Lane,
Yes, you cannot do that.
We are only discussing the need for the filter to have a 50 ohm
non-reactive load.
So if you are using a bandpass filter designed for a 50 ohm load (most
are), then you need to use resonant antennas.
What I was saying is that slight variations from a 50 ohm load may be OK
("fine tuning" the load), but many so called multiband antennas do not
meet that criteria.
Try measuring the feedpoint impedance of a G5RV antenna on various
bands, and you will see that it varies considerably.
73,
Don W3FPR
On 6/23/2017 9:37 PM, Lane wrote:
I think I'm missing something here. I'm not sure I understand putting
the ATU after the filter since the ATU is internal. How does one put
it after the external BP filter?
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