'm being...

Thanks for all the input. The antenna is something like this: https://southwestantennas.com/omni-antennas/stc-flange-mount/omni-collinear-dipole-array-22-25-ghz-11-dbi-flange-mount-1085-084 In the meanwhile, I've been looking at some power density equations and actually walking a spectrum...

It's an Omni-directional antenna. I know receivers are picking up the signal at many spots around the point of transmission.

I'm curious to figure out if I'm operating a transmitter with safety compliance regarding its HERP (Hazards of Electromagnetic Radiation to Personnel). Put simply, the transmitter has a low and high output capability of 2w and 10w. The antenna it operates on has an 11db gain. Radiating around...

Also consider the directions of your accelerations. Which way does g point? What's the direction of the mass' acceleration as it's being pulled by the cable?

" By the graph above, and this one http://hiwaay.net/~bzwilson/prius/pri_bsfc_010.jpg We can see that a car actually uses less fuel at 2000 rpm than it does at 1000 rpm. Since the engine spends the same time through all RPMs of both gears, the energy the motor puts out remains CONSTANT...

Someone said the following and it just doesn't sit right with me. How do I effectively tell them what's wrong here? " It applies to physics the same, as can be seen with the Kinetic Energy Formula Ke = 1/2MV^2...

I'm trying to think about what it is I should be considering before I start throwing up some maths. I'm thinking to assume that the positively charged core is a point charge +e and the electron is uniformly distributed over a sphere of radius Rs. The self energy of the electron...

I'm adding this because I think it's an important point to make, too: If the person on the truck were to just drop the ball then the ball would have a speed of 0mph relative to the truck and 60mph relative to the ground.

As far as we know, an electron cannot be decomposed into angular momentum of constituent parts. So how am I suppose to be thinking about what "spin" is? I've come across intrinsic angular momentum explanations, but I'm not really satisfied with that and am still a bit stumped.

I'll try harder, uncle Paul -- I promise! But really, this tensor business is boggling me.

Given two ionic cores, i and j, can someone please explain what it is that's happening as the distance between them decreases? What is its significance?