[Elecraft] K3 FM filter required for full AM receive width

[Stewart Baker]

Why not an LC filter for AM reception instead of an expensive 
crystal roofing filter ?

73
Stewart G3RXQ
On Mon, 05 May 2008 08:29:29 -0600, KM5Q wrote:
> My widest filter is 2.8. I am allowed to widen the DSP to 4. So 
why
> not in AM, for BC receiving, be allowed wide enough for high 
fidelity,
> without a roofing (or xmit) filter? (AM can be widened to "10", 
but it
> sounds narrow and muffled)
>
> I get much better bandwidth (fidelity) now using SSB to receive 
AMl,
> but it makes noisy band-browsing because of all the heterodyne 
noise.
>
> Windy KM5Q  K3 764
>
>> How can you have an IF bandwidth wider than 6KHz without using 
a
>> filter
>> that's wider than 6KHz?
>>
>> -----
>> Julian, G4ILO  K3 s/n: 222 K2 s/n: 392
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