[ICOM] Icom "Dual Watch" feature and the Balance Control

[John Geiger]

In one of the earlier QST product reviews-either for
the 781 or the 775-there is a very good explanation of
how the dual watch architecture is implemented in the
Icom radios.  Given what was said in the review, it
didn't sound possible to split off the audio into left
and right channels.  

I just got an Icom 756 (original) about 2 months ago. 
It is my first radio with dual receive capabilities,
and that feature is awesome for DXing.  The balance
control may not be as good as being able to send each
receiver to a different ear, but it still beats the
heck out of just single receive.

73s John NE0P

--- Adam Farson <farson at shaw.ca> wrote:

> Hi Don,
> 
> The Icom Dual Watch architecture was not the result
> of any
> patent-infringement concern, as far as I am aware.
> It was a practical
> compromise dictated mainly by cost factors. The IF
> outputs of the two 1st
> mixers are actually combined in the analogue domain
> by a combiner following
> the A and B 1st mixers. The IC-781 was the first
> Icom HF transceiver with
> Dual Watch.
> 
> The IC-7800 has a true dual-receiver architecture
> with separate RF inputs
> and baseband outputs, allowing "stereo" and
> diversity reception. This
> configuration is not in breach of any patent I can
> think of.
> 
> http://www.qsl.net/ab4oj/icom/dw.html
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>  
> 
> 
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