[Elecraft] ATU and Bandpass Filter

[Don Wilhelm]

What Matt said is true.  However, if your antennas are close to 
resonance, go ahead and use the ATU to "touch up" the tuning.

If you are trying to use a multiband antenna such as a G5RV and such, 
you might as well forget the advantage of the bandpass filter.

Our local club discovered that multiband antennas were a major problem 
at multi-transmitter Field Day sites.  We now use single band dipoles, 
and yes we use a bandpass filter for each of the FD bands.

73,
Don W3FPR

On 6/23/2017 4:35 AM, Matt Maguire wrote:
> The problem is that the filter is designed to work with a 50 ohm characteristic impedance (ie. with a 1:1 VSWR). This means you need to put ATU *after* the filter, not before, otherwise the filter will not work properly.