Elecraft K1 - Manual (Page 54)

E
LECRAFT 53
Calibration Functions
The F L x , B x , C A L , and S I G menu entries are typically used
during initial test and setup of the K1. B x and C A L are also used
whenever you plug in a different Filter module to allow the K1 to
display the correct frequencies.
Crystal Filter Bandwidth Selection (FLx)
The K1 provides three crystal filter bandwidths, FL1, 2, and 3,
which are selected using
X F I L during normal operation. By default,
the filters are set to about 800, 400, and 250 Hz. You can change
these settings using the F L x menu entry.
To modify the bandwidth for a particular filter, enter the menu and
scroll to F L x (where x is 1 , 2 , or 3 ). Use
X F I L to change the menu
entry to the desired filter. Hold E D I T , then tap W P M + / W P M - to
select one of the available bandwidths, in Hz. The bandwidth
settings are approximate.
The BFO is not programmable. One setting of C20 on the RF board
is used for all filters (see page 40).
Band Assignment (Bx)
This menu entry is used to tell the K1 firmware what bands your
Filter board covers, allowing the
B A N D switch and VFO to display
the correct frequencies. You should set up B 1 and B 2 (as well as B 3
and B 4 if applicable), then do VFO calibration using C A L .
The B x parameter can be set to any band from 1 . 8 to 2 8 . 0 MHz,
corresponding to the components on the Filter board. Some of
these bands may not available from Elecraft, but can still be used if
you obtain the necessary components.
On 30 meters, you have a choice of two different band edges,
corresponding to your selected VFO range (see page 12). Hold
D I S P L A Y to select either 1 0 . 0 or 1 0 . 1 MHz.
Operating Frequency Calibration and VFO Test (CAL)
This menu entry is used to calibrate the operating frequency
display, or to align the VFO. (VFO test and alignment is covered in
detail on page 38.)
To calibrate the operating frequency: Switch to the band to be
calibrated and tune in a signal at a known frequency. Then select
C A L in the menu and hold
E D I T . You'll see O P F briefly, then the
operating frequency will be displayed to 100 Hz. The last digit
flashes as a reminder that you're in calibration mode. Use
W P M +
and W P M - to set the reading to match the known frequency.
Note: Each band must be set independently since they use different
crystals on the Filter board.
To check the range of the VFO: After holding E D I T , hold D I S P L A Y
to switch to O S C . The display will then show you the MHz and
kHz portion of the VFO frequency, alternating about once per
second. Turn the VFO pot all the way in both directions to check
the range. Holding
D I S P L A Y again will switch back to O P F
(operating frequency calibration display).
S-Meter Calibration (SIG)
To check the S-meter zero setting, use D I S P L A Y to switch to S-
meter mode, make sure the attenuator is OFF, and disconnect the
antenna. With no signal, the S-meter should indicate 0 bars, or the
first bar may just be flickering on. If not, you can use the S I G
menu entry to change the L x x parameter. After each change to
L x x , hold
E D I T to exit the menu and return to the S-meter display
to see the effect on the S-meter reading.
To check the S-meter full-scale setting, re-connect the antenna and
tune in a very strong signal. If the S-meter's reading appears to be
too low or too high for the given signal strength, use the S I G menu
entry to change the H x parameter. (To get to the H x parameter,
hold
D I S P L A Y while the L x x parameter is displayed.) Reducing the
Hx parameter value will increase the S-meter reading.