ELECRAFT K3 Bedienungsanleitung PDF herunterladen

September/October 2007

NCJ

At the International DX Convention in

Visalia earlier this year, Elecraft,

www.elecraft.com, unveiled one of the

best-kept secrets in ham radio manu-

facturing history — its new K3 trans-

ceiver! Although the Elecraft faithful for

years have opined profusely on the com-

pany-sponsored e-mail reflector about

hypothetical future products, even sug-

gesting the unsurprising name “K3,” as

far as I can tell, not a word leaked out

from the company or from its in-the-

know advisors during the radio’s three

year gestation period.

Those advisors — about a dozen “fo-

cus group” members — include several

avid contesters. We made our ’druthers

very well known during the requirements

specification and design phases, and off

and on through the rest of the project.

Field input has always been important

NCJ

Reviews: The Elecraft K3

— First Impressions

Rick Tavan, N6XI

to Elecraft, and high-performance con-

testing definitely became a design point

of the nascent K3. As the radio ap-

proached production release, contesters

from the focus group were among the

most vocal and vigorous field testers.

This article describes the radio from

a contester’s perspective and presents

my initial impressions from participating

in the field test. To meet

NCJ

’s deadline,

I had to submit this review before field

testing actually ended. The QRP test

radio lacked the 100 W power amplifier,

but it drove an Alpha 87A to 250-600 W

depending on the band. The test unit

also had no sub-receiver or noise

blanker. The lack of a noise blanker pre-

sented a problem at times, but Elecraft

has promised an NB for initial-produc-

tion radios.

Many software features were in pre-

liminary form or not yet implemented, so

this is, of necessity, just a first look. In

some cases I refer to promised features

in the present tense because Elecraft

has committed to include them. Others

I explicitly note as futures. Because this

is a software-defined radio (SDR), the

performance and feature set of produc-

tion units may vary from what I report.

Check back here and elsewhere in the

coming months for updated comments

and for lab test results on production

units.

Releasing the K3 into the Amateur

Radio marketplace will not be the end

of the story. Elecraft plans a series of

new features and improvements over the

coming years, and you’ll be able to

download them to the radio in minutes

via the Internet and your PC. There is

plenty

of unused program memory, so

ANT. SW.

ANT1 ANT2

LOW-PASS

FILTERS

12 V IN

PA BYPASS

FAN

12 V

XVTR

OUT

RX ANT. IN I.F. OUT

& DRIVER

10W PA

& T-R

100W PA

ATTEN.

-10 dB

NOISE

BLANKER

CRYSTAL

FILTERS

IF AMP

RX8

TX8

CUR/TEMP

SENSE

LOW CUR

SENSE

12V CTRL

PWR ON

160-6m

BPFs

RX8

PLL

RX: POSTAMP

REF (DDS)

MAIN SYNTH

& VCO

MAIN RX IF

TX IF

SPKR-L

SPKR

AUX AF OUT

AUX AF IN

SPKR-R

AUX AF OUT

AUX.

PHONES

INT. SPKR

MIC

HEADPHONES

AUX.

MIC/AF IN

(600 )

SWR

BRIDGE

L-NET

CONTROLS

DISP.

DRVR

DISPLAY

MCU

S-MTR

SER I/O

CTRL

DATA

AUX. I/O

CTRL

AUX

DOT, DASH, KEY,

PTT IN, KEY OUT

(REAR PANEL)

KAT3

ATU

SENSE/CTRL

25 A

5 A

SELF-RESETTING

48 MHz

FUSE

8.215 MHz

+ 12 dB

RX: PREAMP

+40 dBm

+50 dBm

RX ANT. OUT

XVTR

CTRL

+17 dB

RX8RX8

TX8

RX8

KIO3

KXV3

KBPF3

0.5-28 MHz

BPFs

W. Burdick

Elecraft

E.Swartz

1 of 1

Rev. Sht. DateBy

Appendix C

FRONT PANEL

PLL

REF (DDS)

2ND SYNTH

& VCO

KRX3

SUB IF & AGC

DSP2

KDV3 DVR

2ND RCVR

12 V OUT

ALC IN

K3 Block Diagram

TX8

PC Board or Module

Functional Block

DIG.

AUDIO

F. CNTR

PA I/O

KPA3 100W PA

COMM.

DSP

15 kHz

RX8

TX8

RX8

(-5 dB)

(+10 dB)

+ 30 dB

MAIN AGC

+5 dBm

+8 dBm

6/6/07

9-46 MHz

SUB RF IN

(from splitter or KAT3)

(KREF3)

8.230 MHz

TCXO

49.380 MHz

(KREF3)

2nd LO

15 kHz

Block diagram of the K3

1 2 3 4 5 6

Inhaltsverzeichnis

Seite 1 - — First Impressions

September/October 2007NCJ © ARRL At the International DX Convention in Visalia earlier this year, Elecraft, www.elecraft.com, unveiled one of

Seite 2 - NCJ

September/October 2007NCJ © ARRL faithful were disappointed to learn that their soldering irons would sit idle dur-ing K3 assembly. Elecraft e

Seite 3

September/October 2007NCJ © ARRL ternal DSP handles all signal demodu-lation, and that, to my mind, makes it an SDR. The signal flow starts wi

Seite 4

September/October 2007NCJ © ARRL A welcome addition to the Elecraft bag of tricks is the optional second receiver. It is a full clone of the p

Seite 5

September/October 2007NCJ © ARRL CW delay are independent, solving a major problem with some other radios, especially in multi-mode events lik

Seite 6

September/October 2007NCJ © ARRL stole the show. Eager attendees lined up three and four deep for a chance to twiddle the knobs and talk to de

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ELECRAFT K3 Bedienungsanleitung

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Inhaltsverzeichnis

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