External Speaker - ELECRAFT K 2 Owner's Manual

K2 Manual 1/24/99 V.XC ©1999 Elecraft
Alternative Energy Sources: Operation directly from a solar panel
or other alternative energy source is possible, but the source must be
well regulated and filtered. The alternative energy source could also
be used to charge a battery, which in turn is used to power the
transceiver. A small (300mA) solar panel can keep the K2's internal
battery recharged indefinitely for casual operation, completely
eliminating reliance on AC power. Note that the voltage regulator
must be designed to turn its output off completely if the input voltage
drops too low to maintain 13.8-14.0V at the output.
Antenna
A well-matched 50 ohm antenna or an antenna tuner should be used
with the K2. If the antenna is not close to 50 ohms, power output
readings shown on the K2 display will be inaccurate. Some high SWR
conditions may result in excessive current drain.
If for any reason you're not sure how well your antenna is matched,
do not operate at higher than 5W output. You can use the K2's
voltage/current display to check voltage and current on transmit.
Keying Devices
Any type of hand key, bug, or external keyer can be plugged into the
KEY jack, or you can use the K2's built-in memory keyer. In all
cases, you must use a stereo plug with the keying device (a suitable
plug is provided with the kit). Please refer to the CW Operation
section for details on selecting a keying device and using the internal
keyer.
Microphone
A standard 8-pin microphone jack is provided on the front panel. This
jack is not pre-wired. Instead, there is a dual 8-pin jumper block on
the bottom of the front panel PC board that can be used to configure
the mic jack for nearly any compatible microphone. (The jumper
block and other mic interface components are supplied with the SSB
adapter.) Selected control functions are supported for some
microphones, including UP, DOWN, and FUNCTION.
(Additional details will be provided in the next manual revision.)
Headphones
Any type of mono or stereo headphones at nearly any impedance will
work with the K2. However, for best results we recommend high-quality,
8 to 32 ohm stereo headphones.
While it is possible to use a 1/4" to 1/8" adapter to handle phones with a
1/4" plug, the adapter tends to get in the way. You may wish to stick with
headphones that have a standard 1/8" plug, which includes virtually all
portable-stereo headphones. A right-angle plug is particularly well suited
to this application since the bulk of the plug and cable will be kept out of
the way, below the panel.

External Speaker

The K2 has a built-in, high-sensitivity 4 ohm speaker. You can also plug
in an external 4 or 8 ohm speaker at the "EXT. SPKR" jack on the upper
rear panel. (Elecraft plans to offer a an external speaker kit at a later
date.)
Option Connectors
A number of mounting holes are provided on the back panel of the K2 for
specific option connectors. For details, refer to the Internal Options
section of the manual.
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