ELECRAFT KPA3 Dokumentacja Pobierz pdf (Strona 2)

From January 2009 QST © ARRL

PRODUCT REVIEW

Mark J. Wilson, K1RO



Product Review Editor



[email protected]

Bottom Line

Key Measurements

Summary

Reviewed by Joel R. Hallas, W1ZR

Technical Editor, QST

The Elecraft K3 is a modular and ex-

pandable transceiver that can be set up to

fill a number of roles. In our first look, we

described a configuration at the bottom of the

K3 spectrum — a 10 W minimally equipped

kit version of the transceiver.

At that time,

many of the announced options were not yet

available. This time, we have waited until

almost all of the bells and whistles have been

installed and configured.

So What’s in This Little Box?

In addition to the pieces included for the

earlier review, this version has the following

hardware as well as the benefit of multiple

firmware revisions:

An internal power amplifier module

(KPA3) that makes the K3 into a nominal

100 W output transceiver on 160 through

6 meters.

A second receiver (KRX3), identical in

performance to the first, that fits in the same

box. Two audio channels are provided so one

receiver can be heard in each ear or speaker, or

they can be mixed. In split mode, one receiver

can track a DX station’s receive frequency

and control the transmit frequency, while the

other is listening to his transmission. The two

receiver VFOs can be locked together to pro-

vide diversity reception to avoid fading. This

works if you have two separated antennas or

antennas of different polarization.

A transverter interface (KXV3) that

also provides a connection for a receive-only

antenna and an IF output for a spectrum

scope.

An automatic antenna tuner (KAT3)

specified to match antenna loads with an

SWR up to 10:1. The KAT3 also provides a

switchable second antenna connection.

General coverage receiver front end

ban

d-pass filter (KBPF3), AM, SSB, CW

and FM roofing filters (see text) and the

KTCXO3-1 temperature controlled fre-

quency reference that provides stability of

better than ±1 ppm over the operating tem-

perature range.

The only announced options that weren’t

yet available for testing were the digital voice

recorder (KDVR3) and the low noise 6 meter

receive preamp (PR-6).

The resulting radio looks the same as the

K3/10 from the front, but it weighs a tad more

and the rear panel has quite a few more connec-

tors. As you might expect, the options result in

a significant increase in the total cost. While

the base 10 W kit costs $1400 at this writing,

our fully assembled and tested radio is about

$4000 ($3350 for the radio and modules, plus

$600 for five optional roofing filters).

A nice feature of the K3 architecture is that

it doesn’t have to be purchased all at once, nor

are all options required to have a fully func-

tional competitive transceiver — build it your

way. Start with as much of a chunk as you’re

comfortable with and then add pieces over

time. It also makes filling out holiday wish lists

an easy chore, possibly for years to come!

Does Size Matter?

We should emphasize that this is indeed

a compact and, at just a few pounds more

than the K3/10, still a light transceiver. At

Elecraft K3/100 HF and

6 Meter Transceiver

B. Prior, N7RR, “First Look: Elecraft K3 HF/6

Meter Transceiver,” Product Review, QST,

Apr 2008, pp 41-45. QST Product reviews

are

available on the Web at

www.arrl.org/

members-only/prodrev/.

The K3, in any of the available

configurations, provides a high per-

formance, modular and expandable

transceiver that can fill the needs of

almost anyone looking for an HF and

6 meter transceiver for home station

or portable use.

pr036

80 M

20 M

Dynamic range and intercept

values with preamp off.

Intercept values were determined

using -97 dBm reference

Key:

† Off Scale

-20

-70

Transmit 9th-order IMD (dB)

-51

-20

-35

Transmit 3rd-Order IMD (dB)

-29

-40 +35

2 kHz 3rd-Order Intercept (dBm)

-40

20 kHz 3rd-Order Intercept (dBm)

+35

110

2 kHz 3rd-Order Dynamic Range (dB)

103

110

106

108

20 kHz 3rd-Order Dynamic Range (dB)

140

139

2 kHz Blocking Gain Compression (dB)

140

142

†

142

†

20 kHz Blocking Gain Compression (dB)

1 2 3 4 5 6 7 8 9

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