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Icom IC-745 Transceiver
Manufacturer:
Model:
IC-745
Date:
unknown
Class:
Type:
SubType:
HF All Band Transceiver General Coverage Receive

Information

ALL BAND, ALL MODE, ALL SOLID-STATE The IC-745 covers all the Amateur HF frequencies from 1.8MHz to 29.700MHz, including the new three bands of 10MHz, 18MHz and 24MHz. It offers not only SSB, but also CW, AM (Receive only), FM (Option) and RTTY. All of the circuits in the IC-745, including the driver and final power stages are completely solid-state, and provide about 100 watts output. GENERAL COVERAGE Receiver CAPABILITY The IC-745 has capabilities for an all amateur band Transceiver as well as a general coverage Receiver between 100KHz and 30MHz with continuous tuning. The Up-conversion system using a high side IF and Microcomputer Control System make these capabilities possible. In addition to these, the low-pass filters and the band-pass filters are selected by an electric signal from the CPU and it makes a no tune-up system. DUAL VFO Dual VFO's controlled by a large tuning knob provide easy access to split frequencies used in DX operation. Normal tuning rate is in 10Hz increments and increasing the speed of rotation of the main tuning knob shifts the tuning to 50Hz increments automatically. Pushing the tuning speed button gives 1KHz tuning. 16 MEMORIES Sixteen tunable memories are provided to store mode, HAM/GENERAL COVERAGE mode, and frequency, and the RAM is backed up by an internal lithium memory backup battery to maintain the memories for up to seven years. Scanning of frequencies, memories and bands are possible from the unit, or from the IC-HM12 scanning microphone. Data may be transferred between VFO's, or from VFO to memories. OUTSTANDING Receiver PERFORMANCE Utilizing an Icom developed Double Balanced Mixer, the IC-745 has a 100dB dynamic range. The 70.4515MHz first IF virtually eliminates spurious responses, and a high gain 9.0115MHz second IF, with ICOM's PBT provides the ultimate in selectivity. A deep IF notch filter, adjustable AGC and noise blanker (can be adjusted to eliminate the woodpecker), audio tone control, plus RIT provide clear reception even in the presence of strong QRM or high noise levels. A low noise Receiver preamp provides exceptional reception sensitivity as required. TRANSMITTER The Transmitter features high reliability transistors in a low IMD (—38dB ~100W), full 100% duty cycle (internal cooling fan standard), 12 volt DC design. Quiet relay selection of Transmitter LPF's, transmit audio tone control, monitor circuit (to monitor your own CW or SSB signal), XIT, and a high performance speech processor enhance the IC-745 transmitter's operation. For the CW operator, optional keyer and semi break-in are provided for smooth and fast keying. OTHER FEATURES All of the above features plus full function metering, SSB and FM squelch, convenient large controls, a large selection of filters, and a high visibility flourescent display make the IC-745 your best choice for a superior grade HF base transceiver.

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Service and User Manual
Manual type:
Service and User Manual
Pages:
38
Size:
4.75 Mbytes (4983791 Bytes)
Language:
english
Revision:
Manual-ID:
A-0507
Date:
unknown
Quality:
Scanned document, all readable.
Upload date:
26 January 2014
MD5:
a622359742d31c9633f82f239202df68
Downloads:
748

Information

SECTION 1 SPECIFICATIONS ... 1 SECTION 2 FEATURES ... 2 SECTION 3 INSTALLATION ... 3 SECTION 4 OPERATING CONTROLS ... 6 4- 1 FRONT PANEL ... 6 4- 2 TOP COVER ... 9 4- 3 REAR PANEL CONNECTIONS ... 10 SECTION 5 OPERATING INSTRUCTIONS ... 11 5- 1 HOW TO TUNE ... 11 5- 2 MEMORY CHANNEL OPERATION ... 15 5- 3 TUNING BY UP/DOWN BUTTONS ON THE MICROPHONE ... 16 5- 4 SCANNING OPERATION ... *17 5-5 SSB OPERATION ... 18 5-6 CW OPERATION ... 21 5- 7 RTTY OPERATION ... 21 5-8 AM OPERATION ... 22 5- 9 FM OPERATION (OPTION) ... 22 5-10 GENERAL COVERAGE Receiver ... 23 5-11 OTHER OPERATIONS ... 23 SECTION 6 OPTION INSTALLATION ... 25 SECTION 7 INSIDE VIEWS ... 31 SECTION 8 TROUBLESHOOTING ... 33 SECTION 9 BLOCK DIAGRAM ... 34 SECTION 10 SCHEMATIC DIAGRAM ... SEPARATE

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Service Manual
Manual type:
Service Manual
Pages:
126
Size:
18.05 Mbytes (18926408 Bytes)
Language:
english
Revision:
Manual-ID:
A-0504
Date:
unknown
Quality:
Scanned document, all readable.
Upload date:
26 January 2014
MD5:
bea509ebc1e5f29657b951b380a0b054
Downloads:
842

Information

SECTION 1 SPECIFICATIONS ... 1 - 1 SECTION 2 OPERATING CONTROLS ... 2-1-5 SECTION 3 OPERATING INSTRUCTIONS ... 3- 1-15 3- 1 HOW TO TUNE ... 3- 1 3- 2 MEMORY CHANNEL OPERATION ... 3- 5 3- 3 TUNING BY UP/DOWN BUTTONS ON THE MICROPHONE. 3- 6 3- 4 SCANNING OPERATION ... 3- 7 3- 5 SSB OPERATION ... 3- 8 3 - 6 CW OPERATION ... 3-11 3- 7 RTTY OPERATION ... 3-11 3- 8 AM OPERATION ... 3-12 3- 9 FM OPERATION (OPTION).., ... 3-12 3-10 GENERAL COVERAGE Receiver ... 3-13 3-11 OTHER OPERATIONS ... 3-13 SECTION 4 CIRCUIT DESCRIPTION ... 4- 1-12 4- 1 Receiver CIRCUITS ... 4- 1 4- 2 Transmitter CIRCUITS ... 4- 3 4- 3 PLL CIRCUITS ... 4- 5 4- 4 LOGIC CIRCUITS ... 4- 8 SECTION 5 BLOCK DIAGRAM ... 5- 1 SECTION 6 INSIDE VIEWS ... 6-1-2 SECTION 7 OPTIONS INSTALLATION ... 7-1-6 SECTION 8 MECHANICAL PARTS AND DISASSEMBLY ... 8- 1-11 SECTION 9 MAINTENANCE AND ADJUSTMENT ... 9-1-6 SECTION 10 VOLTAGE (CIRCUIT) DIAGRAMS ... 10- 1-12 SECTION 11 IC RATINGS ... 11- 1- 6 SECTION 12 PARTS LIST ... 12- 1-21 SECTION 13 SCHEMATIC DIAGRAM ... 13- 1 SECTION 14 BOARD LAYOUT ... SEPARATE

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Comments

Gravatar
New
says...
Thanks, just try to repair a RAM unit an build a 9MHz CW Filter
Gravatar
New
says...
TU & 73

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