The simple answer is yes they do . . .
No filters . . .
122.100 – in the air traffic frequencies . . .
And no – I don’t remember what I was looking for here . . .
And the same frequencies with filters in line . . .
After changing the antenna routing the DX Patrol MK4 just is not “happy” with the signal – it just is not doing as well below 30Mhz as the Airspy HF+ Discovery. BUT. I didn’t pick it up for low frequency – bought it for satellite freqs. Once I get settled in the new radio room at the new compound and get some antennas up – then I will explore the satellite stuff.
But to answer YOUR question – yes, filters do make a difference in the scheme of things – they do help eliminate “artifacts” or spatter that you get across the bands from broadcast band interference.
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