I say BPF first, then preamp (at least for LF/MF work). Strong out
of band signals can cause all sorts of problems. Best to filter them
before amplifying. I believe the small amount of loss in a good BPF
is insignificant at low frequencies. I have found this to be true
using my LNV antenna.

http://www.n1bug.com/lfmf/LF_MF_Receiving_System.png

73,
Paul N1BUG


On 03/16/2018 07:36 AM, Chris Wilson wrote:
> 
> 
> Hello  LF'ers,
> 
> Been  Googling and see a mixed response to should a receive pre-amp go
> before  or after a BPF. I have mine before the pre-amp, does the panel
> concur with this being correct? Thanks!
> 
> Aerial,  isolation  transformer  for  ground  loops, BPF, pre-amp, Red
> Pitaya as the LF receiver.