Elecraft T1 Assembly Manual - Manual (Page 2)

2
We strongly recommend that you use a conductive wrist strap and anti-static mat while handling the MCU
or the PC boards with the MCU installed. Wrist straps and mats are available at very low cost from Jameco,
Mouser, and other electronics suppliers.
Refer to www.elecraft.com for tool sources and solder recommendations.
Unpacking and Inventory
Preventing Electro-Static Discharge Damage
The Master Control Unit (MCU) used in the T1 automatic antenna tuner is sensitive to Electro-Static
Discharge (ESD) damage. ESD damage may not make the tuner fail completely. Sometimes the unit may
continue to operate somewhat, creating a very difficult-to-find problem. We strongly recommend that you
take the following precautions whenever handling the MCU or the PC boards when the MCU is installed.
The precautions are listed in their order of importance:
1. Leave the MCU in its anti-static packaging until you install it.
2. Wear a conductive wrist strap with a 1-megohm series resistor when handling the MCU or the
boards with the MCU installed. If you do not have a wrist strap, frequently touch an unpainted
ground while working. You can collect a destructive charge on your body just sitting at the work
bench. Do not attach a ground directly to yourself as this poses a serious shock hazard.
3. Use an ESD-safe soldering iron with a grounded tip.
4. Use a grounded anti-static mat on your work bench.
Identifying Capacitors
Capacitors are identified by their value and the spacing of their leads.
Small-value fixed capacitors are usually marked with one, two, or three digits and no decimal point. If one
or two digits are used, that is the value in picofarads (pF). If there are three digits, the third digit is a
multiplier. For example, a capacitor marked "151" would be 150 pF (15 with a multiplier of 10
1 ). Similarly,
"330" would be 33 pF, and "102" would be 1000 pF (or .001 µF). Exceptions are described specifically in
the text and parts list.
Fixed capacitors with values of 1000 pF or higher often use a decimal point in the value, such as .001, .047,
or 2.2. This is the value in microfarads (µF) (1 µF is equal to 1,000,000 pF).
Most of the capacitors in this kit have a lead spacing of 0.2”. When a capacitor with a lead spacing of 0.1”
is called for, it is stated in the description, e.g. Capacitor C20, .01 µF, LS 0.1” (103).
Identifying Resistors
Resistors are identified by their power dissipation rating and their resistance value. The power rating is
indicated by their physical size. There are both 1/4 watt and 1/8 watt resistors in your T1 tuner kit. The 1/8
watt resistors are about one-half the size of the 1/4 watt resistors.