Oooopsie, I miss read my schematic. They are actually MBD
101's too. I'm road weary from the long drive back from
Dayton. The take away lesson is: Don't read schematics when
tired.
Duane
N9DG
--- Duane - N9DG <n9dg@yahoo.com> wrote:
>
> 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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