[Elecraft] Wider bandwidth while listening to AM SW on the KX3?

[Andrew Robertson]

It’s true that, in the USA, the sidebands will be 5 KHz, at the absolute maximum, which means that I am missing at most about .8 KHz of audio at the very most.  However, in the shortwave bands (above MW BCB) there are many broadcasters using 12 to even 15 KHz of spectrum these days.  China, Cuba, Russia, and others have all adopted a very hi-fi sounding very wide bandwidth in the past few years.

I use the same speakers for all my listening with different radios so it’s not likely that this is the issue.

Thanks.

-Andy KE7TMA

On Nov 1, 2013, at 7:31 AM, dave <ho13dave at gmail.com> wrote:

> 
> The audio bandwidth of an AM radio station is something less than half the separation between stations on the dial. In the EU that separation is 9 kHz and in the US that is 10 kHz. So the max bandwidth one can hear on AM - at absolute most - is 5 kHz. Remember that AM is double sideband. The audio energy is both above and below the carrier (USB and LSB). The audio passband is approx half the RF bandwidth used.
> 
> If the KX3 has an audio passband of ~ 4.2 kHz then you are effectively missing nothing in terms of bandwidth.
> 
> If some other radio 'sounds' better that is likely due to listening to a different speaker with different freq response.
> 
> 73 de dave
> ab9ca/4
> 
> 
> 
> On 11/1/13 5:25 AM, Andrew Robertson wrote:
>> While I do enjoy the AM SWL capabilities of the KX3, I would really
> like to be able to appreciate a more hi-fi sound from the unit.  I
> do know that that roofing filter XFIL1 is probably the ultimate
> limiter (I believe it’s 15 KHz?  or 10?) but I think the DSP
> filter in software is actually what is reducing my bandwidth
> to 4.2 KHz.  Since it is in software, I am hopeful that, perhaps,
> a future software update could provide a wider bandwidth or even
> shut off the DSP filter completely (pass-through mode).
>> 
>> I’m sure I’m not alone in using my KX3 as a SWL rig, and I hope
> that consideration could be given to this suggestion.  Thanks
> Wayne and Eric and the rest of the gang at Elecraft for a
> superb product!
>> 
>> -Andy KE7TMA
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>