Joe,
Re "perhaps loser cost parts": A Freudian typo? :-)
Phil W7OX
On 5/12/15 4:25 PM, Joe Subich, W4TV wrote:
On 2015-05-12 5:45 PM, Fred Jensen wrote:
I believe the KAT3 tuning algorithms are
contained in the K3
firmware which Elecraft does not disclose, so
the MFJ gizmo must have
begun with a reverse engineering effort, always
a very dicey
undertaking under the best of conditions.
Nothing dicey about it ... MFJ doesn't even need
to know anything
about the tuning algorithms or controls. The K3
CPU controls both
the tuner L/C values and the antenna selection
via a serial bus
and series of serial to parallel shift
registers/latches. The only
"engineering" MFJ needed to do was copy
Elecraft's KAT3 schematic.
The only "value engineering" is to do what
Elecraft does at lower
production costs and perhaps loser cost parts.
The real question is the ethics (and legality)
of copying Elecraft's
schematic. The only way the MFJ tuner works
properly is if it copies
the L/C values and controls exactly.
73,
... Joe, W4TV
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