Posted by
Karl Larsen on
Aug 14, 2006; 7:00pm
URL: http://elecraft.85.s1.nabble.com/Up-conversion-tp392867p392887.html
Dave G4AON wrote:
> Having an FT857D and TS570D, when I compare the CW performance of my K2
> with them, the K2 wins every time. Due in no small part to the narrow
> "roofing" filter inherent in a single conversion receiver, the good and
> quiet solid state change over and the low noise receiver.
>
Hi Dave, if you bought the 500 Hz Collins mechanical filter for your
FT-857D, then the K2 and this radio are very close in performance on
both CW and SSB receiving. I am going with this from the ARRL
measurements done in QST and available to members. The FT-857D is a good
quiet solid state change over and a low noise receiver.
> On SSB the differences are less, especially if I ignore the FT857D as
> it's quite "hissy" on receive. The TS570 isn't a bad performer on SSB
> and has nice sounding audio.
My FT-857D is not "hissy". I'm trying to think what you might have
set wrong to cause this to occur?
73 Karl K5DI
> My K2's SSB unit is an early one and has a
> nominal bandwidth of 2.2 KHz. Compared to the wider bandwidth of the
> Kenwood, it will sound more restricted. Add the basic K2's power
> limitation of 10 Watts, which has more of an impact on SSB than CW, then
> it's no surprise the K2 tends to get less of an enthusiastic review when
> compared on SSB.
>
> 73 Dave, G4AON
> K2 #1892
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