[Elecraft] ATU and Bandpass Filter

[Matt Maguire]

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.

73 de Matt VK2RQ

> On 23 Jun 2017, at 1:13 pm, Lane <software.research.development at gmail.com> wrote:
> 
> A question about the K2. Taking it to the club for FD and I have a
> bandpass filter (CF-20) which says "Never use radio's internal tuner
> with filter."
> 
> I have the internal ATU installed. Is there a way to bypass that? Or
> should I just use the "main antenna" jack (manual says never use if
> ATU installed) on the bottom left, instead of the two midway in the
> middle?
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