Recent content by ravioli

Just to let you know, a 25 ohm load has a VSWR of 2.0 in a 50 ohm environment. Not good, but not horrible. What this means is your transmitted power is ~89% or so, or you have about a 0.5dB of transmission loss. Since it sounds like your loss is more substantial, you might be fighting...

My bad, didn't see that. Is this a sweep of the rf device and the amp? If that's the case, is your rf device stable? Also, how are the other S-parameters impacted? I'm going to agree with Antiphon, and I definitely would check on the isolation of your power supply/amps/inputs.

Any way you can get an S-parameter sweep?

You can always purchase the batteries that you feel would fit best in your device from an OEM. From there, put your companies name on it and add a little premium. Then, only support your device with those said batteries (but of course let your battery chemistry be known)...

Since it appears that you are looking to make this into a business, let me give some advice. Get the expertise to get the job done right. Contract out. You will save time(and money) for yourself, and come out with a device that performs better.

Multiplication of complex numbers is easily done with polar format(euler's formula). So whenever you are solving circuits with phasors, it makes your life a lot easier. Sure you can do that without using the polar notation, but you can also solve a complicated AC circuit with basic...

Sorry I pressed submit too soon... Note: There are many more uses of the fourier/laplace transform and mine was just a very very small example.

Have you ever used phasors before? Take the Fourier transform of i=C \frac{d v}{dt}, and rewrite this in the form of Z(\omega)=\frac{V(\omega)}{I(\omega)}. What do you get?

Well, what kind of questions do you have on transistor biasing?

I'm having an issue with seeing the text on all of the items. Can you possibly switch to the PNG format? It is a lot better for text/line items when compared to JPEG. Also can you give the resistor values?

Okay right now you have a differential equation. Can you follow Kirchoff's Voltage Law to determine what that is going to be? I'm not sure at what level you are academically, so I'm not sure if the derivation would be the correct path to go down...

Any work that you've tried and/or relevant equations you could use?

My bad, last statement is iffy. I think it should read if k cubed is even, then k is even

Looks okay to me, unless you were trying to do a proof by contradiction. Your current proof is one of a contrapositive.

a) It's one battery at 9.5V. We have multiple lines like that to represent multiple cells of a battery (one cell usually cannot do 9.5V) b) The 2.2ohm resistors are not in parallel. One way to think about parallel versus series is as follows. Every single straight line is going to represent...