Alinco DX-77T Información técnica descargar pdf (Pagina 2)

ondary functions. The top button in this row

serves as a function button, allowing ac-

cess to the secondary functions and the set

mode. The lower three buttons control vari-

ous memory, VFO and scan features.

There’s a second set of six buttons in two

horizontal rows to the right of the main

tuning knob. The top row contains single

function buttons for

SELECT, MODE, and

TUNE (for use with an external automatic

Table 1

Alinco DX-77T, serial number T000528

Manufacturer’s Claimed Specifications Measured in the ARRL Lab

Frequency coverage: Receive, 0.5 to 30 MHz; As specified.

transmit, 1.8-2, 3.5-4, 7-7.3, 10.1-10.15,

14-14.35, 18.068-18.168, 21-21.45,

24.89-24.99; 28-29.7 MHz.

Size (height, width, depth): 3.9×9.7×10.5 inches; weight, 8.4 pounds.

Power requirement: Receive, 1.1 A (max); transmit, 20 A (max). Receive, 0.8 A; transmit, 16 A. Tested at 13.8 V.

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

Receiver Receiver Dynamic Testing

SSB/CW sensitivity, bandwidth not specified: 0.5-1.8 MHz, –107 dBm; Minimum discernible signal (noise floor), 500 Hz filter:

1.8-30 MHz, –119 dBm.

Preamp off Preamp on

1.0 MHz –127 dBm –129 dBm

3.5 MHz –132 dBm –140 dBm

14 MHz –130 dBm –136 dBm

AM sensitivity, 10 dB S/N: 0.5-1.8 MHz, 10 µV; 1.8-30 MHz, 2 µV. 10 dB (S+N)/N, 1-kHz tone, 30ﬁ modulation:

Preamp off Preamp on

1.0 MHz 3.2 µV 1.9 µV

3.8 MHz 1.4 µV 0.6 µV

FM sensitivity, 12 dB SINAD: 0.5 µV. For 12 dB SINAD:

Preamp off Preamp on

29 MHz 0.7 µV 0.2 µV

Blocking dynamic range: Not specified. Blocking dynamic range, 500 Hz filter:

Preamp off Preamp on

3.5 MHz 109 dB* 110 dB*

14 MHz 111 dB* 112 dB*

Two-tone, third-order IMD dynamic range: Not specified. Two-tone, third-order IMD dynamic range, 500 Hz filter:

Preamp off Preamp on

3.5 MHz 92 dB* 93 dB*

14 MHz 94 dB* 95 dB*

Third-order intercept: Not specified.

Preamp off Preamp on

†

3.5 MHz +12.6 dBm +4.5 dBm

14 MHz +17.3 dBm +9.5 dBm

Second-order intercept: Not specified. Preamp off, +53 dBm; preamp on, +51.5 dBm.

FM adjacent channel rejection: Not specified. 29 MHz: 60 dB, at 20 kHz channel spacing, preamp on.

FM two-tone, third-order IMD dynamic range: Not specified. 29 MHz: 63 dB* at 20 kHz channel spacing, preamp on.

S-meter sensitivity: Not specified. S9 signal at 14.2 MHz: preamp off, 36 µV; preamp on, 16 µV.

Squelch sensitivity: Not specified. At threshold, preamp on: SSB, 14 MHz, 1.0 µV; FM, 29 MHz, 0.1 µV.

Receiver audio output: 2 W at 10% THD into 8 Ω. 2.1 W at 10% THD into 8 Ω.

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

CW-N (500 Hz filter): 525-1027 Hz (500 Hz);

CW-W: 150- 2288 Hz (2138 Hz);

USB-W: 216-2977 Hz (2761 Hz);

LSB-W: 186-2834 Hz (2648 Hz);

AM: 146-2894 Hz (2748 Hz).

Spurious and image rejection: 70 dB. First IF rejection, 114 dB; image rejection, 104 dB.

Transmitter Transmitter Dynamic Testing

Power output: SSB, CW, FM: 100 W high, ≈10 W low; CW, SSB, FM, typically 106 W high,

AM, 40 W high, ≈4 W low. 11 W low; AM, typically 42 W high, 6 W low.

Spurious-signal and harmonic suppression: 50 dB (45 dB on 30 M). 52 dB. Meets FCC requirements for spectral purity for equipment in its

power output class and frequency range.

SSB carrier suppression: 40 dB. As specified.

Undesired sideband suppression: 50 dB. As specified. >60 dB.

Third-order intermodulation distortion (IMD) products: Not specified. See Figure 1.

CW keyer speed range: Not specified. 6 to 49 WPM.

CW keying characteristics: Not specified. See Figure 2.

Transmit-receive turn-around time (PTT release S9 signal, 19 ms.

to 50 % audio output): Not specified.

Receive-transmit turn-around time (tx delay): Not specified. SSB, 20 ms; FM, 8 ms. Unit is suitable for use on AMTOR.

Composite transmitted noise: Not specified. See Figure 3.

Note: Unless otherwise noted, all dynamic range measurements are taken at the ARRL Lab standard spacing of 20 kHz

∗Measurement was noise-limited at the value indicated.

†

Third-order intercept was determined using S5 reference.

tuner). The second row are dual function

buttons:

RF/FILTER for RF gain level and

CW filter,

NB/AGC for noise blanker and

automatic gain control fast or slow and

H/L/TONE for power output level and

CTCSS tone. All ten buttons also provide

access to set mode controls, including the

speech processor, display brightness, auto-

matic LSB/USB selection, transmit inhibit,

the step size of the

UP/DOWN buttons, and

several additional settings related to CW

keyer and scan operations. A one page

“Controls Quick Reference” table in the

manual gives a description of the functions

performed by each of these ten buttons in

their primary, secondary and set mode ap-

plications. New users will definitely want

to photocopy this chart and keep it handy.

The only part about using this radio that

can be confusing—at least at first—is that

June 1998 53

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