[TenTec] On Noisy Transmitters

[Ken Brown]

Thanks Rick, I understand what phase noise is. I work on phase locked 
loops and look at the signals they produce with spectrum analyzers 
almost daily. And I understand why transmitters that do not use phase 
locked loops do not produce any, or at least very little "phase noise." 
Whatever noise they do generate we would give a different name. I am 
sure that transmitters using no phase locked loops are not perfect. They 
will have some amount of noise due to ripple in their power supplies or 
just plain thermal noise in oscillators and amplifiers. Boltzmann's 
constant is a constant, so is not zero, T in every transmitter I have 
worked on is at least 273 K, so the physics says there will be noise. 
The noise may be small, but not zero. It would be interesting to have 
some real measurements.

DE N6KB

> Ken, the noise we are talking about is called "phase noise" and none of
> these radios had any phase noise (by design).
>
> 73 - Rick, DJ0IP
> (Nr. Frankfurt am Main)
>
>