ELECRAFT KPA3 Dokumentacja Pobierz pdf (Strona 4)

From January 2009 QST © ARRL

Table 1

Elecraft K3, serial number 1915

Receiver Receiver Dynamic Testing

FM adjacent channel rejection: Not speciﬁed. 20 kHz offset, preamp on: 29 MHz,

79 dB; 52 MHz, 79 dB.

FM two-tone, third-order IMD dynamic range: 20 kHz offset, preamp on:

Not speciﬁed. 29 MHz, 86 dB

†

; 52 MHz, 86 dB.

†

10 MHz spacing: 52 MHz, 104 dB.

S-meter sensitivity: S9 = 50µV, user-adjustable. 14.2 MHz: preamp off, 50 µV;

preamp on, 13.5 µV.

Squelch sensitivity: Not speciﬁed. At threshold, FM, 29 MHz, 0.2 µV;

52 MHz, 0.3 µV.

Receiver audio output: 2.0 W into 4 Ω 2.1 W at 10% THD into 4 Ω.

at 10% THD.

IF/audio response: Not speciﬁed. Range at –6 dB points, (bandwidth):

††

CW (400 Hz): 459-800 Hz (341 Hz);

‡

Equivalent Rectangular BW: 416 Hz;

USB: 211-2750 Hz (2539 Hz);

LSB: 292-2820 Hz (2528 Hz);

AM: 113-2890 Hz (2777 Hz).

Spurious and image rejection: >70 dB First IF rejection, 14 MHz, 105 dB;

50 MHz, 111 dB; image rejection,

14 MHz, 88 dB; 50 MHz, 72 dB.

Transmitter Transmitter Dynamic Testing

Power output: HF & 50 MHz: SSB, CW, FM, HF: CW, SSB, FM, adjustable, 0 to

100 W, reduced power on AM. typically 116 W AM, 0 to 51 W.

Spurious-signal and harmonic suppression: MF, 48 dB; HF, 52 dB; 50 MHz, 66 dB.

>50 dB on HF, >60 dB on 50 MHz. Meets FCC requirements.

SSB carrier suppression: >50 dB. >70 dB.

Undesired sideband suppression: Not speciﬁed. >70 dB.

Third-order intermodulation distortion (IMD) 3rd/5th/7th/9th order (worst case band):

products: Not speciﬁed. HF, –29/–43/–46/–51 dB PEP;

50 MHz, –25/–41/–51/–51 dB PEP.

CW keyer speed range: Not speciﬁed. 8 to 46 WPM.

CW keying characteristics: Not speciﬁed. See Figures 1 and 2.

Transmit-receive turnaround time (PTT release S9 signal, 25 ms.

to 50% audio output): Not speciﬁed.

Receive-transmit turnaround time (tx delay): SSB, 12 ms; FM, 9 ms. Unit is

Not speciﬁed. suitable for use on AMTOR.

Composite transmitted noise: Not speciﬁed. See Figure 3.

Size (height, width, depth): 4.4 × 11.1 × 11.8 inches; weight 9.4 pounds.

Third-order intercept points were determined using S5 reference.

Price: (assembled) K3/100, $2089.95; KAT3 internal antenna tuner, $329.95; KRX3

subreceiver, $599.95; KBPF3 general coverage RX band-pass ﬁlter, $129.95; KXV3

RX antenna I/O and transverter interface, $99.95; KTCXO3-1 high stability oscillator,

$99.95; 5 pole ﬁlters (200, 500 Hz), $99.95 each; 8 pole ﬁlters (250, 400 Hz; 1, 1.8, 2.1,

2.8, 6, 13 kHz), $125.95 each.

*Reduced sensitivity around the 8.215 MHz IF. The optional KBPF3 band-pass ﬁlter is

required for full general coverage receive performance.

**Receiver testing was performed with the optional 400 Hz, 8-pole rooﬁng ﬁlter for optimum

performance unless otherwise speciﬁed. Two-Tone, 3rd-Order IMD Dynamic Range

ﬁgures comparable to previous reviews are shown on the ﬁrst line in each group.

The “IP3” column is the calculated Third-Order Intercept Point. Second-order intercept

points were determined using a –97 dBm reference.

†

Measurement was noise-limited at the value indicated.

††

Default values; bandwidth and cutoff frequencies are adjustable via DSP.

‡

Varies with PBT and pitch control settings.

for downloading operating software, and

available from the Elecraft Web site, can

also be used to display a continuous stream-

ing page of text from the internal decoder if

you’re connected to a PC.

This radio provides a large number of

interesting features, all described in the down-

loadable 78 page Operator’s Manual. We will

hit what we see as the high spots and let those

who want to know more go to the source.

Features for Everyone

Some features are there for all modes. The

combination of roofing filters (2.7 kHz stan-

dard, room for four more in each receiver)

and DSP bandwidth filters are seamlessly

adjustable in each mode. Just turn the WIDTH

control and set the SHIFT where you want

it and you get exactly the bandwidth you

need — from the widest roofing filter width

down to an amazing non-ringing 50 Hz that

Figure 1 — CW keying waveform for the

K3/100 showing the ﬁrst two dits in full-

break-in (QSK) mode using external keying.

Equivalent keying speed is 60 WPM. The

upper trace is the actual key closure; the

lower trace is the RF envelope. (Note that

the ﬁrst key closure starts at the left edge

of the ﬁgure.) Horizontal divisions are

10 ms. The transceiver was being operated

at 100 W output on the 14 MHz band.

Figure 2 — Spectral display of the K3/100

transmitter during keying sideband testing.

Equivalent keying speed is 60 WPM using

external keying. Spectrum analyzer

resolution bandwidth is 10 Hz, and the

sweep time is 30 seconds. The transmitter

was being operated at 100 W PEP output

on the 14 MHz band, and this plot shows

the transmitter output ±5 kHz from the

carrier. The reference level is 0 dBc, and

the vertical scale is in dB.

Figure 3 — Spectral display of the K3/100

transmitter output during composite-noise

testing. Power output is 100 W on the

14 MHz band. The carrier, off the left edge

of the plot, is not shown. This plot shows

composite transmitted noise 100 Hz to

1 MHz from the carrier. The reference level

is 0 dBc, and the vertical scale is in dB.

-180

-160

-140

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-60

-40

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0.080.00.010.020.030.040.050.060.07

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kHz

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