On Mon, 2007-05-21 at 08:50 -0700, Kevin Purcell wrote:
> Is the behavior the same on the Corsair 1?
>
> This is an interesting (if odd) result. Especially as it is an
> important issue for comparing IMD DR and other numbers (which is what
> I'm doing). Sherwood (et al) will turn off a preamp (fair enough) but
> they won't turn on an attenuator (fair enough too, because it doesn't
> affect the IMD DR just moves the useful range up in).
>
> So when the control is "interestingly" (mis-)labeled like this one
> then that would "mess up" their standard measurement setup.
>
> <http://www.w8ji.com/receivers.htm>
>
> 73 Kevin
> N7WIM
Perhaps I mis-wrote. Its not really an optional preamp but the entire RF
stage that is unhooked connecting the antenna directly to the mixer.
Some might consider that the normal RF stage, not a preamp. On 75
meters, mine is disconnected most of the time. Need the additional
dynamic range on the top end afforded by reducing the RF gain before
that first mixer. I can't find my Corsair II manual this evening to
check on that attenuator detail.
73, Jerry, K0CQ
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