[Elecraft] K3: DSP Bandwidth Limit

[Don Wilhelm]

Jim,

It is important to realize that the K3 bandwith is equal to the audio
bandwidth.  The K3 reports the audio bandwidth.

A K3 with a 6 kHz filter is limited to a maximum of 3 kHz audio because 
an AM signal is double sideband and the IF bandwidth for the AM signal 
must be twice the audio frequency of the filter.

So an IF filter of 6 kHz is required to obtain an audio frequency of 3 kHz.

The DSP frequency band is in the audio spectrum while the IF filter is 
in the RF spectrum.  There is a 2:1 relationhsip in the bandwidth. For 
an IF bandwidth (the filter bandwidth) of 6 KHz, the expected audio 
bandwidth (shown by the K3S audio bandwidth) is limited to 3 kHz.

Yes, the audio bandwidth displayed can go up to 4000 Hz, but little will 
be heard above 3000 Hz with a 6 kHz filter usd for AM.

73,
Don W3FPR

Fn 12/13/2019 8:58 AM, Jim Stoneback via Elecraft wrote:
> Is there any way to expand the (receive) DSP maximum bandwidth beyond 5kHz in AM mode?  I have the 13 kHz roofing filter installed.
> 
> 73,
> 
> Jim K4AXF
> K3 #4936
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donwilh at embarqmail.com
>