[Premium-Rx] Racal 6790/GM

[Rob & Terri Sherwood]

I have 3 kHz Collins LSB/USB in my Racal 6790/GM, in addition to a 2.1 
kHz crystal symmetrical filter, plus the standard Racal 3.24.  To me, 
the only significant difference is the bandwidth differences of the 
three choices, 2.1, 3.0 and 3.24.  Except in rare cases, the modest 
differences in shape factor and filter resonator type are 
insignificant.  The flexibility of the LSB/USB pair is nice, especially 
when used with an external synchronous detector on AM.  Push a button 
and you have flipped sidebands without retuning. 

GandalfG8 at aol.com wrote:

> Hi Keith
> I've always preferred separate filters for USB and LSB.
> The shape factor of a "proper" SSB filter is specifically tailored for 
> the appropriate sideband so, theoretically anyway, should give a 
> better audio response than a symmetrical filter.
> Having said that, my 6790 came with just the single symmetrical SSB 
> filter fitted.
> I've been intending to "upgrade" it for some time but have to admit 
> that it sounds fine to me as it is.
> That could just be my dodgy hearing of course:-)
> On many sets you don't have much choice anyway, as the offsets are 
> predetermined, so the ability of the 6790 to detect what's fitted and 
> make use of it accordingly is quite a nice bonus.
> regards
> Nigel
> G8PZR
>
>
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