I use an SDR-IQ on the i-f output on my (very) early K3S.  it works fine.  IIRC, always a dubious proposition, I did the mod on my original K3 and it worked well too without any additional amplification.  I think you have another problem.

Wes  N7WS

On 10/3/2019 2:01 PM, Fred Massey wrote:
Good afternoon,

I have successfully connected my QSR-1 to my K3s if-out, and immediately
noticed the signal strengths showing on the QSR-1 were much weaker.  I
probably have an early K3s, so the if-out signal strength is even weaker.

Any recommendations at a good preamp to use?  It seems like 20db is what I
need:

73,
Fred
AE4ED

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