[ICOM] Icom 7300 Dither signal question

[John Geiger]

Thanks, I will have to read that.

73 John AF5CC

On Mon, Jul 24, 2017 at 2:25 PM, D. Jones <djoneses at verizon.net> wrote:

> Dithering is commonly used in ADCs to improve dynamic range.  See this
> excellent write-up at Analog Devices website http://www.analog.com/
> en/analog-dialogue/articles/adc-input-noise.html
>
> -------- Original message --------
> From: John Geiger <af5cc2 at gmail.com>
> Date: 07/24/2017  1:37 PM  (GMT-05:00)
> To: ICOM Reflector <icom at mailman.qth.net>
> Subject: [ICOM] Icom 7300 Dither signal question
>
> I am trying to figure out exactly what the Dither signal involves for the
> 7300 when the IP+ is turned on.  Here is what the QST review says about it:
>
> "The IC-7300 has an IP+ feature, which
> inserts a dither signal when you activate it.
> You could say this is somewhat like adding
> a strong signal off frequency, which has the
> clever effect of reducing the intermodulation
> distortion (IMD) products. The dither
> signal is noise and it raises the noise floor a
> bit."
>
> To me that sounds like putting a strong signal off of frequency to cause
> some blocking and desense of the receiver, which would reduce the
> sensitivity (raise the noise floor).
>
> Is my interpretation of this even close to being correct?
>
> 73 John AF5CC
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