Per-Tore,
Yes it is correct. He stated that it is the impedance at the rig end of
the feedline.
That will not likely be the feedpoint impedance of the antenna. That
impedance can be found if you do the calculations for the impedance
transformation of the feedline (for which the length of the feedline
must be known).
73,
Don W3FPR
On 7/31/2014 4:23 PM, Per-Tore Aasestrand wrote:
Hi Matt,
Of course you realise that the output impedance of the ATU will be the
complex conjugate of the impedance at the rig end of your feedline.
I wonder if this is correct
IMO, the task of the tuner is to make the tx happy, so it can look into the
load it is designed for. Thus, it will translate the impedance as seen from
the antenna connector into something as close to 50 ohm as possible. The
tuner will not change anything on the feeder. With or without the tuner,
the feeder will have the same VSWR.
Per-Tore / LA7NO
On 31 July 2014 22:02, Matt VK2RQ <matt.vk...@gmail.com> wrote:
Of course you realise that the output impedance of the ATU will be the
complex conjugate of the impedance at the rig end of your feedline.
However, if you want to know the impedance of your antenna, you need to
realise that the feedline is acting as an impedance transformer, and you
need to take into account factors such as length of feedline, frequency of
operation characteristic impedance and velocity factor of the feedline,
etc..
73, Matt VK2RQ
On 1 Aug 2014, at 1:02 am, TF3KX <kristi...@gmail.com> wrote:
Thanks. Yes, I can determine the tuner settings (L/C-values, etc.) and
from
the network equations derive the impedance these settings match into. It
would be neat if the K2 had enough CPU power and memory to carry these
calculations out for me and just display the R+jX. Perhaps a good project
for a small program or an app...
73 - Kristinn, TF3KX
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