Re: Elecraft K4 H D

[Charlie T, K3ICH]

What exactly does the Superhet Module added to a K4D actually do?
It's obviously a desirable improvement add-on, but that's about all I know.

I must have missed the explanation if it was provided.

73, Charlie k3ICH






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[wayne burdick]

Hi Charlie,

This is described in the brochure and FAQ.  Basically, there are limits to achievable dynamic range with an A to D converter (direct sampling).  The superheat module improves dynamic range by protecting the demodulation channel with narrow band crystal filters. In particular, blocking dynamic range (BDR) improves by 20 to 30 dB. This may be important for stations that have a nearby high-powered broadcaster, or in a multi transmitter environment.

The HDR module can be turned on when needed, either manually or automatically. When it’s turned off, the K4 will use its normal direct sampling for the demodulation channels. In all cases, direct sampling is used for the panadapters.

73,
Wayne
N6KR


----
elecraft.com

> On May 28, 2019, at 7:55 PM, Charlie T <[hidden email]> wrote:
>
> What exactly does the Superhet Module added to a K4D actually do?
> It's obviously a desirable improvement add-on, but that's about all I know.
>
> I must have missed the explanation if it was provided.
>
> 73, Charlie k3ICH
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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