I know that feeling!
Another question: Is it still a MOSFET (like the Omni C) or did they
make the change to a higher emitter current BJT such as the 2N3886
(like the Argosy 1 second revision) or 2N5109 (like the Argosy 2)?
It seems like TT were fiddling with the designs in the early 1980s
making incremental improvements.
73
Kevin
On May 20, 2007, at 1:21 PM, Duane - N9DG wrote:
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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--
N7WIM / G8UDP
Kevin Purcell
kevinpurcell@pobox.com
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