[Elecraft] New K3 SN#207 built but question on AM Filter

[John W2XS]

I am hoping that Elecraft will have a different option for AM listening by
the time that my K3 arrives (in April).  Perhaps the roofing filter can be
bypassed for AM listening. There are several radios out there that have
DSP-only selectivity for AM reception: RX-320, Jupiter, etc. (Which also
applies to transmitting on those radios).  I purchased the 6kHz AM filter,
but now I realize that the 15kHz FM filter is better suited for
full-fidelity AM listening.  The 6kHz filter may not see much use, even if I
were to transmit on AM.

According to the ARRL web site, 9 kHz is the ARRL's recommendation for
double-sideband AM. A typical AM Broadcast signal's BW is 10kHz.  Passing
these signals through a 6kHz filter will result in a restricted-audio
sounding signal. This is good for AM ham reception on the crowded 75m band
but it is not full-fidelity sounding on AM BCB or SW.

(I have heard some SW stations that must be using a wider bandwidth than
10kHz, based on how nice they sound on an old Hallicrafters radio - the kind
with just the IF transformers for selectivity. Radio China International
comes to mind). 

73,

John W2XS

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