Rob,




On 20/07/2020 10:29, Rob wrote:
BTW. I always had the idea that skin-effect was only important for
frequencies of VHF and higher, not for HF.

So according to you the use of litze wire in medium wave (1 MHz) radios
was a waste of effort?
You seem to have a lot of strange ideas...

Well, what did you expect? I'm just a ham.
You know: for 90 % no idea what I am doing as I am just an operator and
for 9.9 % "no idea why it is like that, but that's what they told so it
must be correct".
I'm just trying to fill that 0.1 % of *really* understanding the
technology I am using.



Usually, I am more into DSP, SDR, data-communication, signal-processing,
GNU Radio, etc.
Signal processing is based on numeric representations of voltages
(amplitude and phase), either the time or frequency-domain, at one
particular place in the circuit.

The most interesting part of this discussion here is that it requires me
to think in a different way that I am used to do, so this discussion is
very interesting to me.


The problem is that, saying "the skin-effect also has an effect" but
without really quantising it does not really help.


I still do not have an answer to my question:
Are there figures of how much resistances the skin effect adds to a
wire, in respect to the frequency? (Just to get an idea of the scale of
things)

Say for a very basic HF antenna-system: 10 meter coax, balun,
full-length dipole for -say- the 40 meter band, designed for 100 Watt RF
power.

Can you put some numbers of the impact of the skin-effect on this kind
of system?





73
kristoff - ON1ARF