Elecraft KXFL3 Filter Option - Manual (Page 2)

2
Setup and Operation
If you haven’t already done so:
 Follow the instructions below to install your KXFL3 module.
 Turn to page 4 to calibrate the KXFL3.
With the KXFL3 installed and enabled, the KX3 will automatically use its narrow filters, FL2 and FL3,
whenever possible. Some receive settings require the roofing filters to be bypassed, which automatically selects
FL1. These include: AM and FM modes, dual watch (DUAL RX menu entry), RX I.F. shift (RX SHFT menu
entry), and some noise blanker settings. Refer to the KX3 owner’s manual for details.
Installing the KXFL3 Module
Preparing for Installation
Preventing Electrostatic Discharge Damage
ESD damage may occur with static discharges far too little for you to notice. A damaged component may not
fail completely at first. Instead, the damage may result in below-normal performance for an extended period of
time before you experience a total failure.
We strongly recommend you take the following anti-static precautions (listed in order of importance) to ensure
there is no voltage difference between the components and any object that touches them:
 Leave the KXFL3 module in its anti-static packaging until you install it.
 Wear a conductive wrist strap with a series 1-megohm resistor that will constantly drain off any static
charge that accumulates on your body. If you do not have a wrist strap, touch a ground briefly before
touching any sensitive parts to discharge your body. Do this frequently while you are working. You can
collect a destructive static charge on your body just sitting at the work bench.
WARNING
DO NOT attach a ground directly to yourself without a current-limiting resistor as this poses a
serious shock hazard. A wrist strap must include a 1-megohm resistor to limit the current flow. If
you choose to touch an unpainted, metal ground to discharge yourself, do it only when you are
not touching live circuits with any part of your body.
 Use a grounded anti-static mat on your work bench (see below).
 If you pick up a pc board that was not placed on an anti-static mat or in an anti-static package, touch
first a ground plane connection on the board such as a connector shell or mounting point.
 If you use a soldering iron to work on a circuit board, be sure your iron has an ESD-safe grounded tip
tied to the same common ground used by your mat and wrist strap.
Choosing an Anti-Static Mat
An anti-static mat must bleed off any charge that comes in contact with it at a rate slow enough to avoid a shock
or short circuit hazard but fast enough to ensure dangerous charges cannot accumulate. Typically, a mat will
have a resistance of up to 1 Gigaohm (10
9 ohms). Testing a mat requires specialized equipment, so we
recommend that you choose an anti-static mat that comes with published resistance specifications and clean it as
recommended by the manufacturer. Testing has shown that many inexpensive mats that do not specify their