Better Music Builder DX-211 Specifikace stáhnout pdf (Strana 3)

From March 2000 QST © ARRL

partially built K2 acts as a voltmeter,

ammeter, frequency counter and wattmeter!

Let’s Get Started

The K2 arrives neatly packed inside a

small cardboard box. Inside you will find

plastic bags labeled with the corresponding

circuit board names: “Control,” “Front

Panel,” “RF” and one bag with assorted

hardware labeled “Misc.” None of the

Table 1

Elecraft K2, serial number 00495

Manufacturer’s Claimed Specifications Measured in the ARRL Lab

Frequency coverage: Receive and transmit, 3.5-4; 7-7.3; Receive, 2.9-4.1, 6.5-7.3, 10-10.5, 13.2-14.7, 17.1-22;

10-10.2; 14-14.5; 18-18.2; 21-21.6; 24.8-25; 28-28.8 MHz.

1, 2

23.2-30.4 MHz; transmit, as specified.

Modes of operation: USB, LSB, CW. As specified.

Power requirement: 8.5-15 V dc, receive, 0.25 A Receive, 0.3 A (maximum volume, no signal);

(no signal); transmit, 2.0 A, at 13.8 V. transmit, 2.5 A (maximum), tested at 13.8 V.

Size (hwd): 3.4×7.9×9.9 inches; weight, 3.3 lb. With optional internal battery, 5.75 lb.

Receiver Receiver Dynamic Testing

SSB/CW sensitivity: preamp off, –130 dBm; Noise floor (MDS), 700 Hz filter:

preamp on, –135 dBm.

Preamp off Preamp on

3.5 MHz –133 dBm –137 dBm

14 MHz –131 dBm –138 dBm

Blocking dynamic range: preamp off, 133 dB; Blocking dynamic range (700-Hz IF filter):

preamp on, 125 dB.

Preamp off Preamp on

3.5 MHz 136 dB 127 dB

14 MHz 136 dB 128 dB

Two-tone, third-order IMD dynamic range: Two-tone, third-order IMD dynamic range (700-Hz IF filter):

preamp off, 96 dB; preamp on, 97 dB.

Preamp off Preamp on

3.5 MHz 100 dB 95 dB

14 MHz 97 dB 98 dB

Third-order input intercept point: Not specified.

Preamp off Preamp on

3.5 MHz +20.9 dBm +5.1 dBm

14 MHz +21.6 dBm +6.9 dBm

Second-order intercept point: preamp off and on, +70 dBm. 14 MHz, preamp off, +75 dBm; preamp on, +76 dBm.

S-meter sensitivity: Not specified. S9 signal at 14 MHz: preamp off, 115 µV; preamp on, 19 µV.

Receiver audio output: 2 W into 4 Ω, THD not specified. 2 W at 0.6% THD into 4 Ω.

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

CW-N: 625-1000 Hz (375 Hz)

CW-W: 211-1471 Hz (1260 Hz)

USB: 370-2222 Hz (1852 Hz)

LSB: 526-2000 Hz (1474 Hz)

IF rejection: Not specified. Preamp off, 89 dB.

Image rejection: Not specified. Preamp off, 74 dB.

Transmitter Transmitter Dynamic Testing

Power output: SSB, CW, 0.1-10 W. SSB, typically 1-10 W; CW, typically 0.1-12 W.

Spurious-signal and harmonic suppression: 40 dB. 44 dB. Meets FCC requirements for spectral purity.

SSB carrier suppression: 40 dB or greater. 51 dB.

Undesired sideband suppression: Not specified. >56 dB.

Third-order intermodulation distortion (IMD) products: See Figure 1.

CW keyer speed range: 9 to 50 WPM. 9 to 41 WPM.

CW keying characteristics: Not specified. See Figure 3.

Transmit-receive turnaround time (PTT release to S9 signal, 35 ms. Unit is suitable for use on AMTOR.

50% audio output): Not specified.

Receive-transmit turnaround time (“tx delay”): SSB, 23 ms.

Not specified.

Composite transmitted noise: Not specified See Figure 2.

All dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz.

Plus 1.8-2 MHz with 160-meter option.

Receive range extends beyond the transmit range but performance there is not specified.

Special settings for battery-powered operation can be engaged that reduce the receive current requirement to 153 mA.

Refer to the IF/audio response data for the actual filter bandwidth.

Filter passband ranges are adjustable (see text).

components are surface-mount. The cabinet

panels, display, speaker and main tuning

knob are wrapped in kraft paper to protect

them from scratches or other damage.

The Owner’s Manual is a 162-page

spiral-bound document. The detailed

assembly and alignment instructions are

definitely reminiscent of the legendary Heath

manuals. There is currently a short list of

manual errata, with clear instructions about

the required changes in the text. A separate

sheet lists a few important precautions.

Some builders have reported completing

their basic K2s in about 35 hours—I prefer

to work at a more relaxed pace. If you

simply stuff components on the boards and

solder them in, you will learn little about

the circuit and even less about electronics.

By locating the components on the

schematic diagram and tracing the circuit

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