ELECRAFT K4 - RECEIVE

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Note: If you haven't updated in a long time, and you notice any
unusual behavior, it's a good idea to do the update a second time.
This is because the update program itself may have changed. The
second update attempt will take advantage of any improvements to
the updater.
General problem with transmit and/or receive: Many problems can
be caused by low power supply voltage or by a noisy or intermittent
supply. Consider using a linear rather than switching supply if your
antenna or power cables are picking up supply noise. Check your
power supply’s on/off switch, voltage, fuses (if applicable), and DC
cabling. The K4 provides both voltage and current monitoring in the
time/date/status area of the LCD.
Note: The KPA4 module has its own 25 A, 32 V DC Fuse fuse. The
recommend replacement is Elecraft E980427 (Littlefuse part number
0287025.PXCN or Digikey F4195-ND).
Also see the TRANSMIT and RECEIVE troubleshooting sections, below.
General problem with software behavior: (1) Check all relevant
menu settings. (2) Try loading the latest production software. (3) Try
initializing parameters.
"N/A" or "Not Applicable" message displayed: The control you’re
trying to use does not apply in the present context.
"Implementation in Progress" message: This feature is planned but
not yet complete.
Power-on sequence takes too long (much longer than 20 seconds):
The K4'smain processing module, also known as the single-board
computer (SBC) has its own long-life backup battery (CR2032 coin
cell). If the battery voltage is too low (under 2.9 V), power-up
sequencing may be affected. Symptoms may include multiple high-