Options and Accessories
KPA500: 500 Watt+, 160-6 m amplifier with built-
in low-noise power supply and automatic drive-
level control (see CONFIG:PWR SET). Same size
and styling as the K3S.
KAT500: 500 Watt+, wide-range ATU. The K3S
can be configured to update the KAT500 as the
VFO is turned (see CONFIG:KAT3).
P3: The P3 is a fast, very sensitive panadapter with
a high-resolution display that shows signals over a 2
to 200 kHz portion of the band. It is styled to match
the K3S, and does not require a PC for operation.
K3/0-Mini: The 1.5-inch-thick “Mini” panel
duplicates all of the controls of the K3S—but
without the radio. With the Mini connected to a
computer, you can operate a remotely located K3S
(or K3) from anywhere in the world.
K144XV: All-mode, ~10 W output 2-m module.
K144RFLK option locks 2 m to main reference.
Crystal Filters: A wide variety of roofing filters
can be installed, from 200 Hz to FM bandwidths.
KAT3A: Wide-range, internal 100-W automatic
antenna tuner with dual antenna switch and true
bypass relay. ANT2 jack supplied with this option.
KPA3A: Internal 100-W upgrade for the K3S/10,
with two large fans and separate circuit breaker.
KDVR3: Digital voice recorder, usable both for
transmit messages and general audio recording.
KRX3A: High-performance, fully-independent sub
receiver with its own set of crystal filters, high-
performance KSYN3A synthesizer 32-bit DSP,
noise blanker, optional general-coverage filter array
(KBPF3, below), and diversity-RX antenna input.
KBPF3A: General-coverage band-pass filter array
that allows the K3S main and/or sub receiver to
cover the entire LF and HF range of 0.1 to 30 MHz.
KTCXO3-1: High-stability TCXO; 1 PPM
nominal, typically better than 0.5 ppm (see
calibration instructions, pg. 53).
K3EXREF: Locks the synthesizer in the K3S to an
external reference (see CONFIG:REF CAL).
PR6 and PR6-10 PREAMPS: These low-noise
preamps are not needed with the K3S, since it has a
built-in low-noise preamp (on the KXV3B module).
See Preamp 2 (pg. 25).
Firmware Upgrades
New features and improvements are available to all
K3S owners via firmware upgrades. Upgrades may
also be required when you install option modules.
Please visit the Elecraft K3/K3S software page
(www.elecraft.com/K3/k3_software.htm) to obtain
our free firmware download application, K3 Utility.
This program runs on PCs, Macs, and Linux
platforms. In addition to firmware downloading,
K3 Utility provides automated RX and TX gain
calibration, a custom power-on banner,
configuration save/restore, crystal filter setup,
CW/DATA message editing, and a terminal
function.
Some applications or peripheral devices may
interfere with K3S downloads; check the Help
information in K3 Utility if you have difficulty.
Checking your Firmware Revision
Use the CONFIG menu’s FW REVS menu entry to
determine your firmware revision. The serial
number of your transceiver, if needed, can be
obtained using the SER NUM menu entry.
K3S Firmware Self-Test
If the K3S detects an error in its firmware (an
incorrect checksum), it will flash the TX LED and
show MCU LD on the LCD (with backlight off).
If this occurs, connect the K3S to your computer
and reload firmware. While firmware is loading, the
Delta-F LED (∆ f ) will flash. When the download is
complete, the K3S should reset and run normally.
Forcing a Firmware Download
If you accidentally load an old or incompatible
firmware version and find the K3S unresponsive, do
the following: (1) unplug the K3S from the power
supply and wait 5 seconds; (2) plug the power
supply back in; (3) hold the transceiver’s POWER
switch in; after about 10 seconds, you’ll see the TX
LED flash (you’ll also see MCU LD on the LCD);
(4) load the correct firmware version.
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