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tecnica

IC7100 CAT connection for remoterig

If you want to operate remotely with your PC connected to the RRC control side (RRC-CP for the rest of article), you need to add a CAT interface throught the RRC radio (RRC-R for the rest of article) and the IC7100 radio.

The most simple way, but also the most expansive $$$ one, is to buy the ICOM CT-17 C-IV interface.

The other possibility is to buy a simple CT17 (not original) CAT connector. It usually is composed by an USB plug (with some converter IC inside) and a 3.5mm jack for the radio connetion. Take care to this, infact 1) there are no USB port at the remoterig side and 2) the levels are not properly converted from/to the remoterig logic level.

So the solution is simply use a TTL-RS232 converter externally supplied. So I just buy a very pretty pcb here at Artekit Shop that it is supplied also within the enclosure (on request).

And I connected to the male 3.5mm jack directly using the RXD and the TXD pad:

  • the  TXD and RXD must be connected both to the central tip of the plug
  • and GND to the shaft of the plug

As power supply for the VCC and the GND of the board I used the 5V taken from a USB cable.

Of course the remoterig must be programmed accordly. These are the settings of RRC-CP.

COM2 mode
COM2 baudrate
COM2 data bits
COM2 stop bits
COM2 parity
COM2 terminator (hex)
Use USB Com Port as COM2

The COM2 is referred to the serial port in the remoterig device.

The last row of the options table indicates that you can connect the RRC-CP front USB port directly to your PC. On the PC you must select the corresponding COM port after installing the microbit serial driver. Usually the driver installs four virtual serial ports called RRC1258 COM0 COM1 COM2 COMEXTRA. Then simply locate the “RRC1258 COM2” to which COM on the PC is assigned and use that value.

In the program you use for control you just need to set this com port with 9600 8n1 speed (I tried it with a faster speed but it doesn’t seem so reliable and also not necessary), 88h is the default terminator code.

From the software side I tested with HRD deluxe, BBLogger, N1MM+, MTTY and some other software for digital mode without problem.

If you have any feedback, please feel free to send me.

My acknowledgement goes to Charlie KB8CR that suggested to me this approach.

Categories
tecnica

Digital Mode for IC7100 and remoterig

If you need to easily connect the PC to the remoterig and IC7100 follow the instructions below.

INSTRUCTIONS

I spent a lot of times looking for a cheap solution for connecting the frontal part of the ic7100 + remoterig to the pc in order to work with the digital mode.

My tested solution consists in using an usb external soundcard (I avoided to use the native pc soundcard but it is not forbidden) and a connector that can be directly plugged in the microphone plug of the frontal part of the IC7100.

I tried other three cheap usb devices but the results wasn’t good for all of them.  I finally bought this USB external Sound Adapter from Amazon – Sabrent ASIN: B00OJ5AV8I. I suppose that more expensive is even better (wide sound dynamic and a better S/N ratio) but as a first stage this can be a good choice.

You need also two 3.5mm audio jack (mono) and an rj45 male connector. You can also avoid to crimp the rj45 connector just using a ready ethernet cable cutting away one of the two connector and using the scheme below:

RJ45 connecotr pinout

6 —> Capacitor (4,7uF 50V) in series to protect the radio from continuous voltage —> central signal pin of the mono “OUT” jack –> Sound Board MIC IN

5 —> Ground signal “OUT” jack —> sound board MIC IN

3  —> central signal pin of the “IN” jack –> sound board  OUT (EARPHONES)

7 —-> Ground signal “IN” jack —> sound board OUT (EARPHONES)

In the radio menu you should select “MIC AF Out” item to “ON” in “Function” Set mode. (p. 17-22 of ICOM 7100 manual)

Microphone Connector Information
Function set mode

I also suggest to switch off the speaker output. Take care to do not zeroed the volume beacuse it will be used to regulate the input level to the PC.

After you should start trying to regulate properly the sound card level in the PC menu. It is different case by case.

I used the DM-780 in the Ham Radio Deluxe  without any problem. I do not test other softwares but  in theory they should work correctly.

In the next article the CAT connector for remote radio controlling trought the remoterig