Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Grant Youngman wrote:
"Grant Youngman" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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The only difference between the 4 kHz and 6 kHz filter with
the synchro-phase AM detector is the selectivity.
I had both filters, and always thought the radio sounded better with the 4
Khz than the 6 Khz. Both were in the radio, and I always chose the 4 Khz,
with a little PBT cranked in as the better sounding option. YMMV.
Grant/NQ5T
Grant -
Well, like I said, you trade fidelity for selectivity.
If you want maximum communications efficiency, then the 4 kHz is
certainly better. If you want to listen to music, then the 6 kHz is
probably better.
The PBT allows you to listen to whatever "part" of the received audio
spectrum you want to hear, so if you like music with a heavy bass or
lots of treble to compensate for natural hearing rolloff, - OR - a
restricted range speaker or phones, - OR - ...
That's why they make different b/w filters! :-) There is even an 8
kHz version! Or you can use the resistor in place of the AM filter and
have the ~ 9 kHz b/w of the roofing filter.......
73, Garey - K4OAH
Atlanta
Drake B & C-Line Service CDs
<http://www.k4oah.com>
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