NY4M:
>which filter would produce the highest transmitted audio fidelity
Probably the 2.7 because it is actually slightly
wider than the 2.8 and has a wider shape factor:
Filter 6 dB BW 6/60 dB Shape Factor
2.7 2.91 kHz 2.9
2.8 2.89 kHz 1.6
>It seems the 2.8 is a higher quality filter, because it is an Inrad
They could all be Inrad. What you care about is in the data above.
>but wouldn't its steeper skirts tend to "pinch" the transmitted audio?
True, but out-of-band distortion products might also be less.
>I suspect there would be little discernable difference.
I think that's correct. Stick with the stock 2.7 kHz
save $90 and get a high quality microphone.
73, Bill W4ZV
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