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.
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