Apparecchiature informatiche

Icom IC-740 Ricetrasmittente
Produttore:
Icom
Modello: IC-740
Data:
Categoria: Radio Comunicazione
Gruppo: Ricetrasmittente
Descrizione: HF All Band Transceiver
Informazioni:
                                    ALL BAND, ALL MODE, ALL SOLID STATE

The 1C-740 covers all the Amateur HF frequencies from 1.8MHz
to 29.9999MHz, including the new three bands of 10MHz, 18MHz
and 24MHz. It offers not only SSB, but also CW and RTTY (FM
option). All of the circuits in the IC-740, including the
driver and final power stages are completely solid state,
and provide about 100 watts output.

In addition, the low-pass filters switched by the BAND
switch and the band-pass filters selected by an electronic
signal from the CPU, make a no tune-up system.

OUTSTANDING RECEIVER PERFORMANCE

The IC-740 employs the ICOM DFM (Direct Feed Mixer) system
and up-conversion system to improve a high receiver performance.

The ICOM DFM maintains a system where the incoming signals
are directly fed to the first mixer, and the mixer is a high
level Doubly Balanced Mixer developed exclusively by ICOM.

The up-conversion system uses a high side IF i.e.,
39.7315MHz and in addition high performance third over-tone
crystal filters provide excellent image and IF rejection ratio.

These advanced devices and system give higher spurious
response rejection ratio, higher sensitivity and wider
dynamic range.

PASS BAND SHIFT CONTROL

The IC-740 has a built-in Pass Band Shift system that allows
you to continuously adjust the center frequency of the IF
pass-band. By moving the control, you can eliminate
interference from a nearby signal, thus providing clear
reception. It can also be used as a tone control.

When the PBT switch is pushed in, this system acts as a
pass-band tuning system that allows you to continuously
adjust the pass-band up to 800Hz from the upper or lower
side in SSB and CW. The PBT switch provides better
performance to eliminate interference.

DUAL DIGITAL VFO WITH VARIOUS STEPS

The dual digital VFO consists of three digital
Phase-Locked-Loops which are controlled by the Microcomputer
Control System.

Three tuning frequency resolutions of 10Hz, 100Hz and 1 KHz
steps can be selected with the TUNING RATE switches.

Two separate VFO's can be used independently in the NORMAL
(NOR) operation, and any desired in-band frequencies split
transmit/receive can be used in the SPLIT (SPT) operation.

MEMORY CHANNELS

The IC-740 has a frequency memory for each band. Any in-band
frequency of the VFO A can be stored into the memory, and it
can be recalled at any time.

ADDITIONAL CIRCUITS

The IC-740 has a built-in Noise Blanker, VOX, CW Monitor,
APC, SWR detector, and many other circuits for your convenience.

The IC-740 has everything you need to really enjoy HF
operation, in an extremely compact, rugged and full featured
transceiver.

Questi manuali sono disponibili per l'attrezzatura di cui sopra:

Tipo manuale: Servizio e manuale utente Icom-9027-Manual-Page-1-Picture
Pagine: 38
Dimensioni: 3.87 Mbytes (4061711 Bytes)
Lingua: Inglese
Revisione:
Manuale-ID/numero: A-0414A
Data:
Qualità: Documento scansionato, tutto leggibile.
Data di aggiunta:
MD5: 9041866664b8501b8ac1a07078399e65
Downloads: 48 dal 14 maggio 2017
Informazioni:
1	SPECIFICATIONS..............

2	FEATURES ...................

3	INSTALLATION...............

4	OPERATING CONTROLS........

4-1 FRONT PANEL.............

4-2 TOP COVER...............

4-3	REAR PANEL CONNECTIONS

5	OPERATING INSTRUCTIONS....

5-	1 HOW TO TUNE............

5-2 SSB OPERATION...........

5-3 CW OPERATION............

5-4 RTTY OPERATION.........

5-5 FM OPERATION (OPTION)...

5-6 OTHER OPERATIONS.......

6	CIRCUIT DESCRIPTION........

7	INSIDE VIEWS................

8	OPTION INSTALLATION........

9	TROUBLESHOOTING...........

10	BLOCK DIAGRAM.............

11	SCHEMATIC DIAGRAM.........

12	BOARD LAYOUT..............
Icom-9027-Manual-Page-1-Picture


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