ELECRAFT KPA3 Dokumentacja Pobierz pdf (Strona 3)

From January 2009 QST © ARRL

Table 1

Elecraft K3, serial number 1915

Manufacturer’s Speciﬁcations Measured in the ARRL Lab

Frequency coverage: Receive, 0.5-30, Receive and transmit, as speciﬁed.*

48-54 MHz; transmit, 1.8-2, 3.5-4, 5.33-5.40,

7-7.3, 10.1-10.15, 14-14.35,18.068-18.168,

21-21.45, 24.89-24.99, 28-29.7, 50-54 MHz.

Power requirement: 11-15 V dc; transmit, As speciﬁed. Operation conﬁrmed

17-22 A; receive, 0.9 A (without subreceiver). at 11 V.

Modes of operation: SSB, CW, AM, FM, FSK, As speciﬁed.

AFSK, PSK, data.

Receiver Receiver Dynamic Testing

SSB/CW sensitivity, 500 Hz bandwidth: Noise Floor (MDS), 400 Hz bandwidth:**

–136 dBm (typical), preamp on. Preamp Off Preamp On

1.0 MHz –111 dBm –119 dBm

3.5 MHz –131 dBm –138 dBm

14 MHz –130 dBm –138 dBm

50 MHz –130 dBm –136 dBm

Noise ﬁgure: Not speciﬁed. 14 MHz, preamp off/on: 12/9 dB.

AM sensitivity, 6 kHz bandwidth, 10 dB S/N: 10 dB (S+N)/N, 1 kHz, 30% modulation:

Not speciﬁed. Preamp Off Preamp On

1.0 MHz 15.6 µV 10.6 µV

3.8 MHz 1.6 µV 0.9 µV

50 MHz 2.1 µV 1.6 µV

FM sensitivity, 12 dB SINAD: Not speciﬁed. For 12 dB SINAD:

Preamp Off Preamp On

29 MHz 0.55 µV 0.40 µV

52 MHz 0.62 µV 0.44 µV

Blocking gain compression: 140 dB typical Gain compression, 400 Hz bandwidth:**

at 2, 5 and 20 kHz spacing with 400 Hz, 20 kHz Offset 5/2 kHz offset

8 pole rooﬁng ﬁlter. Preamp Off/On Preamp Off

3.5 MHz 142/137 dB 140/139 dB

14 MHz 142/138 dB 140/140 dB

50 MHz 140/138 dB 128/124 dB

Reciprocal Mixing (500 Hz BW): Not speciﬁed. 20/5/2 kHz offset: –112/–100/–86 dBc.

ARRL Lab Two-Tone IMD Testing**

Measured Measured Calculated

Band/Preamp Spacing Input Level IMD Level IMD DR IP3

3.5 MHz/Off 20 kHz –23 dBm –131 dBm 108 dB +31 dBm

–14 dBm –97 dBm +28 dBm

0 dBm –60 dBm +30 dBm

14 MHz/Off 20 kHz –24 dBm –130 dBm 106 dB +29 dBm

–13 dBm –97 dBm +29 dBm

0 dBm –60 dBm +30 dBm

14 MHz/On 20 kHz –35 dBm –138 dBm 103 dB +17 dBm

–21 dBm –97 dBm +17 dBm

14 MHz/Off 5 kHz –25 dBm –130 dBm 105 dB +28 dBm

–14 dBm –97 dBm +29 dBm

0 dBm –59 dBm +30 dBm

14 MHz/Off 2 kHz –27 dBm –130 dBm 103 dB +25 dBm

–14 dBm –97 dBm +28 dBm

0 dBm –59 dBm +30 dBm

50 MHz/Off 20 kHz –26 dBm –131 dBm 105 dB +27 dBm

–11 dBm –97 dBm +32 dBm

Second-order intercept: Not speciﬁed. Preamp off/on: +75/+75 dBm.**

a size about the same as the compact entry

level radios from other manufacturers, this

radio includes many features found in the

largest and most expensive radios on today’s

market. Its performance is comparable or

superior in most respects as well. On the

other hand, there just aren’t as many knobs

and switches on the front of this radio as its

larger brethren. Elecraft uses each button for

at least two functions. The one shown on the

button happens with a quick tap. A second-

ary, often related, function, shown below the

button, is enabled with a longer,

⁄2 second

or more, push. It doesn’t take long to get the

fingers programmed. The buttons and knobs

are organized into groups by function, and I

had no problem getting to know them.

While size and weight are of particular

importance to those who want to take the

radio with them as they travel, or who operate

in close quarters, front panel space is limited.

Controls are somewhat smaller and closer

together than on some larger radios, although

I found them all accessible and easy to use.

Perhaps the display provides the big-

gest difference. The K3 includes a two-line

monochrome LCD that shows all critical op-

erating information. It doesn’t offer the bells

and whistles of the “big boys,” particularly

a spectrum analyzer — perhaps expected at

the upper end of the K3 price range. An IF

OUTPUT jack is provided (as part of the op-

tional KXV3 transverter module) so that an

external spectrum scope can be supported. At

least one manufacturer provides a very com-

petent one that works with a PC and provides

“point-and-drag,” frequency selection.

Thus, with an added spectrum scope for

home station operation, the combination of

displays can rival top-end transceivers. At

the same time the basic radio remains ready

for the campground or emergency operations

center. For some, this will be the best of

all worlds. Those who don’t travel or don’t

need the compact footprint may wish it were

somewhat larger.

How’s it Play?

In a word, this is one fine radio. I was so

impressed with its published performance

that I will happily confess to having pur-

chased a 100 W kit version for myself. I don’t

think that makes me biased, since I’ve had

much more cockpit time to get to know the

K3, for better or worse, than most equipment

I’ve reviewed over the years. The ARRL Lab

measurements were taken with a current

production radio. We’ve also spent quite a

bit of time using an early production K3/100

that’s been upgraded as accessories and new

firmware have become available.

It’s Got Features

The K3 does almost anything you can

imagine, and some things we didn’t imagine

until we saw them! The latter category most

notably includes the way it can operate popu-

lar digital modes in a stand-alone fashion.

It decodes RTTY, PSK31 and even CW

on the display, as do a few other high-end

transceivers — but the K3 also can send in

these modes by internal translation from

Morse using keyer paddles. Remarkable

indeed!

While it seems like a gimmick, it can be

helpful — as when you see a rare station

running RTTY posted on the DX cluster and

you’re operating portable or don’t have your

station set up for RTTY. The short display

space might be a limit for a rag chew, but

not for a DX contact. I’ve actually made such

contacts. The K3 Utility Program, required

LP-PAN software deﬁned IQ direct conversion

panadapter for the K3. Available as a kit or

fully assembled from Larry Phipps, N8LP, at

www.telepostinc.com.

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