[Elecraft] Field Day rig experience

[Jim Brown]

On 6/12/2018 4:50 PM, Robert G Strickland wrote:
> A small nit... perhaps my ignorance... but, I think that the roofing 
> filter [by whatever name] comes after the first mixer, at the 
> so-called IF frequency.

A month or so ago, as part of a project to measure input Z of receivers 
and preamps, I measured the 2nd RX of my K3 as 50 ohms and with a 
bandpass filter between the antenna input and the 50 ohm load. Clearly, 
in the K3, there is a "per band" bandpass filter ahead of the first RF 
stage.

73, Jim K9YC