[SADXA] Fwd: Re: [Elecraft] Elecraft K4 H D

[Wes]

For those who want to know more about the Elecraft K4, some words from the designer.



-------- Forwarded Message --------
Subject: 	Re: [Elecraft] Elecraft K4 H D
Date: 	Wed, 29 May 2019 09:30:51 -0700
From: 	Wayne Burdick <n6kr at elecraft.com>
To: 	Charlie T <pincon at erols.com>
CC: 	elecraft at mailman.qth.net



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 <pincon at erols.com> 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
>