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Introduction to the Elecraft K4
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Rev.!C2,!June!8,!2021!
Copyright!2021,!Elecraft,!Inc.!
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This!fully!illustrated!manual!is!intended!as!an!introduction!to!the!K4,!
providing!the!essential!information!you’ll!need!to!get!on!the!air.!!
!
Refer!to!the!K4#Operating#Manual!!for!additional!details!on!all!topics.!This!
manual!can!be!viewed!directly!from!the!K4!itself,!as!explained!on!page!10.!
You!can!also!view!it!using!any!web!browser.!To!be!sure!you’re!using!the!
latest!version,!use!this!link,!then!click!on!K4!Manuals:!
!
!!!!!!!!!!https://elecraft.com/pages/manuals-downloads!
!
!
The!Elecraft!K4!is!a!high-performance,!direct-sampling!software-defined!
radio!(SDR).!It!covers!the!160!~!6!m!bands,!with!continu ous!receive!from!
100!kHz!~!54!MHz.!10!W!and!100!W!models!are!available.!It!can!be!used!
with!internal!or!external!transverters!to!cover!bands!above!6!meters.!!
!
Among!the!K4's!notable!features:!!Large!color!touch!screen,!as!well!as!
support!for!an!external!high-resolution!monitor;!extensive,!easy!to!use!
controls;!rich!analog!and!digital!connectivity;!dual!receive!(all!models);!
built-in!data!modes,!and!wide-range!automatic!antenna!tuner.!The!K4's!
compact!size!and!weight,!combined!with!11-15!VDC!operation!and!low!
current!drain,!make!it!suitable!for!field,!travel,!or!home!station!use.!
!
Since!the!K4!is!an!SDR,!Elecraft!can!provide!updates!to!its!signal!processing!
algorithms!with!software!changes!rather!than!by!adding!new!hardware.!
This!ensures!that!the!K4!can!take!advantage!of!new!modes,!bands,!or!
other!features!in!the!future.!Since!it!uses!direct!sampling,!signals!are!
digitized!right!at!the!receiver!inputs,!and!the!transmitter's!amplifier!chain!
is!also!driven!by!a!digitized!signal.!Older!SDR!architectures!digitized!signals!
at!a!low!intermediate!frequency!(IF),!resulting!in!poor!suppressions!of!
down-conversion!or!up-conversion!images.!
!
There!are!three!models:!the!basic!K4,!with!one!set!of!receive!filters!and!
one!analog-to-digital!converter!(ADC);!the!K4D,!which!adds!a!second!set!of!
receive!filters!and!a!second!ADC;!and!the!K4HD,!which!ad d s!a!
superheterodyne!front!end!that!can!be!enabled!when!needed!to!provide!
even!greater!dynamic!range.!The!superhet!module!uses!high-performance,!
narrow-band!crystal!filters.!All!K4!models!provide!simultaneous!dual!
receive!on!the!same!or!different!bands/modes,!though !the !additional!
receiver!module!in!the!K4D!and!K4HD!(KRX4)!improves!signal!handling!
during!dual-receive!operation!on!different!bands.!The!second!receiver!also !
permits!diversity!reception,!i.e.,!the!use!of!different!antennas!for!the!two!
receivers!to!counteract!fading!(QSB).!
!
A!basic!K4!can!be!upgraded!to!a!K4D!by!installing!the!KRX4!option.!
Similarly,!a!K4D!can!be!upgraded!to!a!K4HD!by!installing!a!KHDR4!module.!
Other!internal!options!and!external!accessories!work!with!all!models,!
including!a!wide-range!ATU!(KAT4),!MH4!microphon e,!SP 4!ex ternal!
speaker!(1!or!2).!!
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4!
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)#5".'*J!!=KLMNO!PLMK!G2!QKLQRKSP!TRULKR!LQRKVWXLN0!(LK!YMZZRYWXLNY[!
YRR!\\\0VKKS0LKZ7ZKLMNOXNZ0!!
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&+9!VNO!%XZ]WNXNZ!3KLWR^WXLNJ!!Even!though!the!the!K4!has!extensive!
internal!protective!circuitry,!external!protection!against!lightning!strikes!is!
strongly!recommended,!especially!in!lightning-prone!areas.!During!storms!
and!when!the!station!is!not!in!use!for!an!extended!period,!disconnect!ALL!
equipment!from!the!radio,!including!antennas,!the!power!supply,!routers!
or!hubs,!and!computers.!Ethernet,!USB,!and!RS232!cables!are!a!frequent!
source!of!damaging!surge!voltages.!
!
'KXRNWVWXLN!VNO!#XK!(SL\J!!Provide!at!least!1"!of!free!space!above!and!
behind!the!K4.!Ventilation!holes!on!the!bottom!and!left!sides!must!also!not!
be!blocked.!
!
5YXNZ!W]R!"XSW!+WVNOJ!!If!the!K4!is!placed!on!a!desk!or!table,!deployment!of!
the!tilt!stand!is!recommended!to!facilitate!interaction!with!the!touch!
screen.!This!will!also!improve!the!display!viewing!angle.!
!
!
.NWRKUV^XNZ!WL!+WVWXLN!&_MXQ`RNWJ!!The!illustration!on!the!next!page!shows!
the!locations!of!all!rear-panel!connectors.!At!minimum!you'll!need!to!
connect!a!power!supply,!antenna,!and!station!ground.!(See!power!supply!
and!antenna!recommendations!below.)!An!Ethernet!connection!is!required!
for!software!upgrades!(see!pg.!11).!The!K4#Owner’s#Manual!provides!full!
instructions!for!interfacing!to!computers,!amplifiers,!and!other!equipm en t.!!
!
3L\RK!+MQQSPJ!!A!power!supply!voltage!of!13.8!to!14.2!V!is!preferred.!
Minimum!supply!voltage!is!11.0!V,!while!current!required!is!either!6!A!max!
(K4/10)!or!25!A!max!(K4/100).!The!K4!will!automatically!reduce!power!
output!if!the!supply!voltage!is!inadequate!to!maintain!good!IMD!
performance.!Use!the!shortest!practical!length!of!power!cable,!with!heavy!
wire!gauge!to!minimize!voltage!drop.!The!supplied!power!cable!includes!
fuses!in!both!legs.!
!
#NWRNNVYJ!!If!your!K4!includes!the!KAT4!ATU!option,!you!can!match!a!wide!
variety!of!loads!to!the!transceiver!by!tapping!the!ATU!TUNE!switch.!If!not,!
you’ll!need!to!use!matched!antennas!(nominally!50!ohms)!or!an!external!
antenna!matching!device.!
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!
5!
-&#-!3#*&%!)'**&)"'-+!
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#*"?7A71!! HF-6M!(used!with!KAT4!ATU)! ! ! &"F&-*&"! Connect!to!router!or!modem! ! 3F'*&+! Rear!headphones!(in!addition!to!front)!
#*"2!! ! Supplied!with!internal!XVTR!option! ! 5+$!#!HaAI! Type!A!(keyboard,!mouse,!K-Pod)! ! >.)! ! Rear!mic,!3.5!mm!
?A!,9)!.N!!!!! 11-16!V;!6!A!(10W)!/!25!A!(100!W)!! ! 5+$!$!H3)I! Type!B!(for!ctrl/dig.!AF/PTT/KEY/FSK)! -+A1A!! See!RS232!
?A!,9)!'MW!! Switched!accessory!supply!! ! ! ,.9&'!! External!monitor! ! ! ! 3""!.*!! Push-to-talk!line!(foot!switch,!etc.)!
"D!+>3%!.N! For!use!with!compatible!amplifiers! ! -&(!.*!! 10!MHz!external!reference!input! ! G&:!'5"! For!keying!external!amps,!etc.!
D,"-!.(! XVTR!I/O;!XVTR!IF!IN!doubles!as!RX!ANT!2! %.*&!.*7'5"!600!ohms!(nominal),!analog!audio!! 3#99%&7G&:!For!CW!paddle!/!hand!key!or!keyer!
-D!#*"! RX!ANT!IN!1,!and!RX!ANT!OUT!(for!filter)!! +3G-+!! 1!or!2!ext.!speakers!(e.g.,!SP4)! ! #))! ! Accessory!signals!(see!ACC)! !
VIDEO!
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6!
)'**&)"'-!3.*'5"+!
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>.)!(Front!Panel)!
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An!Elecraft!MH4!or!other!K4/K3S/K3-compatible!mic!can!be!used!with!the!front!panel!
mic!jack!(see!pinout!below).!!
!
To!select!the!front-!or!rear-panel!mic,!turn!bias!or!preamp!on/off,!or!enable/disable!mic!
buttons,!tap!"D!on!the!LCD,!then!use!>.)!+&%!and!>.)!)(=!(also!see!MICROPHONE!
CONFIGURATION).!Bias!must!be!turned!LN!for!electret!mics!(e.g.!MH4,!MH2,!MD2,!
Proset).!It!must!be!LUU!for!dynamic!mics!(e.g.!Heil!mics!using!HC4!or!HC5!elements).!!
!
!!!!!!!!!!!!! !
!
3XN!b! 9RY^KXQWXLN!
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1!!!! Mic!audio,!low-Z!(~600!ohms)!
2!!!! PTT!*!
3!!!! DOWN!button!c!
4!!! UP!button!c!
5!!! FUNCTION!button!c!
6! 8V!(10!mA!max)!
7,!8! Ground!
!
c!Use!"D!>!>.)!)(=!enable!or!disable!mic!buttons.!
!
-+A1A!!(DE9)!
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This!jack!provides!a!true!RS232-level!interface!for!use!with!PC!serial!ports.!!
!
!!!!!!!!!!!!!!!!!! !!!
!
3XN!b! 9RY^KXQWXLN!
!
1! Not!used!
2! RXD!IN!(data!WL!PC!UKL`!K4)*!
3! TXD!OUT!(data!WL!K4!UKL`!PC)*!
4! DTR!(see!PTT,!KEYING,!and!FSK,!below)!
5! Ground!
6! Not!used!
7! RTS!(see!PTT!KEYING,!and!FSK,!below)!
8! Not!used!
9! Not!used!
!
*!These!signals!are!labeled!UKL`!W]R!QRKYQR^WXdR!LU!W]R!3).!per!industry!convention.!
!
!
3""[!G&:.*=!VNO!(+G!
!
The!RS232!port’s!RTS!and!DTR!signals!can!be!used!to!emulate!the!PTT!IN!and!KEY!
inputs.!The!DTR!signal!can!also!be!used!as!an!FSK!input.!Refer!to!the!Serial!I/O!menu!
entry!entries.!
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!
7!
#))!(DE15)!
!
!!
"]R!#))!eV^f!XY!NLW!V!,=#!dXORL!^LNNR^WLK!!!
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The!ACC!interface!provides!signals!that!are!most!often!used!to!control!an!Elecraft!KPAseries!linear!amplifier!and/or!KAT500!ATU!via!a!15-wire!control!cable.!It!can!also!be!
used!with!band!decoders,!transverters,!or!other!devices.!See!table!at!right.!
!
!!!!!!!!!!!!! !
!
$VNO!'MWQMWY!
!
The!ACC!jack’s!BAND0-BAND3!lines!are!open-drain!with!internal!pull-up!resistors!to!5!V.!
Band!data!is!based!on!the!frequency!of!the!transmit!VFO!(VFO!A!in!non-split,!VFO!B!in!
split).!The!table!below!applies!to!HF;!for!historical!reasons,!60!m!uses!0000.!On!external!
transverter!bands,!the!transverter!band!number!is!used!(1!-!12,!or!0000!-!1100).!!
!
$VNO!
$#*91!
$#*9A!
$#*9?!
$#*9@!
160!m!
0!0!0!1!80!m!0!0!1!0!
60!m!0!0!0!0!
40!m!0!0!1!1!
30!m!0!1!0!0!
20!m!0!1!0!1!
17!m!0!1!1!0!
15!m!0!1!1!1!
12!m!1!0!0!0!
10!m!1!0!0!1!
6!m!1!0!1!0!
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3XN!
+XZNVS!*V`R!
9RY^KXQWXLN!
1!
FSK!IN!
Direct!keying!input!for!use!with!FSK!data!mode.!TTLcompatible;!pulled!up!to!5!V.!!(For!FSK!keying!at!RS-232!voltage!
levels,!use!the!DTR!pin!on!the!RS-232!connector.)!
2!
AUXBUS!
See!Elecraft!KRC2!Controller!and!XV-Series!Transverter!
instruction!manuals.!5!V,!bidirectional.!
3!
BAND1!OUT!
Open-drain!band!selection!outputs!with!internal!pullup!
resistors!to!5!V.!See!Band!Outputs!table!at!left.!Used!with!
KPA500!and!KPA1500!amplifiers!and!KAT500!ATU.!
4!
PTT!IN!
Functionally!equivalent!to!MIC!PTT!button.!TTL!input!pulled!up!
to!5!V.!
5!
Ground!
Ground!
6!
DIGOUT0!
Open-drain!output!asserted!when!an!external!transverter!is!!
in!use!(0V);!otherwise!hi-Z.!!
7!
TX!INHIBIT!
5!V!logic!input.!Configure!for!active-low!or!active-high!transmit!
inhibit!using!TX!Inhibit!menu!entry.!!
8!
POWER!ON!
Input!(high-Z);!pull!to!ground!using!an!external!switch,!relay!!
or!logic!gate!to!turn!the!K4!on.!!
9!
BAND2!OUT!
Open-drain!band!selection!outputs!with!internal!pullup!
resistors!to!5!V.!See!Band!Outputs!table!at!left.!
10!
KEYOUT-LP!
Open-collector!keying!output!functionally!equivalent!to!the!!
KEY!OUT!jack.!10!mA!max.!!
11!
DIGOUT1!
Per-band/per-antenna!output!for!controlling!external!gear.!!
0!VDC!when!asserted,!otherwise!hi-Z.!
12!
Ground!
Ground!
13!
BAND0!OUT!
Open-drain!band!selection!outputs!with!internal!pullup!
resistors!to!5!V.!See!Band!Outputs!table!at!left.!
14!
BAND3!OUT!
Open-drain!band!selection!outputs!with!internal!pullup!
resistors!to!5!V.!See!Band!Outputs!table!at!left.!
15!
EXT!ALC!
See!EXTERNAL!ALC.!Input,!-10!V!to!0!V!DC.!
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8!
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3'/&-!'*7'((!
!
*LWRJ!!In!this!document,!“switch”!refers!to!a!physical!switch,!while!“button”!refers!to!a!labeled!touch!control!on!the!LCD.!Yellow!arrows!are!used!to!indicate!
controls!being!described,!such!as!POWER!switch,!below.!!
!
• Tap!the!POWER!switch!to!turn!the!K4!on.!The!logo!screen!will!appear!while!module!self-tests!are!performed.!
• Always!use!the!POWER!switch!to!turn!the!K4!off.!Before!turning!off!the!power!supply,!wait!until!all!of !the!K4’s!LEDs!have!turned!off!(about!4!seconds).!
! !
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!
9!
9.+3%#:!
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• The!K4!has!a!full!color,!7”!LCD!screen.!Capacitive!touch!capability!allows!convenient,!intuitive!access!to!on-screen!controls.!A!mouse!can!also!be!used.!
• Each!VFO!has!a!large!numeric!display,!mode!indicator,!S-meter,!filter!passband!graphic,!and!full!set!of!receive!icons.!!
• The!main!RX!is!always!associated!with!the!frequency!of!VFO!A.!When!the!sub!RX!is!turned!on,!it!is!always!associated!with!VFO!B,!except!in!diversity!mode.!!
• The!RIT/XIT!offset!box!(in!white)!and!transmit!icons!(in!orange)!are!located!between!the!two!VFOs.!!
• Transmit!icons!include!SPLIT!on/off,!VOX,!transmit!antenna!name/number!(in!this!case,!“2:YAGI”),!ATU!in-line,!and!QSK.!
• The!remainder!of!the!display!is!used!for!the!panadapter,!multifunction!control!buttons!(at!left),!and!7!primary!function!buttons!(lower!edge).!
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$5.%"<.*!'3&-#".*=!># * 5 #%!
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• Tap!the!“?”!button!on!the!K4!front!panel!(identified!by!a!yellow!arrow,!below)!to!bring!up!the!built-in!operating!manual.!!
• To!see!information!on!the!controls!most!recently!used,!tap!the!LAST!CTRL!button!one!or!more!times.!!
• Use!the!VFO!A!knob!to!scroll!through!text.!Navigate!using!underlined!links!and!the!forward/back!arrow!buttons.!!
• Tap!the!table!of!contents!or!magnifying!glass!buttons!to!search!by!topic.!!
• A!button!is!provided!to!select!either!the!small!manual!format!(shown!here)!or!a!larger!format—using!the!entire!screen—to!reduce!the!need!for!scrolling.!
!
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11!
+'("/#-&!539#"&!
!
K4!software!can!be!updated!right!from!the!front!panel.!An!Ethernet!connection!is!usually!required,!though!you!can!also!update!from!a!pre-configured!flash!
drive!plugged!into!any!of!the!K4’s!USB!jacks.!To!do!an!update:!
!
• Tap!the!Fn!button!(see!previous!page),!then!hold!UPDATE.!This!will!bring!up!the!software!update!screen!shown!below.!
• Select!a!release!type!from!the!pulldown!menu.!The!default!is!Production!Release.!!
• Tap!Check!for!Updates.!This!will!download!(but!not!install)!any!updated!software!components,!displaying!them!in!the!large!text!box.!
• Optionally!tap!Release!Notes!to!preview!what!has!changed.!If!you’re!ready!to!proceed,!tap!Install.!Tap!Exit!after!the!update!completes.!
! !
!
!
12!
,('!#!)'*"-'%+!
!
The!VFO!A!knob!controls!the!frequency!of!the!main!receiver.!It!is!also!used!to!adjust!parameters,!scroll!through!menu!entries,!etc.!Switches!near!the!VFO!A!
knob!control!related!functions:!
!
• Tap!FREQ!ENT!to!directly!enter!an!operating!frequency.!Hold!SCAN!to!scan!between!VFO!A!and!VFO!B!of!the!last-recalled!frequency!memory.!
• Tap!RATE!to!select!1!or!10!Hz!tuning.!Hold!KHZ!to!select!a!per-mode!coarse!tuning!rate.!
• Tap!SUB!to!turn!on!the!sub!receiver.!Hold!this!switch!to!enter!DIVERSITY!mode.!LEDs!above!the!VFO!A!knob!show!the!status!of!these!settings.!
• To!lock!the!VFO!A!knob,!tap!the!LOCK!A!switch.!A!hold!of!this!switch!locks!VFO!B.!!
!
!! !
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!
13!
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$#*9!+&%&)".'*!
!
• Tap!the!BAND!button!to!change!bands!(see!arrow).!BAND!is!one!of!the!seven!primary!function!buttons.!
• A!band!button!can!be!tapped!multiple!times!to!rotate!through!recently!used!frequencies!and!modes!(also!known!as!band-stacking).!
• The!GEN!CVG!(general!coverage)!button!saves!several!recently!used!VFO!frequencies/modes;!it!is!not!limited!to!ham!bands.!!!
• MEM!nnn!saves!a!few!of!the!most!recently!recalled!frequency!memories!(via!the!RCL!switch).!!
• The!XVTR!button!is!used!to!access!transverter!bands!(see!page!14).!!
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!
14!
!
!
"-#*+,&-"&-!$#*9+!
!
There!are!12!programmable!transverter!band!displays!for!use!with!external!or!internal!transverters.!With!a!K4D,!two!external!transverters!can!be!used!
simultaneously!on!receive!by!selecting!RX!ANT!1!for!one!and!XVTR!IN/RX!ANT!2!for!the!other.!External!transverters!are!driven!from!the!XVTR!OUT!jack.!
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• Before!using!a!transverter!band,!it!must!be!configured!using!the!XVTR!menu!entries.!The!first!of!these,!MENU:!XVTR!Band!#!Select,!specifies!which!
transverter!band!is!selected!for!the!remaining!XVTR!menu!entries:!I.F.,!Mode,!Offset!(to!correct!for!oscillator!errors),!Power,!and!R.F. !(low er!ban d!edge). !
• From!the!HF!band!group,!tap!XVTR!to!access!transverter!bands.!To!return!to!the!HF!bands,!tap!HF!(right-hand!yellow!arrow!below).!
• For!complete!transverter!band!setup!details,!refer!to!the!K4!Operating!Manual.!
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15!
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>'9&!+&%&)".'*!
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• Tap!the!MODE!switch!to!bring!up!the!mode!button!group.!This!group!can!also!be!displayed!by!tapping!in!the!ID/mode!icon!area!for!either!VFO.!
• Tap!a!mode!button!once!to!select!it,!and!second!time!to!select!an!alternate!mode!(e.g.,!LSB!and!USB!are!alternates,!as!are!CW!and!CW-reverse).!
• The!ALT!switch!can!also!be!held!to!select!these!alternate!modes.!
• Tap!the!dismiss!button!(with!curved!white!arrow)!to!exit!mode!selection.!
• Extended-bandwidth!SSB!(ESSB)!can!be!enabled!by!tapping!TX,!then!ESSB!ON|OFF.!
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16!
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,('!$!)'*"-'%+!
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• There!are!many!dedicated!controls!for!VFO!B/sub!receiver,!including!the!VFO!B!knob,!SUB!AF!gain,!and!touchable!icons!in!the!vicinity!of!the!VFO!B!
display.!The!RF/SQL!knob!can!also!be!set!up!to!directly!control!RF!gain!or!squelch!for!the!sub!receiver.!
• Tapping!the!B!SET!switch!(indicated!by!an!arrow!at!right)!places!additional!functions!into!their!VFO!B/sub!receiver!context.!
• The!example!below!shows!the!effect!of!a!B!SET!switch!tap,!bringing!up!the!green!“B!SET”!indicator!between!the!two!VFOs.!
• When!the!MODE!button!group!is!displayed,!as!shown!belo w,!it!now!pertain s!to !V FO !B.!VFO!B’s!mode!can!also!be!changed!by!tapping!its!mode!icon.!
• Normally!the!FILTER!knob!adjusts!the!main!receiver!passband.!In!B!SET!mode,!this!knob!targets!VFO!B/SUB!as!shown!by!its!green!selector!(arrow!at!left).!!
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17!
>5%".(5*)".'*!)'*"-'%+!
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There!are!three!multifunction!knobs!located!to!the!left!of!the!LCD.!Each!of!these!knobs!controls!a!related!group!of!functions!(see!arrows):!
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• XMTR:!!Power!output,!VOX!delay,!and!two!per-mode!parameters!(WPM!and!PITCH,!or!MIC!and!CMP).!Press!and!hold!the!knob!to!set!MONitor!level.!
• FILTER:!!Receive!filter!passband!width!(BW)!and!shift!(SHFT),!or!high-cut!(HI)!and!low-cut!(LO).!Press!and!hold!the!knob!to!NORM a lize!th e!p as sb an d.!
• RF/SQL:!!Main!receiver!RF!gain!(M.RF)!or!squelch!(M.SQL),!and!sub!receiver!RF!gain!(S.RF)!or!squelch!(S.SQL).!Press!and!hold!the!knob!to!adjust!BALance.!
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Tap!a!knob!to!alternate!between!the!associated!two!buttons!on!the!LCD.!Tapping!the!button!itself!alternates!between!one!of!its!two!functions.! !
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18!
-&)&.,&-!)'*"-'%+!#*9!.)'*+!
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In!the!image!below,!all!possible!RX!icons!are!turned!o n.!Typically!most!icons!are!off!at!a!given!time.!Arrows!identify!switches!used!to!control!the!receivers:!
!
• Tap!PRE!to!rotate!among!preamp!off/1/2!for!the!main!receiver!(or,!in!B!SET!mode,!for!the!sub!receiver).!Hold!ATTN!to!set!attenuation!in!3!dB!steps.!
• Tap!NB,!NR,!or!NTCH!to!turn!on!these!functions!with!their!last-used!settings.!Hold!these!switches!to!adjust!their!settings.!
• Tap!FIL!to!rotate!through!per-mode!passband!presets!(FL1/2/3).!Hold!APF!to!turn!the!audio!peaking!filter!on/off!(applies!only!in!CW!mode).!
• The!“K4D”!icon!(near!RIT/XIT!box)!shows!that!the!2nd!RX!(KRX4!option)!is!in!use.!This!occurs!when!the!receivers!are!on!different!bands!or!antennas.!
• The!blue!and!orange!circular!icons!to!the!left!of!the!RIT/XIT!box!(arrow)!show!DVR!receive!record!or!DVR!transmit!playback,!respectively.!
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>#.*!#*9!+5$!-&)&.,&-!)'*(.=5-#".'*!
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• Tap!MAIN!RX!or!SUB!RX!to!bring!up!a!collection!of!frequently!used!receive!configuration!controls.!Below,!MAIN!RX!has!been!selected.!
• These!buttons!are!color!coded!to!match!other!elements:!blue!for!MAIN!RX,!green!for!SUB!RX.!
• Some!configuration!controls!change!based!on!the!operating!mode.!In!this!example,!the!APF!and!TEXT!DECODE!functions!pertain!to!CW.!
!
NOTE:!You!can!customize!K4!programmable!switch!functions!to!quickly!set!up!any!combination!of!receive!functions,!such!as!bandwidth,!preamp,!RF!gain,!
AGC,!etc.!See!MACROS,!page!44.!!
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20!
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3#-#>&"&-!#9C5+">&*"+!
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• Some!parameters!are!adjusted!using!the!VFO!A!knob.!These!include!NB!LEVEL,!NR!ADJ,!ATTN,!MANUAL!notch,!and!DISPLAY!controls.!
• The!example!below!shows!manual!notch!adjustment.!VFO!A!or!the!+/-!buttons!change!the!value.!An!on/off!is!also!provided!within!the!control.!
• Exit!controls!like!this!one!by!tapping!the!dismiss!button!(curved!arrow).!
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NOTE:!You!can!customize!K4!programmable!switch!functions!to!set!the!panadapter!to!a!specific!spans,!frequencies,!etc.!See!MACROS,!page!44.!!
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21!
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-D!#*9!"D!&E!
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• The!receive!graphic!equalizer!is!displayed!by!tapping!MAIN!RX!(or!SUB!RX),!followed!by!RX!EQ.!
• EQ!values!can!be!adjusted!by!tapping!+/-!(at!the!ends!of!the!sliders),!by!moving!the!sliders,!or!by!rotating!the!VFO!A!knob.!!
• The!target!pitch!for!VFO!A!knob!adjustment!can!be!selected!by!tapping!one!of!the!Hz!buttons,!or!by!adjusting!a!slider.!
• If!FLAT!is!tapped,!all!sliders!are!centered!and!all!EQ!values!be com e !0!d B.!
• TX!EQ!is!similar,!accessed!by!tapping!the!TX!primary!function!button,!followed!by!TX!EQ.!
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22!
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"D!>&"&-.*=!
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• As!shown!below,!up!to!four!TX!bar!graphs!(in!orange:!RF!output,!SWR,!ALC,!and!CMP)!are!all!displayed!continuously!during!transmit.!(See!arrow.)!
• TX!bar!graphs!are!displayed!below!VFO!A!in!non-split,!and!under!VFO!B!in!split.!This!shift!in!position!ensures!operator!awareness!of!the!SPLIT!setting.!
• The!CMP!(compression)!meter!is!only!shown!in!voice!modes.!!
• The!status!area!(see!arrow)!shows!date!and!time!or!other!information!in!RX!mode;!during!transmit!it!shows!supply!voltage,!current,!power,!and!SWR.!
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23!
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3#*#9#3"&-!+&"".*=+!
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• To!adjust!panadapter!settings,!tap!DISPLAY!(see!arrow).!This!brings!up!a!row!of!7!buttons.!Above!these!is!another!row,!discussed!on!the!next!page.!
• In!this!example,!REF!LVL!is!selected!for!adjustment.!AUTO-reference!is!enabled,!which!automatically!positions!the!panadapter!noise!floor!at!the!baseline.!
• The!button!labeled!“PAN=A”!can!be!tapped!to!select!single!panadapter!m od e!(A !or!B ),!or!d u al!(A+ B).!Th is!is !cove red !in !a!late r!sectio n .!
• WTRFALL!sets!the!height!of!the!waterfall.!WTR!CLRS!sets!the!palette!of!colors!used!in!the!waterfall!as!signal!strength!varies.!
• NB!controls!the!panadapter!noise!blanker!function.!If!the!panadapter!NB!mo d e!is !A U TO,!it!will!be!turned!on/off!along!with!the!receiver!noise!blanker.!
• The!remaining!DISPLAY!controls!are!described!in!both!the!built-in!operating!man ua l!an d !the !K4#Owner’s#Manual.!
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24!
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9.+3%#:!#*9!3#*#9#3"&-!+&%&)".'*!
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Above!the!panadapter!settings!row!is!another!row!with!three!sets!of!controls!(see!arrows!below):!
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• The!left-hand!controls!(LCD/&/EXT)!are!used!to!specify!whether!the!target!for!parameter!adjustment!is!the!LCD,!external!monitor!(if!applicable),!or!both.!!
• The!middle!controls!(A/&/B)!select!a!panadapter!as!the!target!for!adjustment:!VFO!A/main!RX,!VFO!B/sub!RX,!or!both.!!
• The!right-hand!controls!are!used!to!adjust!the!selected!panadapter.!
• In!the!example!below,!the!target!monitor!is!the!LCD,!while !the!targe t!pan ad ap te r!is!VFO !A/m a in!RX.!!
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95#%!3#*#9#3"&-+!
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• The!panadapter!can!be!single!(A!or!B)!or!dual!(both!A!and!B)!as!shown!below.!
• The!display!can!be!customized!in!various!ways.!For!example,!the!vertical!scale!can!be!calibrated!in!S-units!or!dBm!(MENU:!Spectrum!Amplitude!Unit).!
• An!identifying!icon!(A!or!B)!appears!in!the!bottom!right-hand!corner.!
• To!select!dual-pan,!tap!DISPLAY,!then!tap!the!PAN=A!button,!which!also!has!settings!of!PAN=B!and!PAN=A+B!(dual).!
• When!dual!panadapters!are!used,!the!mouse!target!icon!shows!which!panadapter!is!selected!for!mouse-wheel!tuning.!In!the!example!below,!the!mouse!
icon!appears!on!panadapter!B,!near!its!ID!icon.!
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26!
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>.*.<3#*!"5*.*=!#.9!
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• The!mini-pan!(see!arrow)!is!a!tuning!aid!that!shows!signals!near!the!VFO!frequency.!Mini-pan!spectrum!is!resampled!at!a!narrow!bandwidth,!not!just!
magnified.!This!ensures!excellent!resolution!even!when!the!main!panadapter!is!configured!for!a!wide!span.!
• The!solid!vertical!line!indicates!the!carrier!frequency!in!CW/AM/FM/PSK!modes,!suppressed-carrier!frequency!in!SSB!mode,!and!the!mark!tone!in!FSK!
mode.!In!FSK!mode!a!dotted!line!is!added!to!indicate!the!space!tone!frequency.!
• There!are!two!ways!to!bring!up!the!mini-pan:!(1)!tap!the!S-meter!on!the!applicable!receiver,!which!keeps!the!mini-pan!displayed!until!this!area!is!tapped!
again,!or!(2)!HOLD!your!finger!or!mouse!on!a!signal!of!interest,!then!slide!it!left!or!right!to!fine-tune!using!the!mini-pan.!!
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"&D"!9&)'9&7&*)'9&!
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• Text!decode/encode!is!supported!in!CW,!PSK,!and!FSK!modes.!An!example!window!in!CW!mode!is!shown!below.!
• This!feature!is!turned!on!by!tapping!MAIN!RX!(or!SUB!RX),!followed!by!TEXT!DEC.!!
• The!upper!portion!of!the!text!window!shows!1!or!3!lines!of!received!text.!The!lower!portion!shows!one!line!of!transmitted!text,!which!can!be!entered!
with!either!a!keyboard!or!keyer!paddle.!!
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The!example!below!shows!the!flexibility!of!the!K4’s!symmetrical!user!interface,!with!both!dual!panadapters!and !dual!text!decode!selected.!The!operator!can!
send/receive!text!in!the!same!or!different!modes!on!both!VFOs.!!
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To!select!a!transmit!VFO,!the!operator!can!go!in!and!out!of!SPLIT!mode!(arrow).!
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• Tap!MENU!to!bring!up!the!menu!window.!5!entries!are!shown,!with!one!highlighted.!To!scroll,!use!the!VFO!A!knob!or!tap!the!up/down!arrows.!
• Most!menu!functions!are!locked,!as!shown,!to!prevent!unintended!changes.!Tap!the!lock!symbol!before!editing.!
• To!edit!the!parameter,!tap!the!field!to!the!right!of!the!menu!entry!name.!The!up!and!down!arrows!will!become!+/-!buttons.!
• Tap!NORM!to!restore!the!default!value.!If!the!parameter!already!matches!the!default,!NORM!will!be!highlighted.!
• For!quick!access!to!a!frequently!use!menu!entry,!locate!the!menu!entry!of!interest,!then!assign!it!to!any!of!PF1-PF4!by!holding!that!switch.!(PF1-PF4!can!
also!be!fully!customized!to!execute!any!sequence!of!K4!control!commands;!see!MACROS,!page!44.)!
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#*"&**#!+&%&)".'*!
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There!are!four!switches!to!the!left!of!the!LCD!for!antenna!selection!(see!arrow):!
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• ANT:!!Selects!the!WKVNY`XW!antenna!(ANT1/2/3!on!the!KAT4!ATU).!By!default,!both!receivers!are!configured!to!also!use!this!antenna.!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The!ANT!switch!can!be!configured!to!alternate!between!only!two!of!the!three!ATU!antennas!by!tapping!TX,!followed!by!ANT!CFG.!!
• REM!ANT:!!Reserved!for!future!use!in!setting!up!remote!antennas,!rotators,!etc.!
• RX!ANT:!!Selects!the!antenna!for!the!`VXN!KR^RXdRK!(associated!with!VFO!A).!
• SUB!ANT:!Selects!the!antenna!for!the!YMT!KR^RXdRK!(associated!with!VFO!B).!
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• There!are!separate!icons!above!the!panadapter!to!show!the!antenna!selected!for!the!main!receiver!(white,!below!the!VFO!A!S-meter),!sub!receiver!
(white,!below!the!VFO!B!S-meter),!and!transmitter!(orange,!below!the!RIT/XIT!box).!See!arrows.!
• If!an!ATU!is!available,!the!ANT!switch!(TX!antenna)!will!rotate!through!ANT1/ANT 2/ AN T 3!b y!d efa ult.!A!subset!of!2!transmit!antennas!can!be!selected!by!
tapping!TX,!then!ANT!CFG.!
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32!
-D!#*"&**#!)'*"-'%+!
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• Tapping!RX!ANT!brings!up!the!MAIN!RX!ANT!button!group,!as!shown!(at!far!left).!Holding!SUB!ANT!(on!the!same!switch)!brings!up!the!SUB!RX!ANT!
group.!
• In!this!example,!“=TX!ANT”!is!highlighted.!This!indicates!that!the!transmit!antenna!is!selected!as!the!main!receiver!antenna.!
• Names!can!be!assigned!to!antennas!by!holding!the!associated!button.!This!brings!up!the!alphanumeric!keyboard.!!
• The!orange!dot!on!the!ANT2!button!serves!as!a!reminder!that!this!is!the!antenna!presently!selected!for!transmit.!
• “=OPP!TX”!is!an!advanced!setting!useful!in!diversity!mode;!refer!to!the!K4#Owner’s#Manual.!
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-D!#*"&**#!+/.")F!)'*(.=5-#".'*!
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Normally,!tapping!the!RX!ANT!or!SUB!ANT!switches!brings!up!the!receive!antenna!button!group.!This!behavior!can!be!modified!as!follows:!!
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• Tap!MAIN!RX!as!shown!below,!then!tap!ANT!CFG.!This!brings!up!the!RX!ANT!SWITCH!configuration!control.!
• In!this!case!the!user!has!selected!“DISPLAY!ALL”! (d efault) .!
• The!other!selection!(“USE!SUBSET”)!causes!the!RX!ANT!switch!to!rotate!among!two!or!more!antennas,!without!bringing!up!the!selection!buttons.!
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+"#"5+!9.+3%#:!+&"".*=+!!
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Tapping!in!the!status!display!area!(see!arrow)!brings!up!the!controls!shown.!Tap!to!select!the!desired!receive-mode!status!display.!The!options!are:!!
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• DATE/TIME:!!Default.!Hold!the!button!to!+RW!date!and!time.!(If!the!K4!has!an!internet!connection,!date!and!time!will!be!set!automatically.)!!
• ID/TIME:!!Shows!user’s!call!sign!or!other!text!string,!along!with!time.!Hold!the!button!to!&OXW!.9!using!the!on-screen!keyboard.!
• TX!PARAM:!!Shows!supply!voltage,!current,!power,!and!SWR!(e.g.!!“13.8V!!1.8!A”!/!“100!W!!1.5:1”.!Hold!to!show!#SS!3VKV`!(V/I/Temp!for!all!modules).!
• SIG!LEVEL:!!Shows!dBV!signal!levels,!e.g.!“Main!!+3.5”!/!“Sub!-1.0”.!Hold!to!!+RW!@!O$!(reset!both!values!to!0!dB!relative!to!current!signal!level).!
• STAT/TIME:!!Shows!overall!system!status,!e.g.!(SYSTEM!OK).!Hold!to!+]L\!+WVW!(status!of!all!modules).!!
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'*<+)-&&*!G&:$'#-9!!
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An!on-screen!keyboard!appears!whenever!needed,!e.g.!to!enter!your!call!sign,!edit!a!frequency!memory!label,!etc.!Here,!a!CW!message!is!being!entered:!
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• The!shift!key!(up!arrow)!has!been!tapped,!so!QWERTY!keys!are!capitalized.!Punctuation!keys!show!their!upper!character!selected.!!
• With!CW!or!data!messages,!some!keys!are!used!to!enter!prosigns!(such!as!“BT”!and!“AR”).!EOT!inserts!an!data-mode!end-of-text!character,!which!
causes!RTTY!or!PSK!messages!to!exit!immediately!rather!than!send!4!seconds!of!idle!characters.!EOL!inserts!a!CR/LF!sequence.!!
• For!editing,!use!the!left/right!arrows!and!backspace/delete!key.!
• The!main-function!buttons!(MENU,!Fn,!DISPLAY,!etc.)!remain!accessible,!so!the!user!can!quickly!exit!a!keyboard!operation!to!respond!to!a!CQ,!etc.!
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+3&).#%!(5*)".'*+!H(NI!
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Tapping!Fn!provides!access!to!14!special!functions.!Some!are!pre-assigned!(see!below),!while!F1-F8!are!user-programmable!(see!&KKLKg!-RURKRN^R!YLMK^R!NLW!
ULMNO0,!page!44).!!
!
• SCRN!CAP!captures!both!the!LCD!and!external!monitor!contents!into!separate!files!(if!a!USB!flash!drive!is!inserted).!
• MACROS!brings!up!the!macro!editor,!which!allows!you!to!customize!PF1-PF4,!Fn.F1-F8,!REM!ANT,!and!all!K-Pod!switches.!
• SW!LIST!(tap)!shows!a!list!of!all!installed!software!revisions.!
• UPDATE!(hold)!displays!the!software!update!screen.!This!can!be!used!to!load!the!latest!software,!revert!to!an!older!revision,!etc.!
• DX!LIST!(tap)!provides!a!full!list!of!countries!and!prefixes!(see!next!page).!
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9D!3-&(.D!%.+"!!
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• In!the!example!below,!the!Fn!button!function!has!been!tapped,!followed!by!DX!LIST.!!A!small!portion!of!the!list!is!shown!here.!
• The!list!can!be!scrolled!using!the!up/down!arrow!buttons!or!the!VFO!A!knob.!
• To!search,!tap!the!magnifying!glass!icon,!then!enter!your!search!text!using!the!on-screen!keyboard.!If!more!than!one!item!matches,!the!magnifying!
glass!and!up/down!arrows!will!remain!highlighted;!navigate!among!the!matches!by!tapping!up/down.!
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• Tapping!the!SPOT!switch!(see!arrow)!in!CW!mode!turns!on!the!sidetone,!as!well!as!the!SPOT!icon!(above!the!RIT/XIT!box).!The!VFO!can!then!be!
adjusted!manually!to!match!an!on-air!signal!to!the!sidetone!pitch.!!
• Holding!the!SPOT!switch!engages!AUTO-spot.!This!automatically!moves!the!VFO!to!a!nearby!CW!signal.!!
• AUTO-SPOT!can!also!be!used!in!PSK!mode,!adjusting!the!VFO!frequency!for!optimal!text!decode.!! !
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• Tap!either!STORE!or!RCL!(see!arrows)!to!bring!up!the!frequency!memory!controls.!You!can!also!bring!up!memory!recall!by!tapping!VFO!MHz!digits.!
• Scroll!to!the!desired!memory!using!the!VFO!A!knob!(in!this!case,!memory!#036).!To!edit!the!label,!tap!its!field;!this!brings!up!the!on-screen!keyboard.!
• To!complete!the!recall!operation,!tap!the!RCL!button!(in!the!window).!This!loads!the!VFO!frequencies!and!modes!of!the!highlighted!memory.!!
• As!long!as!RCL!is!turned!on,!you!can!actively!scroll!through!memories.!Tap!this!button!to!exit!active-scroll!mode.!
• If!STORE!had!been!pressed,!the!window!w o u ld !h av e!a!S T O !b u tt o n. !T ap p in g!S T O !w o u ld !save!VFO!frequencie s!in!th e!hig hlig hte d!m emory.!
• There!are!also!four!quick!memories!per!band.!To!store!or!recall!a!quick!memory,!tap!the!STORE!or!RCL!switch,!followed!by!a!tap!of!M1!through!M4.!
!
!
! !
!
!
!
40!
.*"&-*#%!)/!G&:&-!)'*(.=5-#".'*!
!
The!internal!keyer!has!a!range!of!8!to!100!WPM.!In!FSK!and!PSK!modes,!characters!sent!with!the!internal!keyer!are!converted!to!RTTY!or!PSK31/PSK63!
signals!.!This!feature!is!most!often!used!when!the!K4’s!built-in!text!decode/encode!feature!is!turned!on.!!
!
• To!select!paddle!normal/reverse,!tap!TX,!then!PDL!NOR|REV.!
• To!select!Iambic!keying!mode!A/B,!tap!TX,!then!hold!IAMB!A|B.!
• To!change!the!keying!weight,!tap!TX,!then!tap!WEIGHT!(see!below).! !
!
!
!
!
41!
>.)-'3F'*&!)'*(.=5-#".'*!
!
The!K4!has!both!front!and!rear!microphone!inputs.!Voice-mode!audio!can!also!be!obtained!from!the!LINE!IN!jack!or!via!the!soundcard!interface!(USB-B!jack).!
!
• To!select!which!microphone!input!to!use,!tap!TX,!then!MIC!INP.!Select!FRONT,!REAR,!LINE!IN,!FRONT+LINE,!or!REAR+LINE.!
• If!the!front!or!rear!mic!has!been!selected,!it!can!be!co nf igu red !b y !tap p in g!T X !> !M IC !C F G .!You!can!turn!bias!on/off!or!select!mic!preamp!gain.!
• For!the!front!panel!mic!only,!you!can!also!specify!whether!the!mic!has!no!buttons,!PTT!button!only,!or!PTT!+!UP/DOWN!buttons!(e.g.,!Elecraft!MH4).!
• Mic!gain!(a!XMTR!knob!function)!can!be!adjusted!using!TX!TEST!mode!or!while!on!the!air.!The!target!for!the!ALC!meter!is!about!5!bars.!!! !
!
!
!
!
42!
%.*&!.*!)'*(.=5-#".'*!
!
There!are!two!possible!sources!of!transmit!audio!from!a!computer!or!other!external!device:!the!LINE!IN!jack!(analog),!or!the!digital!soundcard!interface!
(USB-B!jack).!!
!
• To!specify!which!LINE!IN!source!to!use,!tap!TX,!then!tap!LINE!IN.!This!brings!up!the!controls!shown!below.!!
• Use!the!VFO!A!knob!or!+/-!to!adjust!the!LINE!IN!level!for!the!desired!source.!
• When!transmitting!or!in!TX!TEST!mode,!adjust!LINE!IN!level!for!less!than!4!bars!of!ALC.! !
!
!
!
!
43!
%.*&!'5"!)'*(.=5-#".'*!
!
Stereo!receive!audio!at!LINE!levels!(~600!ohm!impedance)!is!always!available!at!the!LINE!OUT!jack!(analog)!as!well!as!the!(USB-B!jack;!soundcard/digital).!
Line-level!audio!can!be!used!with!external!software!applications,!for!example!in!data!modes.!%RUW!line!out!always!corresponds!to!th e!m a in!re ceiver.!-XZ]W!
line!out!will!be!the!same!as!left,!unless!the!sub!receiver!is!turned!on;!right!audio!then!corresponds!to!the!sub!receiver.!
!
• To!adjust!LINE!OUT!levels,!tap!MAIN!RX,!then!LINE!OUT!(below).!You!can!adjust!left!or!right!level!independently,!using!the!VFO!A!knob.!
• If!you!prefer!to!control!both!left!and!right!LINE!OUT!level!with!one!parameter,!tap!the!RIGHT=LEFT!button!as!shown!in!this!example.!
! !
!
!
!
!
44!
>#)-'+!
!
The!K4!and!the!Elecraft!K-Pod!controller!both!provide!numerous!user-programmable!switch!functions.!These!functions!can!execute!a!sequences!of!one!or!
more!K4!control!commands,!or!macros.!To!customize!switch!functions!on!the!K4!or!on!the!K-Pod:!
!
• Tap!Fn,!then!hold!MACROS.!This!will!bring!up!the!macro!editor!shown!below.!
• Scroll!to!the!target!switch!(Fn.F1!is!selected!here).!Tap!the!next!field!to!the!right!and!use!the!keyboard!to!create!your!custom!button!label.!
• Tap!the!next!field!to!the!right!to!enter!macro!text.!This!can!include!one!or!more!commands!as!described!in!the!K4!Programmer’s!Reference.!
• The!example!here!shows!a!macro!called!“SPLIT+10”,!which!enters!split!(FT1),!copies!all!of!VFO!A!to!VFO!B!(AB3),!and!QSYs!VFO!B!up!10!kHz.! !
!
!
45!
+3&).(.)#".'*+!
!
(KR_MRN^P!-VNZR!
RX:!!!100!kHz!-!54!MHz!
TX:!!Amateur!bands!from!1.8!to!54!MHz!
!
+RNYXWXdXWP!H>9+I!
!
(Typical!values,!+/-!3!dB;!
main!or!sub!RX,!BW!=!
500!Hz)!
!
0.1-23!MHz*:!!Preamp!OFF/1/2:!!!!-118/-128/-135!dBm!
23-54!MHz**:!!Preamp!OFF/1/2/3:!!!-118/-128/-135/-141!dBm!
*!0.1-1.5!MHz!MDS!measured!at!RX!ANT!inputs.!When!using!
RX/TX!antenna!jacks!(ANT!1-3),!sensitivity!decreases!below!
1.5!MHz!due!to!intentional!high-pass!response!of!T-R!switch.!!
**!Preamp!3!is!enabled!using!MENU:!Preamp!3!(12/10/6!m).!
(KR_MRN^P!+WVTXSXWP!!
+/-!0.3!PPM!typ.!(0-50!C).!When!locked!to!an!external!!!!!!!!!!
10!MHz!reference:!!+/-!0.05!to!0.1!PPM!typ.!
#MOXL!'MWQMW!
2.5!W!per!channel!into!4!ohms;!typ.!10%!THD!@!1!kHz,!2!W!
>LORY!
USB,!LSB,!AM,!FM,!CW,!DATA.!
Built!in!PSK,!RTTY,!and!CW!text!decode/display.!
+<>RWRK!
Nom.!S9!=!50!µV!for!all!preamp/attenuator!settings!
+MQQSP!,LSWVZR!
11!V!min,!15!V!max.!!
-(!3L\RK!'MWQMW!
1.8-54!MHz!amateur!bands:!!0.1!W!–100!W!nominal.!
Suggested!max!from!51-52!MHz,!85!W;!52-54,!70!W.!!
XVTR!OUT!(100!kHz-54!MHz):!!Up!to!5!mW!(+7!dBm).!
)MKKRNW!9KVXN!
RX:!2!–!3!A,!TX:!4!–!25!A!(typ.)!
9MWP!)P^SR! !
Up!to!10-min.!key-down!at!100!W,!25!C!ambient.!Minimum!1!
minute!cooling!period!after!10!min.!at!full!power.!
'QRKVWXNZ!"R`Q0!
0-50!C!
#"5!>VW^]XNZ!-VNZR!
10:1!on!80-10!m,!5:1!on!160!and!6!m!(typ.)!
/RXZ]W!
Approx.!10!lbs.!(4.5!kg)!
"KVNY`XW!++$!)VKKXRK!
+MQQKRYYXLN!
>!50!dB!!
+XhR!
Enclosure!only,!4.5!x!13.5!x!11.0!in.!HWD!(11.4!x!34.3!x!
28.0!cm).!With!projections,!5.2!x!14.0!x!12.5!in.!(13.2!x!35.5!
x!31.7!cm).!
"KVNY`XW!FVK`LNX^!VNO!
+QMKXLMY!'MWQMWY!
>!50!dB!(>!60!dB!on!6!meters)!
!
! !
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