K3 AM filter (on receive) question

[Edward R Cole]

One of the reasons I bought the 13-KHz filter was to process wide
band audio baseband for use by spectrum sw, but it appears the
"modes" limit this if I understand correctly.  Example in FL1
(13-KHz) I am only able to reach 4-KHz in USB.  Same goes for DATA-A
max bw is 4-KHz.  AM - 5 KHz, FM (not adjustable) presumed to be 13-KHz.

Of course I have implemented use of the LP-Pan which replace the K3
2nd IF with a SDR which is bw limited only by nyquist and soundcard
capability (currently 96 KHz).


73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ   500 KHz - 10-GHz   www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-100w, 1296-60w, 3400-?
DUBUS Magazine USA Rep [hidden email]
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[Barry N1EU]

Edward R. Cole wrote

One of the reasons I bought the 13-KHz filter was to process wide
band audio baseband for use by spectrum sw, but it appears the
"modes" limit this if I understand correctly.

What limits it is a 4Khz low pass filter that all the audio passes through, independent of mode.

Barry N1EU

[Joe Subich, W4TV-4]

 > What limits it is a 4Khz low pass filter that all the audio passes
 > through, independent of mode.

The limit is in the audio DSP - you will see the maximum cutoff even
on the Line Out which does not pass through the analog (op amp) LPF
in the headphone/speaker channel.

73,

    ... Joe, W4TV


On 8/15/2011 12:55 PM, Barry N1EU wrote:

>
> Edward R. Cole wrote:
>>
>> One of the reasons I bought the 13-KHz filter was to process wide
>> band audio baseband for use by spectrum sw, but it appears the
>> "modes" limit this if I understand correctly.
>>
> What limits it is a 4Khz low pass filter that all the audio passes through,
> independent of mode.
>
> Barry N1EU
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-AM-filter-on-receive-question-tp6688286p6688331.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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[DL5OCD]

The response on FM is from 400Hz-2700Hz, just measured it with my spec. It is also DSP limited.
I think there is room for improvements.

73
Michael