[Elecraft] K3 AM Performance

[Joe Subich, W4TV]

On 2015-03-23 10:41 PM, Harry Yingst wrote:
 > Where is the 4.5 on Receive, Is in in DSP or the Audio chain?

Both.  The maximum hi cut one can set in the DSP is 4200 Hz and
there is a 4-pole Chebyshev analog audio lowpass filter (-6 dB
at about 4500 Hz and -40 dB at about 10 KHz) between the ADC and
headphone/speaker amplifiers on the DSP board.

See: http://www.elecraft.com/K3/mods/K3_DSP_LP_Filter_Install_Rev_A.pdf

73,

    ... Joe, W4TV


On 2015-03-23 10:41 PM, Harry Yingst wrote:
> Where is the 4.5 on Receive, Is in in DSP or the Audio chain?
>
> I enjoy listening to SW and I have the AM and The FM filters and
> though it sounds OK a little more Bandwidth (on receive) would be nice.
>
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>        From: "Joe Subich, W4TV" <lists at subich.com>
>   To: elecraft at mailman.qth.net
>   Sent: Monday, March 23, 2015 10:03 PM
>   Subject: Re: [Elecraft] K3 AM Performance
>
> --- snip ---
> Other than the apparent offset between Sync-L and Sync-U, the K3 does
> a pretty fair job of supporting AM TX and RX within the limits of the
> 6 Hz AM filter.  The question is whether they should bother to support
> wider AM ("Enhanced AM") to 4 KHz audio bandwidth as they do with ESSB.
> --- snip ---
>