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9.99 kHz:

8.00 kHz:

6.00 kHz:

4.50 kHz:

2.40 kHz:

1.80 kHz:

1.00 kHz:

0.50 kHz:

The 545 also has "AMS" mode, which is called "AM Stereo". I've never tried to tune an AM stereo signal with it. It sounds and looks very much like the standard AM mode at 9.99 kHz, however, with perhaps a little more high frequency audio.

The LOOSE/SHARP filter setting has no apparent effect in AM mode.

AMS Mode:

Here is the 4.50 kHz AM audio with the "sharp" filter option set. I don't see any difference:

Next I ran some tests with the 545 while tuning in the VHF range, to see if the audio looks any different. It does, in fact it looks much "worse". The VHF/UHF unit output is 10.7 MHz, which then feeds into the HF section of the 545. There seems to be more hgih frequency noise, though the low frequency area looks very similar.

Perhaps some noise is being added? Perhaps my test techniques are not fair?

2.40 kHz:

6.00 kHz:

4.50 kHz:

AMS Mode: