Интерфейсы для трансиверов ICOM

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Интерфейсы для трансиверов ICOM

ICOM CI-V interface to RS232 using transistors

pro: No external power needed.
con: Requires standard compliant serial port, may not work on all notebooks.

ICOM CI-V interface to RS232 using transistors, fits in DB9 case

pro: No external power needed.
pro: Very small, fits in DB9 connector case (with SMD components)
con: Requires standard compliant serial port, may not work on all notebooks.

Alexander from Russia writes:

Concernig scematic for CI-V adapter. I drew down it from real pcb so I specified part value for readable components only. They all are smd.
C1 - ceramic (looks strange but it's true),
R5 - at least 0.5W
Q1 and Q2 I guess can be any switch transistors.
I checked this adapter with CI-V Explorer software, everything's ok.

ICOM CI-V to RS232 interface using MAX232

This design is in use with all my ICOM rigs since many years, without any problems. The power comes directly from the ICOM rig, one of the AUX connectors on the rear.
Since this connector provides SQL (open, closed) information as well, i have fed this line through the MAX232 to the RS232 CTS signal and can use it in my software.

External view of homebrew interface with 4 connectors to rigs.

Internal view. Not pretty, but it works :-)

ICOM CI-V interface circuit

A sign for D-SUB 9pin connector



A design with opto isolation by Gary Dion.
He writes in May 2001:

I built one of the designs (the one by Nigel, KG7SG) and it worked great. However, being the paranoid type I decided to design my own electrically isolated version. I figure it would be preferred in a field day situation with questionable rig grounding.

The biggest challenge was powering the optos on the radio side. The 8v line coming from the 706 can source at most 10 mA (per spec). This design pulls an average of less than 0.5 mA. This voltage can be pulled from either the ACC connector or the michrophone jack. If the microphone jack is already being used, it is likely connected to an isolated audio interface. Many isolated audio interface degins already exist, so I decided not to include that on the schematic.

I love being able to find -and share- all this stuff on the web... -Gary

Icom CI-V Interface
Design by K4PWO


PC Serial Port, CI-V Interface and Radio Connections


PC 25-pin Port

PC 9-pin Port

CI-V PC Board










J2, J6

















*Power is "stolen" from the PC's DTR line.  Some PC's (mainly laptops) do
not have enough current to power the interface.  In that case, you may use a
9 volt battery or other 9 to 15 volt source with positive to pin J1 and negative
to J2 or J6.  Also, a few older PC's swapped RX and TX on their serial ports.

Design by AF4XQ.

Icom CI-V Computer Interface For Computerized Rig Control or Loggin

Note: On the miniature electrolytics, the negative lead is the shorter lead and is marked with "0" in a white band

DB9 Serial Port Connections

The DB9 serial port pin 2 is the RxD and is applied to the LTC1383 pin 14
The DB9 serial port pin 3 is the TxD and is applied to the LTC1383 pin 13
The DB9 serial port pin 5 is a common ground in the circuit

The DB9 serial port's DTR (pin 4) and RTS (pin 7) supply voltage to the input lead 1 of the 78L05 5 volt regulator. You should be able to measure +5 volts output between lead 3 (output) and lead 2 (ground) of the regulator (with a digital voltmeter!). Voltage is applied to pin 16 of the LTC1383.

Parts List



RS part #


Total cost


Linear LTC1383 5v RS232 to TTL converter IC





Ferrite Beads





22 uf 16 volt electrolytic caps





0.47 uf electrolytic capacitors





1N5818 diodes





1uH RF chokes





100pf capacitor





78L05 5 volt regulator





DB9 Female Connector

See text




1/8" miniature phone plug






What rigs will this work with?

The answer is found in your manual. If the CT-17 is listed as an option, this circuit should work. Check the back of the rig - the CT-17 interface is usually labeled "REMOTE" and requires a 1/8 inch mono phone plug. These rigs should be OK: IC-761, 765, 706, 756, 775, 781, 746, 271, 471, 275, 475, 725, 726, 728, 735, 736, 737, 970, R71, R72, R700, R7000, R7100, and R9000. Some older Icoms like the 751a required a UX14 option since they were CI-IV and not CI-V. And some rigs with digital readout like the IC-701 lack the internal microprocessor to be able to be controlled by computer.

Do I Need to do anything to my rig to set it up?

Once again, read your manual. The software will want to know the rig's CI-V Address and its baud rate. For more modern transceivers, set the menus for "Transceive Mode", and "Auto" Baud Rate. For example, on my IC-746, the address is 56h and baud rate is set to Auto. I tried all software at rates up to the maximum of 19,200 baud and the 746 recognized them all. If your older radio has a fixed baud rate, be sure to set your software to match.

What Software Can I Use?

· IC-746 software (RS-746) looks so much like a real IC-746, it is scary! It can be found at: IC746

---register for e-groups to download (if you don't mind looking at a 746 onscreen, you can even use this software to operate the IC-706 if you put in its CI-V Address). I don't believe that this software is "free", so contact Icom to register.

· Software for the IC-706, 706MkII, and 756 can be found at:

This software developed by this dedicated group of hams is FREE!

· TRX-Manager is from Laurent, F6DEX in France and offers a free (time/use limited) demo. It has the most features by far and does some logging too. Highly Recommended. Works with most Icom models:

· YP Log Program (Logging with some feature/frequency control): ~field/yplog.html

Where can I learn more about CI-V Codes and also how do I test my newly constructed interface?

As for programming the CI-V interface, Ekki DF4OR, is one of the worlds experts. He has a great site at

Lots of info and other CI-V interface circuits besides mine.

AA6YQ has developed excellent freeware called "CI-V Commander". You can verify that the LTC1383 is sending commands in both directions and that the circuit is wired correctly. In fact, anyone building the interface should try this software to verify that they built the interface properly and that their Icom's CI-V address, baudrate, etc. are set correctly:

It is also a great tool to learn about CI-V commands

Will this circuit help me do computer-based SSTV, RTTY, PSK31, ETC?

No. These modes require an interface to your soundcard, speaker and mic. See these references:

Soundcard Interfacing:



Can I hook up multiple Icom radios in parallel on the interface as with the original CT-17?

I'm not sure (untested as of yet). Each radio must have its own unique address (so if you were lucky enough to have two IC756Pros, one of them would have to have its default address changed in the setup menu). Also, one knowledgeable ham/engineer named Mario (Marijan Miletic, S56A, N1YU) has suggested a modification to my circuit to limit the current on the CI-V bus to 5 ma. He states that this will eliminate the possibility of software errors if multiple radios are connected in parallel. Here is a diagram of his suggestion. It will require 2 additional parts, so you might want to order these up front if you would like to try his suggestion:

Will this interface work with my Yaesu, Ten-Tec or Kenwood?

Some Ten-Tec's need a level converter just like the Icom's, so I have a feeling this circuit will work as-is. Yaesu splits their TTL lines into "serial in" and "serial out" - so you should be able to use separate leads from IC pins 11 and 12 (with their own chokes and 100pf caps to ground) as well as the ground connection. You would then use a 2 conductor shielded cable to the proper sized DIN plug for your model Yaesu. Pin 11 would go to "serial in", pin 12 to "serial out" and shield to ground on the Yaesu DIN plug. This has not been tested, so let me know how this works. The Kenwood is a bit more complex from what I hear. Many models use an IF10 interface in addition to a TTL/RS232 interface. You may be able to adapt my circuit to include a hex converter IC from pins 11 and 12 and power it from the same 5 volt source. Please let me know if you are successful.

Theory of Operation

The ICOM CT-17 RS232 computer level converter is both costly and requires external power. By using a cheap, readily available ultra low power TTL to RS232 converter IC, the Linear LTC1383, one can make a self-contained unit, which derives its power from the serial port itself. Although the IBM PC serial port was designed without a DC power pin, early mouse designers figured out a way to squeeze some low-current DC power from RTS or DTR lines (or from BOTH in the case of the design shown above). The LTC1383 draws only about 220uA at 5 volts - far less than most mouse circuitry. The above circuit should work with just about any serial port, including some otherwise finicky PC laptop ports. The LTC 1383 IC does all the work and requires only 4 capacitors to charge the internal pump circuits. Although one can use tiny 0.1uf non-polarized caps for the 4 charge caps, I chose some 0.47uf miniature polarized radial electrolytics to be extra sure of speedy response times in the heat of DX J . All parts are available at the time of this writing online from RadioShack.com, but might be hard to find at the retail stores. I have no affiliation to Radio Shack, but enjoy their excellent website and variety of fairly cheap parts.

I chose to use some pre-punched general purpose DIP circuit board, a 16-pin DIP socket, 4 standoffs, 2 grommets and a tiny aluminum case to wire the circuit - which would add about $6 to the cost. Anal-retentive hams can etch and drill their own circuit boards! I'm sure some industrious hams will figure out a way to package the whole circuit inside a DB9 shell!

Instead of purchasing a DB9 female connector, I pilfered the connector and cable from an old broken Microsoft™ serial mouse. I not only got a "free" DB9 connector, but I found that the 4 conductor shielded cable used by the mouse already had my 5 connections made to the right pins! I even used a couple of feet of the same cable (after cutting off the 3 unused leads) as a single conductor shielded cable to run from the aluminum box to the 1/8 inch miniature phone plug for my IC-746. One builder found that he had a short in his mouse cable, so definitely test it thoroughly before using my mouse suggestion. If the thought of harming an innocent mouse is too hard to take, buy a db9 female and plastic or metal shell.

IMPORTANT: If you want to use a DB25 serial connector instead, remember that the ground pin is 7, DTR is pin 20, RTS is pin 4, TxD is pin 2 and RxD is pin 3! This would certainly give you more room in the casing to house the circuitry if you decide to go that route.

A note about the ferrite beads. Order two of part number 900-5005. I received 2 packs of 25 beads and wasted $0.25. But others have only received 2 beads and were happy that they ordered quantity "2"! So life is like a box of chocolates. You won't know what you get till you open the Radio Shack box.

Questions, comments, photos of your creations, etc. are welcome to Этот e-mail адрес защищен от спам-ботов, для его просмотра у Вас должен быть включен Javascript . Although I built a working unit from these instructions, I make no claims or warranties about the suitability or correctness of these circuits or recommendations. I am not an engineer and I don't play one on TV. Copyright, 2000, Howard Groveman KD6UU

G3VGR Icom CI-V Interface

Icom appears to delight in charging outrageous prices for all transceiver accessories, so many Hams improvise instead. A few circuits have been published for CI-V interfaces, most of which use the MAX232 IC.  Here is a very simple CI-V interface, originally described by OK2WY.  I've made small changes to the modem control signals connections. Although the circuit doesn't conform exactly to the RS-232 specification, it does work well and has the advantage of being easily constructed inside a 9 pin D-type shell. Please note that the resistor value 4K7 means 4700 ohms.  The transistor types are not critical, I just happen to have plenty of 2N2222As.

I've used it on various PC's and a Dell Latitude Notebook with both an IC735 and IC706MkIIG. No problems have been experienced even at 19200 baud with the IC706, so I would definitely recommend this simple interface.  If a PTT function is required from the COM port, use pin 7 (RTS) to provide this function.


Here are some links to software for use with CI-V controlled Icom rigs:

CI-V Test by DF4OR

 - Freeware program to test CI-V bus

CI-V Commander by AA6YQ

 - Freeware program to control Icom rigs and monitor CI-V bus

IC706 Memory Manager by G4FEV

 - Freeware program to load IC706 memories


 - Shareware Icom Rig control and logging program

Схемы интерфейсов для управления трансивером ICOM смотрите в журналах:
  • РАДИОЛЮБИТЕЛЬ КВ и УКВ, номер 12 за 1998 год, стр.14
  • РАДИОЛЮБИТЕЛЬ КВ и УКВ, номер 4 за 2000 год, стр.14
  • РАДИО-дизайн, номер 12, стр.38
  • CQDL, номер 1 за 2000 год, стр.27
  • CQDL, номер 1 за 2001 год, стр.37
Игорь Лаврушов, UA6HJQ

Я собрал еще более простой интерфейс, так как мне не нужно было принимать информацию из трансивера в виде параметров в программу. Для управления трансивером используется программа ICOM-QSY.RAR.

Глас народа 27.08.2007 13:24 ...  -- 

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