Hello
,
While
I
was
waiting
for
my
K3
to
arrive,
I
have
been
doing
some
experiments
with
the
Softrock
Lite
.
The
softrock
lite
is
an
amazingly
good
rx
for
its
11
$.
I
was
interested
in
a
panoramic
display,
so
I
tried
it
out
on
the
TS-850
.
With
a
35.362
Mhz
Xtal
and
Rocky
software
that
was
not
much
of
a
problem.
It
worked
just
fine.
For
the
K3
,
I
ordered
a
32.812
Mhz
Xtal
.
I
read
here
that
more
isolation
is
needed
to
prevent
the
oscilator
signal
(
8.204
Mhz
in
my
case)
to
go
back
to
the
K3.
Someone
suggested
the
use
of
a
HCPL-4562
.
First
I
measured
at
the
input
of
the
Softrock,
with
the
TS-850
and
found
a
strong
S9
carrier
at
8.204
Mhz
With
the
HCPL-4562
in
front
of
the
Softrock,
I
was
able
to
hear
the
carrier
on
the
input,
but
no
indication
on
the
S-meter.
That
should
be
enough
isolation,
I
think.
Then
I
added
an
extra
stage
.
I
copied
the
schematic
from
the
K2
preamp
with
a
2N5109
to
give
the
signal
from
the
IF
an
extra
14
db
or
so
and
extra
isolation.
I
still
could
hear
the
carrier
,
somewhat
quieter,
and
see
nothing
on
the
S-meter.
The
whole
thing
is
built
into
a
metal
box
and
shielded
between
the
different
stages,
and
an
extra
shield
between
the
HCPL-4562
input
and
output.
The
connection
between
the
K3
and
the
adapter
is
a
short
coax
cable
with
two
bnc
plugs.
When
changing
from
xfil1
to
xfil2
and
xfil3
on
the
K3,
I
noticed
a
shift
in
the
display,
so
I
made
three
different
entries
in
the
rocky.ini
file:
in
the
[Band]
section
I
added
:
FL1=8625
FL2=9700
FL3=9630
I
had
to
experiment
with
these
values
until
the
signal
was
at
the
zero
mark
on
the
scale
.
One
important
thing
I
overlooked
was
the
fact
that
you
need
the
KXV3
interface.
It
was
only
when
I
was
building
the
K3
that
I
realised
that...
:)
I
have
no
special
soundcard,
I
use
the
on-board
soundcard
of
my
pc.
It
works
fine
with
Rocky,
I
haven't
tried
any
other
software
(
yet
).
73
de
on5ao
K2
# 5237
K3
# 0324
jo
benoit
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