[Elecraft] Poor Low audio frequency response on JT65 mode with my K3 ?

[Don Wilhelm]

Cliff,

The K3 defaults to a 400 Hz bandwidth when selecting DATA A mode. unless 
you have previously set some other width.

I am not sure about the negative bandwidth values you have indicated, 
but I am going to assume that those are just "dashes" and not negative 
signs.

I suggest you look at the width and shift (or HiCut and LoCut) to obtain 
the filter bandwidth that you desire for digital modes.

When working with a waterfall display, you may want a wide bandwidth, 
but if you are tuning for a single signal with the K3 VFO knob, you will 
want a more narrow bandwidth.

73,
Don W3FPR

On 11/13/2012 7:04 PM, Clifford Hynds wrote:
> Hope someone has an answer,
>
> I am a recent owner of the K3 having just bought a K3, P3 and KPA500
> station from another ham.
>
> Probably you would have to be a regular user of the JT65 mode to notice but
> I seem to get little or no output when I am below about -500hz or so on the
> waterfall on JT65HFand nothing really at -1000Hz, fine from there up.
>
> Probably affect other data modes also ?
>
> I am using line in/out on the K3 and DATA mode so no equalisation,
>
> Had no problems with other rigs FT847,FT817 and TS950SDX had no problems
> with the low end.
>
> Could be as simple as increasing the input capacitor for the line audio or
> as the audio is controlled by the DSP perhaps an upgraded DSP unit. The K3
> is in the < 1000 Serial numbers 718 if i remember not in front of it at the
> moment.
>
> Hope someone has an answer,
> thanks
> Cliff VK2CCJ
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