Introduction

The Elecraft K3S sets the standard for compact, high-performance transceivers, proving to be ideal for DXpeditions, multi-transmitter contesting, Field Day, and home stations alike. The K3S delivers the best of both worlds: a hybrid of software-defined radio (SDR) technology and our proven, high dynamic range superhet receive architecture.

The optional KRX3 high-performance, fully independent sub receiver offers true diversity operation to reduce fading. 32-bit DSP provides stereo effects, Noise Reduction, TX and RX Equalizers, Notch, and built-in PSK31, CW, and RTTY decode/encode."

Configure or Not to Configure Your K3S?

You have the option to choose one of three K3S packages that fits most amateur radio operator's needs, but if you chose to configure your own K3S, please take a moment to read ELECRAFT K3S Application Note: "Configuring your K3S and K-Line System" , "K3S Crystal 'Roofing' Filters" document from Wayne and Eric, and the Crystal Filter Response Plots.

Important ordering instructions if you are configuring your K3S

1. If you are ordering a Kit, order items from Options and Filter sections that specify Kit.
2. If you are ordering a Factory Assembled K3S, order items from Options and Filter sections that specify Factory Assembled.
3. Ordering Crystal Filters -There are 5 filter positions per K3S and 5 positions per KRX3A. The 2.7 filter comes with the K3S and the KRX3A. You may exchange the 2.7 filter for the 2.8_2.7 filter for the K3S and/or the KRX3A. Select the KFL3A-2.8/2.7 SWAP to receive the discounted price.
4. You may select up to 4 additional filters for the K3S and/or the KRX3A.

Overview

Overview

Elecraft’s state-of-the-art K3S transceiver offers a unique combination of ultra-high performance and affordability.

Both 100-watt and 10-watt (upgradeable) models are available as a no-soldering kit. Available fully assembled and tested, the K3S is comparable in both features and performance to transceivers listing at up to six times its price.

In a first for the industry, the K3S’s identical main receiver and subreceiver each feature a high-dynamic-range, down-conversion analog architecture. This allows Elecraft to provide roofing filters with bandwidths as narrow as 200 Hz, while up-conversion designs have roofing filters typically 3,000 to 15,000 Hz in width. Unlike some competing down-conversion designs, the K3S also provides 6-meter coverage, as well as continuous tuning from 0.5 to 30 MHz. Each receiver has its own bus-switching mixer, narrow ham-band front-end filters, 32-bit I.F. DSP, low-noise synthesizer, and up to five crystal roofing filters.

The K3S is the only deluxe transceiver that is targeted at both home and field use.

It’s well-suited to demanding DXpedition or Field Day operations. Its receive-mode current drain of less than 1 amp greatly facilitates battery or solar-powered mobile/RV/marine installations. But unlike smaller portable transceivers, the K3S’s user interface is optimized for ease of use, and its feature set rivals units many times its size and weight.

The transceiver is offered both factory-assembled and as a modular, no-soldering kit. Either way, K3S owners can start with a basic version of the transceiver, at lower cost, then easily add modules later, such as the internal subreceiver, ATU, and 100-W stage. To ensure identical performance of both pre-built units and modular kits, modules are 100% assembled and tested at the factory. Builders learn the radio theory behind each of the modules during assembly, and acquire skills that will enable them to easily add future modules or upgrades.

Two 32-bit digital signal processors provide true software-defined features, along with expansion memory to handle future signal processing tasks and operating modes. The operator will have full control over any operating situation, with 8-band receive and transmit EQ, stereo speaker/soundcard outputs, binaural effects, and advanced noise reduction. Also included is built-in PSK31, CW, and TTY decode/encode, so the operator can enjoy the excitement of data communications with or without a computer. The rig’s rich I/O complement includes an isolated sound card interface, front/rear mic/phone jacks, dedicated serial I/O, and band data. The K3S also provides transverter in/out and RX antenna in/out jacks. The latter allow the use of RX-only, in-line filters for extreme operating environments.

*Requires KBPF3A module. Receive coverage extends down to 100 kHz. 0.5-mW transmit output at 472 kHz (630 m band) for use with external amplifier.

Configure or Not to Configure Your K3S?

You have the option to choose one of three K3S packages that fits most amateur radio operator's needs, but if you chose to configure your own K3S, please take a moment to read ELECRAFT K3S Application Note: "Configuring your K3SS and K-Line System" , "K3S Crystal 'Roofing' Filters" document from Wayne and Eric, and the Crystal Filter Response Plots.

K3S Packages

K3S Packages

We've taken the most popular K3S configurations and created three packages that fits most anyone's operating style! Each package comes factory assembled. If your operating style changes, you can add additional options anytime.

K3S Casual User	K3S DX'er	K3S Contester & DX'er
K3S/100-F 160-6M 100W Transceiver	K3S/100-F 160-6M 100W Transceiver	K3S/100-F 160-6M 100W Transceiver
100W Internal Autotuner	100W Internal Autotuner	Digital Voice Recorder
2.7 kHz Filter	2.8 kHz High Perf. filter Upgrade	100W Internal Autotuner
MH4 Hand Mic	2.1 kHz High Perf. SSB/Data Filter	2.8 kHz High Perf. SSB/Data Filter
The Elecraft K3S & P3 by Fred Cady	400 Hz High Perf. CW/Data Filter	2.1 kHz High Perf. SSB/Data Filter
Elecraft Hat	High Perf. Subreceiver	400 Hz High Perf. CW/Data Filter
Over $200 Savings!	2.8 kHz High Perf. SSB/Data Filter (for Sub-receiver)	200 Hz High Perf. CW/Data Filter
	400 Hz High Perf. CW/Data Filter (for Sub-receiver)	High Perf. Subreceiver
	P3 Panadapter	2.8 kHz High Perf. SSB/Data Filter (for Subreceiver)
	MH4 Hand Mic	400 Hz High Perf. CW/Data Filter (for Subreceiver)
	Elecraft Hat	P3 Panadapter
	Over $250 Savings!	P3SVGA Video Adapter
		MH4 Hand Mic
		Elecraft Hat
		Over $300 Savings!

*K3S Package options cannot be substituted for other options or accessories.

Popular Additions for your K3S Package

K3S Casual User	K3S DX'er	K3S Contester & DX'er
500 Hz CW/Data Filter	200 Hz CW/Data Filter	K-POD Ext. Tuning Knob
SP3 Ext. Speaker	SP3 Ext. Speaker	SP3 Ext. Speaker
P3 Panadapter	Video Adapter
Video Adapter	Digital Voice Recorder

Add Our Power Combo PLUS (KPA500-F & KAT500-F) to Any K3S Package and Get Even More Savings!

Power Combo PLUS Package includes: KPA500-F Amplifier, KAT500-F High performance Auto tuner, all necessary cables to connect with your K3S,
and the KPA500 & KAT500 book by Fred Cady.

$100 Savings!

Power Combo PLUS discount for K3S Packages only.

Specs

Specs

STANDARD FEATURES

160-2 meter all-mode coverage (2 meters with K144XV option)
Superhet/SDR architecture with narrow ham-band filtering
High-contrast, full-custom LCD with alphanumeric text display
100-W or 10-W (upgradeable) models
32-bit I.F. DSP (dual DSPs with sub receiver installed)
Built-in PSK/RTTY decode/display; send data using CW keyer paddle
High performance, low-noise synthesizer with 1-Hz tuning
All radio firmware may be updated with the K3 Utility software

RECEIVER

Optional sub receiver with performance identical to main receiver
2nd preamp for 12-6 m weak-signal work; 3 attenuator levels (5/10/15 dB)
RX ANT in/out jacks included
Optional general-coverage band-pass filters (KBPF3A); allows receive coverage down to 100 kHz, 0.5-mW transmit on 630-m band (472 kHz)
Optional crystal roofing filters as narrow as 200 Hz; DSP filters to 50 Hz
CW audio peaking filter (APF)
Synchronous AM receive or envelope detection
Easy-to-use Shift/Width/HiCut/LoCut w/ DSP passband display
Automatic and manual notch filtering; adjustable noise reduction
8-band graphic equalizer with separate CW/voice settings
Hardware and DSP noise blankers with individual level controls
Center tuning indicator for CW and data modes

TRANSMITTER

Adjustable output, 0.1 to 100 W+ (K3S/100) or up to 10 W+ (K3S/10)
Rugged, SWR-protected finals; dedicated PA circuit breaker
DSP I.F. speech processor with noise gate for maximum DX punch
Dual 4-speed fans in K3S/100
Fast, silent, PIN-diode T-R switching – no relays
8-band equalizer tailors mic audio to your voice and microphone

Additional Features

Includes both USB and RS232 ports; Using USB port eliminates need for PC sound card and line-level audio cables (line in/out jacks still included)
K144XV option adds 144-148 MHz, 10W, all-mode operation
Transverter in/out jacks included; 9 transverter band displays
Internal CW keyer with message buffers; voice messages with KDVR3
User ‘macros’ automate often used sequences, such as custom SPLITs
100 general-purpose VFO memories and 4 “quick memories” per band (plus a free memory editor utility for use on your computer)

Options/Accessories

Options

Accessories

Reviews

Reviews

QST K3S Review Quote: "..the results are impressive. Overall receiver performance is right up there with the best radios the Lab has ever measured, and this is the first receiver we've tested with better than 100 dB IMD dynamic range at the closer signal spacing."

FAQ

FAQ

Q: What are the new features of the Elecraft K3S?

A: The K3S is Elecraft's second-generation, software-defined superhet transceiver (SDR). We've upgraded nearly every subsystem, improving performance and adding many new features. Here's a quick overview:

New Features	Available now?
Ultra-Low-noise synthesizer	Unequaled strong-signal receive performance; exceptional transmit signal purity.
Second preamp (Preamp 2)	Built-in equivalent of Elecraft's PR6-10 low-noise amplifier (LNA) for weak-siginal work on 12,10, and 6m. Preamp 2 is part of the KXV3B module (now included as a standard feature). The KXV3B also provides RX antenna in/out jacks, transverter in/out jacks, and a buffered IF output for use with our P3 panadapter.
Multiple attenuation levels	Attenuation levels of 0,5,10, and 15dB; selectable per-band.
Dual computer ports (USB and RS232)	In addition to the legacy RS232 port, the new USB port integrates computer remote control and line-level audio.This eliminates the need for a sound card or external converters and their associated cables. Supports Windows, Linux and Apple platforms.
KAT3A option now includes bypass relay	Lower loss on bands where matched antennas are used.
Redesigned speaker amplifier	Stereo speaker outputs now have lower total harmonic distortion (THD) for reduced listening fatigue.
Fast transmit/receive switching	High-accuracy CW transmit timing--even at high code speeds wtih SPLIT, RIT, and XIT in use.
Extended coverage includes 630 and 2200 meter bands	When used with the KBPF3A option, receiver covers 630 m (472 kHz), and 2200 m (137 kHz), tuning as low as 100 kHz. Transmit output of 0.5-1.0 mW on 630 m (for use with an external amplifier).
Enhanced look and feel	New LCD bezel; soft-tough VFO A know with improved grip.

Q: What components have benn changed for the K3S? Are they available for the K3?

A: Nearly all internal modules have been upgraded for the K3S. Some of the modules that are compatible with the K3 are already available:

K3S Module	New Features	Available now?
KSYN3A	Very low close-in phase noise Faster T/R switching VFO tuning down to 100kHz (with KBPF3A)	Yes Kits available for order now Please order KSYN3AUG
KXV3B	Built-in low noise preamp for 12/10/6 m	Yes Kits available for order now.
KAT3A	Includes true bypass relay for lower loss with well-matched antennas	Yes Kits available for order now.
KRX3A	Sub receiver now includes KSYN3A synthesizer	Yes Kits available for order now.
KBPF3A	Redesigned filter extends Very Low Frequency (VLF) operation down to 100 kHz.	Yes Kits available for order now.
KIO3B	Adds direct USB connection Eliminates need for PC soundcard and cables RS232 connection remains supported; adapter cable included with K3S	Yes Kits available for order now. Please order KIO3BUP
Soft-touch VFO A grip	Updated design with new grip pattern Softer material for improved tuning feel	Yes Please order NEOGRIP

Q: Will any other K3S modules or components be made available for K3 use?

A: Yes. The following additional K3S modules and components are compatible with the K3, and will be offered once excess inventory is available for upgrade purposes:

K3S Module	New Features	Available now?
Main DSP board	Enhanced speaker amplifier with low-distortion pre-driver	Yes

Q: What modules are unique to the K3S?

A: These upgraded modules (and components) are unique to the K3S and will not be available for K3 upgrades:

K3S Module	What has changed	Unique to the K3S?
K3S RF Board	Added 5/10/15dB Attenuator Lower RF and digital noise floor Better port-to-port isolation	Yes
K3S Front Panel Board	Real-time clock frequency adjustable; calibrated at factory to better than +/-0.5 sec./day	Yes
Front Panel Sheet Metal	Updated silkscreen	Yes
K3S LCD/VFO Bezel	New single-piece molded bezel with logo and integrated VFO pointer	Yes

Q: Will my existing crystal filters work with the K3S?

A: Yes, all K3 crystal filters are fully compatible with the K3S. They are configured in the same way.

Q: Can I move the KPA3 100-watt PA module from my K3 to a K3S, or do I need the new KPA3A module?

A: A KPA3 can be used in a K3S. However, we recommend using the KPA3A PA module, because the K3S RF board was optimized for use with the KPA3A's MOSFET power transistors. In a K3S, a KPA3A will typically provide 1 to 3 dB better transmit IMD performance, on average, than a KPA3.

Q: With the K3S, will I need to keep track of another set of firmware revisions?

A: No. New firmware releases will determine automatically whether you are using a K3S or a K3, and will support both original and upgraded modules. There will be no change in the numbering of these combined K3S/K3 firmware releases. You will be able to use K3 Utility to manage firmware updates for both transceivers.

Q: Will K3S serial number sequencing change?

A: Yes. K3S serial numbers will begin at 10000.

Q: What has changed on the rear panel of the K3S?

A: The most important change is to the communication ports in the upper right corner of the rear panel. This is where the new USB connector is located. The original RS232 port functions are preserved, though with a different jack type (RJ45) and a supplied DE9 adapter cable. The accessory jack (ACC) is unchanged. The included adapter cable (shipped with the K3S) duplicates the original 9-pin RS232 port, so you can continue to use all of your station accessories as before. The illustration below shows the rear panel of the K3S. The fan panel shown is supplied with100-W model.

Q: Can the KPA500 and KAT500 be used unchanged with the K3S?

A: Yes. The K3S supports these K-Line products. All cabling will remain the same as you see in the KAT500 and KPA500 Owner’s Manuals.

Q: Will the P3 operate with the K3S in the same way??

A: Yes. The K3S will support the P3 using the same cables you are using now for your P3 connections, with the addition of a supplied RJ45- to-DE9 adapter

Q: How can I operate the P3 and use the new USB port at the same time?

A: To use both USB connectivity and the P3, you’ll need a new cable, CBLP3Y. The CBLP3Y cable will enable direct USB connection while accommodating full P3 support.The CBLP3Y cable will be available directly from Elecraft. Price and availability will be announced prior to K3S shipments

Q: What will happen to the K3 now that the K3S is available?

A: With the introduction of the K3S, the K3 is no longer available. Elecraft production has already switched to the K3S.

Q: Now that there’s the K3S, what should I expect for support of the K3?

A: Elecraft will continue to honor all warranties and will continue to fully support the K3. There is no change to this policy in any way. Anyone who has purchased a K3 will continue to receive email support and firmware updates when they are made available..

Q: How long should I expect to get parts and email support for the K3?

A: Currently, there are no changes planned for parts andsupport for the K3
for the foreseeable future.

Q: Will Elecraft still provide phone call and email support for the K3?

A: Yes. there are no changes planned for parts and support for the K3 for the foreseeable future.

Q: Will the K3/0 Mini and Remote system work with the K3S?

A: Yes. all cabling and Remote System productswill work with the K3S.

Manuals

Manuals