19
4-Band Transmitter Alignment
This step depends upon the revision of your K1’s RF board. The revision is silkscreened on the board.
Perform only the following step for the RF board in your K1:
a)
If your K1’s RF board is revision E or later, move the RF DET jumper (on 3-pin header P3) to
the K1 position.
b)
If your K1’s RF board is earlier than revision E, and if you installed a KAT1 tuner in your K1,
you were instructed to unsolder one end of R36, which is on the RF board near the antenna
jack.
You must re-solder this lead of R36 in order to align the 4-band filter board in
transmit mode.
Remove the Filter board temporarily to gain access to R36.
Complete the
Preparation for Transmit Alignment
steps on page 46 of the owner's manual (right
column).
Power output must be set to
2 . 0
watts to provide good sensitivity to trimmer adjustment.
If you have an external wattmeter (preferable analog), connect it between the K1 and the dummy load.
An analog meter will provide a more sensitive indication than the K1's built-in digital wattmeter.
Review the trimmer capacitor locations for each band (Figure 11).
Switch to the
10 MHz
band. Set the VFO to about mid-band.
Note:
The K1 can be placed in TUNE mode by holding the
W P M +
and
W P M -
switches together. During
TUNE, the power in watts will be shown on the LCD (e.g.,
P 2 . 0
). Hitting the key or pressing any switch
except
W P M +
and
W P M -
will cancel TUNE.
If the output jumps up to well above 2 watts during
alignment, exit TUNE mode, then re-enter it again.
(For an explanation of how transmit ALC works, see
footnote 3 on page 47 of the K1 owner's manual.)
Put the K1 into TUNE mode. Adjust C5, C6, CE and CF for maximum power output, then exit TUNE.
Switch to
7 MHz
and set the VFO to mid-band.
Put the K1 into TUNE mode. Adjust C7, C8, CG and CH for maximum power output. Exit TUNE.
Switch to
18 or 21
MHz and set the VFO to mid-band.
Put the K1 into TUNE mode. Adjust C1, C2, CA and CB for maximum power output. Exit TUNE.
Switch to
14
MHz and set the VFO to mid-band.
Put the K1 into TUNE mode. Adjust C3, C4, CC and CD for maximum power output. Exit TUNE.
If a separate receiver is available, you can verify that the K1 is transmitting on the correct frequency.
Connect a 3' (1 m) length of wire to the receiver's antenna jack.
Do not connect the receiver directly to the
K1.
Switch the K1 and the receiver to 10 MHz. Key the K1 and locate its signal with the receiver, then re-
peak the appropriate trimmers while watching the receiver's S-meter. Repeat on each band.
Set power output to
5 . 0
watts using the
O U T
menu entry, then exit the menu. Enter TUNE mode
briefly on each band. The wattmeter should indicate approximately 5 watts.
