In the following video, I have tuned both the Tecsun PL-880 and the PL-660 to a relatively local AM station (880 kHz). Note that I had the tone control switch set to “bass” on the PL-880 (it would have been better on “treble”):
For normal AM radio listening, I believe the PL-880 produces better audio fidelity than the PL-660. I will try to record a weak medium wave station this evening, if time allows.
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I think by “relatively local” you mean distance, not strength. 🙂 I noticed the dBu meter indicating about 36-39, and could hear a bit of noise behind the signal. 🙂
In comparison, my much-smaller Tecsun PL-606 indicates about 45 dBu on 640-KFI at 99 miles, and 47 dBu on 1070-KNX at 111 miles. Neither of them are considered “local” stations here, but have nearly clear signals on a good radio away from electrical noise. 🙂
As for locals, I have 760-KFMB at 72 dBu, 1130-KSDO at 75 dBu, and 1170-KCBQ at 81 dBu, plus several others over 60 dBu. How does the PL-880 behave with the stronger locals? 🙂
Mine PL-398mp dBu meter showed the similar readings. 89 or 90 dBu will appear while you see the antenna insight in front of you. Maybe PL880 dBu scale is quite similar. https://swling.com/blog/2013/12/hidden-feature-adjusting-the-tecsun-pl-880-muting-threshold/ will find the exact calibration dBu readings of PL310 against HP8920 in AM, FM mode.
I haven’t seen any data on the size or orientation of the MW antenna in the PL-880 – does anyone know?