Elecraft KFL1-2 User Manual
Page 2
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www.
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•
831-662-8345
Assembly
To assemble the KFL1-2
,
r
e
f
e
r
t
o
t
he
Fi
l
t
e
r
Boa
r
d
a
s
s
e
mbl
y
i
ns
t
r
uc
t
i
ons
i
n
t
he
K1
Owne
r
’
s
Ma
nua
l
(
pa
ge
s
11-16).
Note: On page 12, the manual refers to the Per-Band Components Table in the parts list, App. A. Use the table on
page 1 of this instruction sheet rather than the table in the manual parts list.
Even if you plan to use the KAT1 antenna tuner, you should install the jumper at J2 as described in the manual. The
jumper can be removed later when you install the tuner.
It is important to label both the original and new Filter boards with the two bands covered, as described in the
manual. If you do confuse the two Filter boards, you can look at the crystal frequencies to identify the bands covered.
Installing or Swapping Filter Boards
Swapping filter boards takes just a couple of minutes, using the following steps.
Re
move
t
he
K1’
s
t
op
c
ove
r
(
f
our
s
c
r
e
ws
)
.
Di
s
c
onne
c
t
t
he
s
pe
a
ke
r
c
a
bl
e
(
not
a
ppl
i
c
a
bl
e
wi
t
h
KBT1
opt
i
on)
.
If you have installed the KAT1 antenna tuner, remove the associated screws and unplug it from the Filter board.
Remove the existing Filter board in the K1 (1 or 3 screws, depending on whether the KAT1 was installed).
Install the desired Filter board and secure it to the RF board with 3 screws (just the center one if using the KAT1).
Turn on the K1. Tap the
BA N D
switch twice, quickly. You should hear some relays switching when the band
changes. If not, you may have either the relays or the microprocessor on the Filter board installed incorrectly.
Use the
B x
menu entry to specify which two bands are now in use. (This step must be repeated any time you swap
Fi
l
t
e
r
boa
r
ds
.
)
Re
f
e
r
t
o
t
he
K1
owne
r
’
s
ma
nua
l
,
pa
ge
39
(
Band Assignments) for details.
Alignment
If you installed a KAT1 tuner in your K1, you were instructed to move K1 RF board jumper P3 to the "KAT1"
position. Return it to the "K1" position for Filter board alignment. Note: If you have an older K1 (rev D. RF board or
earlier), there is no jumper P3. Instead, re-solder the lead of R36 that you unsoldered when you installed the KAT1.
Make sure that you have a jumper installed on the Filter board between pins 2 and 10 of J2, as explained on page 15
of the K1 manual. If you have already installed a 10-pin connector at J2 for use with the ATU, insert a temporary wire
jumper between these two connector pins. Use #24 solid bare hookup wire.
Align the band-pass filters on each band in receive mode (K1 manual, page 40, Band-Pass Filter Alignment).
Calibrate the operating frequency on each band us
i
ng
t
he
me
nu’
s
C AL
/
O P F
menu function. See page 41 of the
manual (Operating Frequency Calibration). Note: The calibration data for up to four unique bands is stored in
nonvol
a
t
i
l
e
memor
y.
Thi
s
me
a
ns
you
won’
t
have
t
o
r
e
-do
C AL / O PF
when you exchange boards.
Re-peak the band-pass filters on each band in transmit mode (page 46, Preparation for Transmit Alignment).
Setting up Filter Boards for use with the KAT1 Antenna Tuner (if applicable)
Remove the jumper installed at J2 on the Filter board. Make sure all solder is cleaned out of the two holes used.
Install connectors J1 and J2 on the Filter board as described in the KAT1 manual. (The antenna tuner kit comes with
an extra set of these connectors.) J1 is a single-row, 3-pin female. J2 is a dual-row, 10-pin female. The connectors go on
the top side of the Filter board.
Move jumper P3 on the RF board to the "KAT1" position. Note: If you have a rev D or earlier K1 RF board, there
is no P3. Instead, locate R36 on the RF board, near the antenna jack. Unsolder and lift the lead of R36 nearest the jack,
but do not remove the resistor completely.
Plug the KAT1 module into the Filter board, and follow the operating instructions in the KAT1 manual.