Typical, found the answer about 30seconds after hitting send - I had turned the 
AGC off whilst trying to measure the noise figure on the transverter……

73

Paul
M1CNK

> On 11 Oct 2025, at 21:49, Paul Wilton <[email protected]> wrote:
> 
> Hi
> I recently had my K3 apart to add the 2m transverter module.  However, I have 
> now found that the Noise Reduction button is showing as N/A if my mode is USB 
> or LSB.  It works fine in AM and CW.
> 
> Any idea why this is the case?  I pretty sure it worked in USB and LSB 
> previously.
> 
> 73
> 
> Paul
> M1CNK

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