Did you ever wonder why?
They "stated" 45watts, is based upon - what type of system, product, item or just plain old "Meter" to state that claim?
(or the Spectrum used to state such - might be a touch wider than many are left to believe)
Truth is, they don't - or at least show, with any sense of honesty what they used to make such a claim.
The truth hurts, but to really put this in a given perspective...
I find a truth based upon the events leading up to it's arrival on your doorstep - can be found on the side of a box of cereal...
This Product is sold by Weight, Not By Volume.
Some Settling Of Contents may have occurred
during shipping and handling.
I cannot lay claim or even give you the reasons why the power they state doesn't seem to appear on many meters - it's not a universal "gimmie" either.
Welcome to radio...
Now as far as the "drive" - take a look at the radio and begin the tune up process - if you have a scope it would be a big help. at least you can find where the weak points are...
Let's also look at current draw from the power supply to help us determine if there is any true "45 watts".
One effect you may have already noticed is the accumulated power ability is affected by the Trimmers for the Final - and you also know what the results of that effort get you closer to recreating the problem all over again - just for "gain" - Yes power will go up but the laws of diminishing returns starts to appear.
So you know the thing is widebanded - and if adjusting the trimmers up (increasing voltage) makes the radio increase power - ok let's get out the old coffee napkin while were here at the table and figure out what is occurring when you raise the voltages on the Gates...
Part of this problem is the "capacitance" you have to overcome at the same time use - to shove RF in there - on top of that we also have to tweak the voltage arriving so that just RF is in the MOSFETS Linear region. Between the two - we also have to have enough to transition from off to on - the linear region "moment".
I call it moment because you can look at this in the electrical as well as physical standpoint - being electrical you can apply power to it and make it do things - the physical being that it is a switch with a given physical characteristic of being able to switch power on and off easily enough.
But in both realms - its' not moving so we have to look at the Electrical as a atomic - physical event - but also a FIELD event to force a state from of to on as a transition but in doing so, there is these - moments - where the device appears as a linear switch. The way it does this is using a field, but also the physical presence of power as a force - not as a current but as a voltage.
So let's work on this process ...
You can read along by opening this in a separate tab on the browser if so equipped...
https://www.worldwidedx.com/threads/cobra-29-ltd-classic.260992/page-3#post-754762
To keep this simple and so I can celebrate what is left of Thanksgiving with my Wife...
The key to this approach is two fold.
One Main one, is idealizing the MOSFET so it gives the stage the best transfer from input to output - these use open loop gain so the gain being the quality of output following the quality of input. Give the best to it and it is possible to get the best out of it.
The Second, is dealing with the Stages preceding (Upstream) and subsequent (Downstream) - that has to be optimized so the signal transfer can be made with the least amount of losses (like skewing and clipping/saturation and remembering that the previous stage is using a Bipolar Linear device.
So where's the problem? IN all of it.
So before we proceed - to optimize the design will seem a bit of substitution and perhaps a little more of when if that worked let's do this - more of an experiment than a true tested theory and making it stick.
Again, 45 watts can be the light in lumens it produces or the amount of heat it produces when you try and talk to other people with it - onto it takes 45 watts to operate the pretty lights...
