Elecraft KAT1 Manual - Manual (Page 3)

3
K1 Firmware Requirements
To use the KAT1 antenna tuner, you'll need K1 main processor firmware revision 109 or later. (The main
processor is U1 on the Front Panel board.) To check the firmware revision, hold any switch when powering
up the K1. When you release the switch, the firmware revision will be shown on the LCD.
KAT1 PC Board Assembly
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A fine-point, temperature-controlled soldering iron (700-800 degrees F) is required to assemble
this kit. A high-wattage iron or one with a wide tip may damage components, pads, or traces. Use a
minimum amount of solder to avoid ground shorts.
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Install components only in the order described below. Double-check all values before soldering,
since removing parts from double-sided PC boards can be difficult.
Place relays at locations K1-K5, with the white-striped end of each relay oriented as shown by its
component outline, but do not solder. Do not bend the relay leads. Note: The reference designators for the
relays may be difficult to read on the rev. C board. They are sequential, starting from the left with K1.
Place relays at locations K6-K10. This second row of relays faces in the opposite direction from
the first row. Do not solder yet.
Using a book or other flat object to hold the relays in place on the top side of the board, flip the board
over. Solder two diagonal corner pins on each relay.
Inspect all 10 relays closely to make sure that they’re seated flat against the PC board. If not, re-heat
the corner pins one a time while pressing down on the relay. Once all relays are properly seated, solder the
remaining pins.
Install the 28-pin IC socket at U1. The notched end of the socket must be aligned with the notched
end of the component outline.
Install the following resistors, starting with R6 in the upper left-hand corner of the board:
__ R6, 1k (brown-black-red) __ R5, 100 ohms (brown-black-brown)
__ R4, 3.3k (orange-orange-red) __ R3, 200 ohms (red-black-brown)
Install the three diodes, with the banded end of each diode oriented as shown on the board. D1 and D2
are type 1N5711. D3 is a type 1N34A, with a larger glass body. Note: On the revision C PC board, D3 may
be a tight fit. Pre-form the leads if necessary.
Install potentiometers R1 and R2 as indicated by their outlines. Make sure they are fully seated on the
PC board and are not tilted. Trim the leads after soldering. This is necessary to prevent shorts when the
KAT1 is installed above the Filter board.