[1000mp] Roofing filter observation, A=B test

[Jan Erik Holm]

Was the NB fixed in both radios?

73 SM2EKM
-----------------------------------------

Tõnno Vähk wrote:
> Just a quick note on my roofing filter observations:
> 
> I have two MPs both so far with IF mods. All filters in and mostly identical in all measurements.
> 
> So I had the opprotunity to install roofing filter into one instead of IF mod and do A=B testing.
> 
> 1. I did not notice signal strength change. I think I have both set to 12 in 9.x menu and they were still identical. 
> 2. I did not find any strong enough signals close enough to cause any 3rd order IMD products so I did not see any difference in signal clarity, cutting splatters or anyhing like this. I guess I have to wait for contest for that.
> 3. What I did notice for sure was remarkable HISS REDUCTION. The backround noise was constantly about 1-2 S-units lower on all bands. Quite remarkable. The receiver is more quiet. What actually seems like an ordinary band noise was noticably lower. 
> 
> I am satisfied:)
> 
> 73
> tonno
> es5tv
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