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Re: LF: Pre amp *after* BPF??

from [Andy Talbot] [Permanent Link][Original]
To: LineOne <[email protected]>
Subject: Re: LF: Pre amp *after* BPF??
From: Andy Talbot <[email protected]>
Date: Fri, 16 Mar 2018 11:54:09 +0000
Cc: Chris Wilson <[email protected]>
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After, definitely

Before is applicable to VHF and up where equipment noise figure dominates sensitivity and a filter in the antenna side wold add loss and degrade overall NF

At HF and certainly LF, atmos noise dominates to noise figure is unimportant.   That way you get the benefit of rejecting strong OOB signals that may stress even the preamplifier

'jnt


On 16 March 2018 at 11:36, Chris Wilson <[email protected]> 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.

--
Best regards,
 Chris                          mailto:[email protected]



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