[Elecraft] ATU and Bandpass Filter

[Don Wilhelm]

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?
>
>