Looking at the orignal Corsair mamual I have it shows the
first mixer being made from 4 discrete MPN 3404's. As far as
I know the CII's all used the monolithic quad.
Duane
N9DG
--- Kevin Purcell <kevinpurcell@pobox.com> wrote:
> Excellent. Thanks Steve for that data point. And Don, NN8B,
> who
> replied too. Both have the Corsair 2.
>
> So they had switched by 1986.
>
> Anyone with an original Corsair (Corsair 1, so to speak)? I
> think
> that might be the rig they made the switch to schottky
> diodes.
>
> It would just take a second to check the schematic in the
> manual on
> the RF Mixer board :-)
>
> They won't be MPN-3404 PIN diodes (which appear in fours in
> the
> Corsair too) but something else.
>
> I'm sorry I didn't mention the quad option too (so people
> go hunting
> for 4 diodes) as it is similar to the digital Argosy RX
> mixer.
>
> > TT will use either four discrete diodes (probably
> switching diodes
> > if they were still using them but they may be discrete
> schottky
> > didoes) or, more likley, a single quad schottky package,
> as they do
> > in the 525D Argosy digital which is an ND487CI.
> >
> > Does the RF mixer board have a ND487CI on it?
> >
> > Or a similar 4 legged package between a pair of
> transformers and
> > taking signal from the LO via a driver?
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